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CVE-2024-53171 (GCVE-0-2024-53171)

Vulnerability from cvelistv5 – Published: 2024-12-27 13:49 – Updated: 2026-08-05 11:44
VLAI
Title
ubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit
Summary
In the Linux kernel, the following vulnerability has been resolved: ubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit After an insertion in TNC, the tree might split and cause a node to change its `znode->parent`. A further deletion of other nodes in the tree (which also could free the nodes), the aforementioned node's `znode->cparent` could still point to a freed node. This `znode->cparent` may not be updated when getting nodes to commit in `ubifs_tnc_start_commit()`. This could then trigger a use-after-free when accessing the `znode->cparent` in `write_index()` in `ubifs_tnc_end_commit()`. This can be triggered by running rm -f /etc/test-file.bin dd if=/dev/urandom of=/etc/test-file.bin bs=1M count=60 conv=fsync in a loop, and with `CONFIG_UBIFS_FS_AUTHENTICATION`. KASAN then reports: BUG: KASAN: use-after-free in ubifs_tnc_end_commit+0xa5c/0x1950 Write of size 32 at addr ffffff800a3af86c by task ubifs_bgt0_20/153 Call trace: dump_backtrace+0x0/0x340 show_stack+0x18/0x24 dump_stack_lvl+0x9c/0xbc print_address_description.constprop.0+0x74/0x2b0 kasan_report+0x1d8/0x1f0 kasan_check_range+0xf8/0x1a0 memcpy+0x84/0xf4 ubifs_tnc_end_commit+0xa5c/0x1950 do_commit+0x4e0/0x1340 ubifs_bg_thread+0x234/0x2e0 kthread+0x36c/0x410 ret_from_fork+0x10/0x20 Allocated by task 401: kasan_save_stack+0x38/0x70 __kasan_kmalloc+0x8c/0xd0 __kmalloc+0x34c/0x5bc tnc_insert+0x140/0x16a4 ubifs_tnc_add+0x370/0x52c ubifs_jnl_write_data+0x5d8/0x870 do_writepage+0x36c/0x510 ubifs_writepage+0x190/0x4dc __writepage+0x58/0x154 write_cache_pages+0x394/0x830 do_writepages+0x1f0/0x5b0 filemap_fdatawrite_wbc+0x170/0x25c file_write_and_wait_range+0x140/0x190 ubifs_fsync+0xe8/0x290 vfs_fsync_range+0xc0/0x1e4 do_fsync+0x40/0x90 __arm64_sys_fsync+0x34/0x50 invoke_syscall.constprop.0+0xa8/0x260 do_el0_svc+0xc8/0x1f0 el0_svc+0x34/0x70 el0t_64_sync_handler+0x108/0x114 el0t_64_sync+0x1a4/0x1a8 Freed by task 403: kasan_save_stack+0x38/0x70 kasan_set_track+0x28/0x40 kasan_set_free_info+0x28/0x4c __kasan_slab_free+0xd4/0x13c kfree+0xc4/0x3a0 tnc_delete+0x3f4/0xe40 ubifs_tnc_remove_range+0x368/0x73c ubifs_tnc_remove_ino+0x29c/0x2e0 ubifs_jnl_delete_inode+0x150/0x260 ubifs_evict_inode+0x1d4/0x2e4 evict+0x1c8/0x450 iput+0x2a0/0x3c4 do_unlinkat+0x2cc/0x490 __arm64_sys_unlinkat+0x90/0x100 invoke_syscall.constprop.0+0xa8/0x260 do_el0_svc+0xc8/0x1f0 el0_svc+0x34/0x70 el0t_64_sync_handler+0x108/0x114 el0t_64_sync+0x1a4/0x1a8 The offending `memcpy()` in `ubifs_copy_hash()` has a use-after-free when a node becomes root in TNC but still has a `cparent` to an already freed node. More specifically, consider the following TNC: zroot / / zp1 / / zn Inserting a new node `zn_new` with a key smaller then `zn` will trigger a split in `tnc_insert()` if `zp1` is full: zroot / \ / \ zp1 zp2 / \ / \ zn_new zn `zn->parent` has now been moved to `zp2`, *but* `zn->cparent` still points to `zp1`. Now, consider a removal of all the nodes _except_ `zn`. Just when `tnc_delete()` is about to delete `zroot` and `zp2`: zroot \ \ zp2 \ \ zn `zroot` and `zp2` get freed and the tree collapses: zn `zn` now becomes the new `zroot`. `get_znodes_to_commit()` will now only find `zn`, the new `zroot`, and `write_index()` will check its `znode->cparent` that wrongly points to the already freed `zp1`. `ubifs_copy_hash()` thus gets wrongly called with `znode->cparent->zbranch[znode->iip].hash` that triggers the use-after-free! Fix this by explicitly setting `znode->cparent` to `NULL` in `get_znodes_to_commit()` for the root node. The search for the dirty nodes ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-11 15:43 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 16a26b20d2afd0cf063816725b45b12e78d5bb31 , < daac4aa1825de0dbc1a6eede2fa7f9fc53f14223 (git)
Affected: 16a26b20d2afd0cf063816725b45b12e78d5bb31 , < 8d8b3f5f4cbfbf6cb0ea4a4d5dc296872b4151eb (git)
Affected: 16a26b20d2afd0cf063816725b45b12e78d5bb31 , < 4d9807048b851d7a58d5bd089c16254af896e4df (git)
Affected: 16a26b20d2afd0cf063816725b45b12e78d5bb31 , < 74981f7577d183acad1cd58f74c10d263711a215 (git)
Affected: 16a26b20d2afd0cf063816725b45b12e78d5bb31 , < 01d3a2293d7e4edfff96618c15727db7e51f11b6 (git)
Affected: 16a26b20d2afd0cf063816725b45b12e78d5bb31 , < 398a91599d263e41c5f95a2fd4ebdb6280b5c6c3 (git)
Affected: 16a26b20d2afd0cf063816725b45b12e78d5bb31 , < 2497479aecebe869d23a0064e0fd1a03e34f0e2a (git)
Affected: 16a26b20d2afd0cf063816725b45b12e78d5bb31 , < 4617fb8fc15effe8eda4dd898d4e33eb537a7140 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.11.11 , ≤ 6.11.* (semver)
Unaffected: 6.12.2 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit\n\nAfter an insertion in TNC, the tree might split and cause a node to\nchange its `znode-\u003eparent`. A further deletion of other nodes in the\ntree (which also could free the nodes), the aforementioned node\u0027s\n`znode-\u003ecparent` could still point to a freed node. This\n`znode-\u003ecparent` may not be updated when getting nodes to commit in\n`ubifs_tnc_start_commit()`. This could then trigger a use-after-free\nwhen accessing the `znode-\u003ecparent` in `write_index()` in\n`ubifs_tnc_end_commit()`.\n\nThis can be triggered by running\n\n  rm -f /etc/test-file.bin\n  dd if=/dev/urandom of=/etc/test-file.bin bs=1M count=60 conv=fsync\n\nin a loop, and with `CONFIG_UBIFS_FS_AUTHENTICATION`. KASAN then\nreports:\n\n  BUG: KASAN: use-after-free in ubifs_tnc_end_commit+0xa5c/0x1950\n  Write of size 32 at addr ffffff800a3af86c by task ubifs_bgt0_20/153\n\n  Call trace:\n   dump_backtrace+0x0/0x340\n   show_stack+0x18/0x24\n   dump_stack_lvl+0x9c/0xbc\n   print_address_description.constprop.0+0x74/0x2b0\n   kasan_report+0x1d8/0x1f0\n   kasan_check_range+0xf8/0x1a0\n   memcpy+0x84/0xf4\n   ubifs_tnc_end_commit+0xa5c/0x1950\n   do_commit+0x4e0/0x1340\n   ubifs_bg_thread+0x234/0x2e0\n   kthread+0x36c/0x410\n   ret_from_fork+0x10/0x20\n\n  Allocated by task 401:\n   kasan_save_stack+0x38/0x70\n   __kasan_kmalloc+0x8c/0xd0\n   __kmalloc+0x34c/0x5bc\n   tnc_insert+0x140/0x16a4\n   ubifs_tnc_add+0x370/0x52c\n   ubifs_jnl_write_data+0x5d8/0x870\n   do_writepage+0x36c/0x510\n   ubifs_writepage+0x190/0x4dc\n   __writepage+0x58/0x154\n   write_cache_pages+0x394/0x830\n   do_writepages+0x1f0/0x5b0\n   filemap_fdatawrite_wbc+0x170/0x25c\n   file_write_and_wait_range+0x140/0x190\n   ubifs_fsync+0xe8/0x290\n   vfs_fsync_range+0xc0/0x1e4\n   do_fsync+0x40/0x90\n   __arm64_sys_fsync+0x34/0x50\n   invoke_syscall.constprop.0+0xa8/0x260\n   do_el0_svc+0xc8/0x1f0\n   el0_svc+0x34/0x70\n   el0t_64_sync_handler+0x108/0x114\n   el0t_64_sync+0x1a4/0x1a8\n\n  Freed by task 403:\n   kasan_save_stack+0x38/0x70\n   kasan_set_track+0x28/0x40\n   kasan_set_free_info+0x28/0x4c\n   __kasan_slab_free+0xd4/0x13c\n   kfree+0xc4/0x3a0\n   tnc_delete+0x3f4/0xe40\n   ubifs_tnc_remove_range+0x368/0x73c\n   ubifs_tnc_remove_ino+0x29c/0x2e0\n   ubifs_jnl_delete_inode+0x150/0x260\n   ubifs_evict_inode+0x1d4/0x2e4\n   evict+0x1c8/0x450\n   iput+0x2a0/0x3c4\n   do_unlinkat+0x2cc/0x490\n   __arm64_sys_unlinkat+0x90/0x100\n   invoke_syscall.constprop.0+0xa8/0x260\n   do_el0_svc+0xc8/0x1f0\n   el0_svc+0x34/0x70\n   el0t_64_sync_handler+0x108/0x114\n   el0t_64_sync+0x1a4/0x1a8\n\nThe offending `memcpy()` in `ubifs_copy_hash()` has a use-after-free\nwhen a node becomes root in TNC but still has a `cparent` to an already\nfreed node. More specifically, consider the following TNC:\n\n         zroot\n         /\n        /\n      zp1\n      /\n     /\n    zn\n\nInserting a new node `zn_new` with a key smaller then `zn` will trigger\na split in `tnc_insert()` if `zp1` is full:\n\n         zroot\n         /   \\\n        /     \\\n      zp1     zp2\n      /         \\\n     /           \\\n  zn_new          zn\n\n`zn-\u003eparent` has now been moved to `zp2`, *but* `zn-\u003ecparent` still\npoints to `zp1`.\n\nNow, consider a removal of all the nodes _except_ `zn`. Just when\n`tnc_delete()` is about to delete `zroot` and `zp2`:\n\n         zroot\n             \\\n              \\\n              zp2\n                \\\n                 \\\n                 zn\n\n`zroot` and `zp2` get freed and the tree collapses:\n\n           zn\n\n`zn` now becomes the new `zroot`.\n\n`get_znodes_to_commit()` will now only find `zn`, the new `zroot`, and\n`write_index()` will check its `znode-\u003ecparent` that wrongly points to\nthe already freed `zp1`. `ubifs_copy_hash()` thus gets wrongly called\nwith `znode-\u003ecparent-\u003ezbranch[znode-\u003eiip].hash` that triggers the\nuse-after-free!\n\nFix this by explicitly setting `znode-\u003ecparent` to `NULL` in\n`get_znodes_to_commit()` for the root node. The search for the dirty\nnodes\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached purely through local filesystem syscalls \u2014 write()/fsync() to grow the TNC, unlink() to free the old parent znode, and sync()/syncfs() to force the commit that performs the dangling write. There is no network-facing or remote path into UBIFS TNC commit.\nAC:L - The attacker fully controls every step: they choose the file creation/deletion sequence that produces the split-then-collapse tree shape (upstream reproduces it with a two-line dd/rm loop), and unprivileged syncfs() forces the commit on demand rather than waiting on the ubifs_bgt background thread, so this is a deterministic dangling-pointer dereference rather than a race against an uncontrolled party.\nPR:L - Only an ordinary unprivileged local account is required \u2014 creating, writing, unlinking files in any writable directory on the mounted UBIFS volume plus a sync()/syncfs() call, all with no capability. Mounting is root-only, but in the realistic deployment (authenticated UBIFS as the embedded rootfs) the filesystem is already mounted at boot.\nUI:N - The attacker performs the entire sequence themselves with their own file operations and their own syncfs() call; no victim action, no separate mount, and no interaction with another user\u0027s files is needed.\nS:U - The freed znode and the corrupted slab both live in kernel heap memory managed by the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The use-after-free corrupts a recycled generic-kmalloc object at an attacker-selectable offset, which can be leveraged to smash length, index, or pointer fields of sprayed structures (msg_msg, pipe buffers, keyring payloads) and turn them into an out-of-bounds kernel memory read, disclosing arbitrary kernel data.\nI:H - This is a 32-byte use-after-free WRITE (`memcpy(cparent-\u003ezbranch[ciip].hash, hash, 32)`, confirmed by KASAN\u0027s \"Write of size 32\") into a freed, spray-reallocatable slab object at one of several attacker-selectable offsets, giving a heap corruption primitive suitable for control-flow hijacking and local privilege escalation.\nA:H - The use-after-free write corrupts arbitrary recycled kernel heap objects and reliably produces oopses or panics, and it fires from the ubifs_bgt kthread or the commit path where failure marks the filesystem COMMIT_BROKEN/read-only, rendering the device unusable."
            }
          ]
        }
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        "dateUpdated": "2026-08-05T11:44:19.813Z",
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/daac4aa1825de0dbc1a6eede2fa7f9fc53f14223"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d8b3f5f4cbfbf6cb0ea4a4d5dc296872b4151eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d9807048b851d7a58d5bd089c16254af896e4df"
        },
        {
          "url": "https://git.kernel.org/stable/c/74981f7577d183acad1cd58f74c10d263711a215"
        },
        {
          "url": "https://git.kernel.org/stable/c/01d3a2293d7e4edfff96618c15727db7e51f11b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/398a91599d263e41c5f95a2fd4ebdb6280b5c6c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2497479aecebe869d23a0064e0fd1a03e34f0e2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/4617fb8fc15effe8eda4dd898d4e33eb537a7140"
        }
      ],
      "title": "ubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-53171",
    "datePublished": "2024-12-27T13:49:16.423Z",
    "dateReserved": "2024-11-19T17:17:25.006Z",
    "dateUpdated": "2026-08-05T11:44:19.813Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-53171",
      "date": "2026-09-18",
      "epss": "0.00322",
      "percentile": "0.25487"
    },
    "fkie_nvd": {
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit\n\nAfter an insertion in TNC, the tree might split and cause a node to\nchange its `znode-\u003eparent`. A further deletion of other nodes in the\ntree (which also could free the nodes), the aforementioned node\u0027s\n`znode-\u003ecparent` could still point to a freed node. This\n`znode-\u003ecparent` may not be updated when getting nodes to commit in\n`ubifs_tnc_start_commit()`. This could then trigger a use-after-free\nwhen accessing the `znode-\u003ecparent` in `write_index()` in\n`ubifs_tnc_end_commit()`.\n\nThis can be triggered by running\n\n  rm -f /etc/test-file.bin\n  dd if=/dev/urandom of=/etc/test-file.bin bs=1M count=60 conv=fsync\n\nin a loop, and with `CONFIG_UBIFS_FS_AUTHENTICATION`. KASAN then\nreports:\n\n  BUG: KASAN: use-after-free in ubifs_tnc_end_commit+0xa5c/0x1950\n  Write of size 32 at addr ffffff800a3af86c by task ubifs_bgt0_20/153\n\n  Call trace:\n   dump_backtrace+0x0/0x340\n   show_stack+0x18/0x24\n   dump_stack_lvl+0x9c/0xbc\n   print_address_description.constprop.0+0x74/0x2b0\n   kasan_report+0x1d8/0x1f0\n   kasan_check_range+0xf8/0x1a0\n   memcpy+0x84/0xf4\n   ubifs_tnc_end_commit+0xa5c/0x1950\n   do_commit+0x4e0/0x1340\n   ubifs_bg_thread+0x234/0x2e0\n   kthread+0x36c/0x410\n   ret_from_fork+0x10/0x20\n\n  Allocated by task 401:\n   kasan_save_stack+0x38/0x70\n   __kasan_kmalloc+0x8c/0xd0\n   __kmalloc+0x34c/0x5bc\n   tnc_insert+0x140/0x16a4\n   ubifs_tnc_add+0x370/0x52c\n   ubifs_jnl_write_data+0x5d8/0x870\n   do_writepage+0x36c/0x510\n   ubifs_writepage+0x190/0x4dc\n   __writepage+0x58/0x154\n   write_cache_pages+0x394/0x830\n   do_writepages+0x1f0/0x5b0\n   filemap_fdatawrite_wbc+0x170/0x25c\n   file_write_and_wait_range+0x140/0x190\n   ubifs_fsync+0xe8/0x290\n   vfs_fsync_range+0xc0/0x1e4\n   do_fsync+0x40/0x90\n   __arm64_sys_fsync+0x34/0x50\n   invoke_syscall.constprop.0+0xa8/0x260\n   do_el0_svc+0xc8/0x1f0\n   el0_svc+0x34/0x70\n   el0t_64_sync_handler+0x108/0x114\n   el0t_64_sync+0x1a4/0x1a8\n\n  Freed by task 403:\n   kasan_save_stack+0x38/0x70\n   kasan_set_track+0x28/0x40\n   kasan_set_free_info+0x28/0x4c\n   __kasan_slab_free+0xd4/0x13c\n   kfree+0xc4/0x3a0\n   tnc_delete+0x3f4/0xe40\n   ubifs_tnc_remove_range+0x368/0x73c\n   ubifs_tnc_remove_ino+0x29c/0x2e0\n   ubifs_jnl_delete_inode+0x150/0x260\n   ubifs_evict_inode+0x1d4/0x2e4\n   evict+0x1c8/0x450\n   iput+0x2a0/0x3c4\n   do_unlinkat+0x2cc/0x490\n   __arm64_sys_unlinkat+0x90/0x100\n   invoke_syscall.constprop.0+0xa8/0x260\n   do_el0_svc+0xc8/0x1f0\n   el0_svc+0x34/0x70\n   el0t_64_sync_handler+0x108/0x114\n   el0t_64_sync+0x1a4/0x1a8\n\nThe offending `memcpy()` in `ubifs_copy_hash()` has a use-after-free\nwhen a node becomes root in TNC but still has a `cparent` to an already\nfreed node. More specifically, consider the following TNC:\n\n         zroot\n         /\n        /\n      zp1\n      /\n     /\n    zn\n\nInserting a new node `zn_new` with a key smaller then `zn` will trigger\na split in `tnc_insert()` if `zp1` is full:\n\n         zroot\n         /   \\\n        /     \\\n      zp1     zp2\n      /         \\\n     /           \\\n  zn_new          zn\n\n`zn-\u003eparent` has now been moved to `zp2`, *but* `zn-\u003ecparent` still\npoints to `zp1`.\n\nNow, consider a removal of all the nodes _except_ `zn`. Just when\n`tnc_delete()` is about to delete `zroot` and `zp2`:\n\n         zroot\n             \\\n              \\\n              zp2\n                \\\n                 \\\n                 zn\n\n`zroot` and `zp2` get freed and the tree collapses:\n\n           zn\n\n`zn` now becomes the new `zroot`.\n\n`get_znodes_to_commit()` will now only find `zn`, the new `zroot`, and\n`write_index()` will check its `znode-\u003ecparent` that wrongly points to\nthe already freed `zp1`. `ubifs_copy_hash()` thus gets wrongly called\nwith `znode-\u003ecparent-\u003ezbranch[znode-\u003eiip].hash` that triggers the\nuse-after-free!\n\nFix this by explicitly setting `znode-\u003ecparent` to `NULL` in\n`get_znodes_to_commit()` for the root node. The search for the dirty\nnodes\n---truncated---"
        },
        {
          "lang": "es",
          "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ubifs: authentication: Fix use-after-free en ubifs_tnc_end_commit Despu\u00e9s de una inserci\u00f3n en TNC, el \u00e1rbol podr\u00eda dividirse y hacer que un nodo cambie su `znode-\u0026gt;parent`. Una eliminaci\u00f3n adicional de otros nodos en el \u00e1rbol (que tambi\u00e9n podr\u00eda liberar los nodos), el `znode-\u0026gt;cparent` del nodo mencionado anteriormente a\u00fan podr\u00eda apuntar a un nodo liberado. Este `znode-\u0026gt;cparent` puede no actualizarse al hacer que los nodos se comprometan en `ubifs_tnc_start_commit()`. Esto podr\u00eda desencadenar un use-after-free al acceder a `znode-\u0026gt;cparent` en `write_index()` en `ubifs_tnc_end_commit()`. Esto se puede activar ejecutando rm -f /etc/test-file.bin dd if=/dev/urandom of=/etc/test-file.bin bs=1M count=60 conv=fsync en un bucle y con `CONFIG_UBIFS_FS_AUTHENTICATION`. KASAN luego informa: ERROR: KASAN: use-after-free en ubifs_tnc_end_commit+0xa5c/0x1950 Escritura de tama\u00f1o 32 en la direcci\u00f3n ffffff800a3af86c por la tarea ubifs_bgt0_20/153 Rastreo de llamadas: dump_backtrace+0x0/0x340 show_stack+0x18/0x24 dump_stack_lvl+0x9c/0xbc print_address_description.constprop.0+0x74/0x2b0 kasan_report+0x1d8/0x1f0 kasan_check_range+0xf8/0x1a0 memcpy+0x84/0xf4 ubifs_tnc_end_commit+0xa5c/0x1950 Asignado por la tarea 401: kasan_save_stack+0x38/0x70 __kasan_kmalloc+0x8c/0xd0 __kmalloc+0x34c/0x5bc tnc_insert+0x140/0x16a4 ubifs_tnc_add+0x370/0x52c ubifs_jnl_write_data+0x5d8/0x870 do_writepage+0x36c/0x510 ubifs_writepage+0x190/0x4dc __writepage+0x58/0x154 escritura_cach\u00e9_p\u00e1ginas+0x394/0x830 do_writepages+0x1f0/0x5b0 filemap_fdatawrite_wbc+0x170/0x25c intervalo_de_escritura_y_espera_de_archivo+0x140/0x190 ubifs_fsync+0xe8/0x290 intervalo_de_fsync_vfs+0xc0/0x1e4 do_fsync+0x40/0x90 __arm64_sys_fsync+0x34/0x50 invocar_llamada_al_sistema.constprop.0+0xa8/0x260 do_el0_svc+0xc8/0x1f0 el0_svc+0x34/0x70 el0t_64_sync_handler+0x108/0x114 el0t_64_sync+0x1a4/0x1a8 Liberado por la tarea 403: kasan_save_stack+0x38/0x70 kasan_set_track+0x28/0x40 kasan_set_free_info+0x28/0x4c __kasan_slab_free+0xd4/0x13c kfree+0xc4/0x3a0 tnc_delete+0x3f4/0xe40 ubifs_tnc_remove_range+0x368/0x73c ubifs_tnc_remove_ino+0x29c/0x2e0 ubifs_jnl_delete_inode+0x150/0x260 ubifs_evict_inode+0x1d4/0x2e4 El `memcpy()` ofensivo en `ubifs_copy_hash()` tiene un use-after-free cuando un nodo se convierte en ra\u00edz en TNC pero a\u00fan tiene un `cparent` para un nodo ya liberado. M\u00e1s espec\u00edficamente, considere la siguiente TNC: zroot // zp1 // zn Insertar un nuevo nodo `zn_new` con una clave menor que `zn` activar\u00e1 una divisi\u00f3n en `tnc_insert()` si `zp1` est\u00e1 lleno: zroot / \\ / \\ zp1 zp2 / \\ / \\ zn_new zn `zn-\u0026gt;parent` ahora se ha movido a `zp2`, *pero* `zn-\u0026gt;cparent` todav\u00eda apunta a `zp1`. Ahora, considere una eliminaci\u00f3n de todos los nodos _excepto_ `zn`. Justo cuando `tnc_delete()` est\u00e1 a punto de eliminar `zroot` y `zp2`: zroot \\ \\ zp2 \\ \\ zn `zroot` y `zp2` se liberan y el \u00e1rbol colapsa: zn `zn` ahora se convierte en el nuevo `zroot`. `get_znodes_to_commit()` ahora solo encontrar\u00e1 `zn`, el nuevo `zroot`, y `write_index()` verificar\u00e1 su `znode-\u0026gt;cparent` que apunta err\u00f3neamente al `zp1` ya liberado. Por lo tanto, `ubifs_copy_hash()` se llama err\u00f3neamente con `znode-\u0026gt;cparent-\u0026gt;zbranch[znode-\u0026gt;iip].hash` que activa el use-after-free. Solucione esto configurando expl\u00edcitamente `znode-\u0026gt;cparent` en `NULL` en `get_znodes_to_commit()` para el nodo ra\u00edz. La b\u00fasqueda de los nodos sucios ---truncada---"
        }
      ],
      "id": "CVE-2024-53171",
      "lastModified": "2024-12-27T14:15:24.300",
      "published": "2024-12-27T14:15:24.300",
      "references": [
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/01d3a2293d7e4edfff96618c15727db7e51f11b6"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/2497479aecebe869d23a0064e0fd1a03e34f0e2a"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/398a91599d263e41c5f95a2fd4ebdb6280b5c6c3"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/4617fb8fc15effe8eda4dd898d4e33eb537a7140"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/4d9807048b851d7a58d5bd089c16254af896e4df"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/74981f7577d183acad1cd58f74c10d263711a215"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/8d8b3f5f4cbfbf6cb0ea4a4d5dc296872b4151eb"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/daac4aa1825de0dbc1a6eede2fa7f9fc53f14223"
        }
      ],
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Undergoing Analysis"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-19T01:47:49.000Z",
      "cve": "CVE-2024-53171",
      "id": "msrc_CVE-2024-53171",
      "initial_release_date": "2024-12-02T00:00:00.000Z",
      "product_status:known_not_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-53171.json",
      "version": "3"
    },
    "nvd": {
      "cve": {
        "affected": [
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            "affectedData": [
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                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/ubifs/tnc_commit.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "daac4aa1825de0dbc1a6eede2fa7f9fc53f14223",
                    "status": "affected",
                    "version": "16a26b20d2afd0cf063816725b45b12e78d5bb31",
                    "versionType": "git"
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                  {
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                    "status": "affected",
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                    "versionType": "git"
                  },
                  {
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                    "status": "affected",
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                    "versionType": "git"
                  },
                  {
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                    "status": "affected",
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                    "versionType": "git"
                  },
                  {
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                    "status": "affected",
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                    "versionType": "git"
                  },
                  {
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                    "versionType": "git"
                  },
                  {
                    "lessThan": "2497479aecebe869d23a0064e0fd1a03e34f0e2a",
                    "status": "affected",
                    "version": "16a26b20d2afd0cf063816725b45b12e78d5bb31",
                    "versionType": "git"
                  },
                  {
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                    "status": "affected",
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                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/ubifs/tnc_commit.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "4.20"
                  },
                  {
                    "lessThan": "4.20",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.4.*",
                    "status": "unaffected",
                    "version": "5.4.287",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.231",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.174",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.120",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.64",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.11.*",
                    "status": "unaffected",
                    "version": "6.11.11",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.2",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.13",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
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                    "matchCriteriaId": "E4B15788-D35E-4E5B-A9C0-070AE3729B34",
                    "versionEndExcluding": "5.4.287",
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                    "vulnerable": true
                  },
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                    "matchCriteriaId": "B5C644CC-2BD7-4E32-BC54-8DCC7ABE9935",
                    "versionEndExcluding": "5.10.231",
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                  },
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                    "matchCriteriaId": "419FD073-1517-4FD5-8158-F94BC68A1E89",
                    "versionEndExcluding": "5.15.174",
                    "versionStartIncluding": "5.11",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "09AC6122-E2A4-40FE-9D33-268A1B2EC265",
                    "versionEndExcluding": "6.1.120",
                    "versionStartIncluding": "5.16",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "CA16DEE3-ABEC-4449-9F4A-7A3DC4FC36C7",
                    "versionEndExcluding": "6.6.64",
                    "versionStartIncluding": "6.2",
                    "vulnerable": true
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                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "21434379-192D-472F-9B54-D45E3650E893",
                    "versionEndExcluding": "6.11.11",
                    "versionStartIncluding": "6.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D8882B1B-2ABC-4838-AC1D-DBDBB5764776",
                    "versionEndExcluding": "6.12.2",
                    "versionStartIncluding": "6.12",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit\n\nAfter an insertion in TNC, the tree might split and cause a node to\nchange its `znode-\u003eparent`. A further deletion of other nodes in the\ntree (which also could free the nodes), the aforementioned node\u0027s\n`znode-\u003ecparent` could still point to a freed node. This\n`znode-\u003ecparent` may not be updated when getting nodes to commit in\n`ubifs_tnc_start_commit()`. This could then trigger a use-after-free\nwhen accessing the `znode-\u003ecparent` in `write_index()` in\n`ubifs_tnc_end_commit()`.\n\nThis can be triggered by running\n\n  rm -f /etc/test-file.bin\n  dd if=/dev/urandom of=/etc/test-file.bin bs=1M count=60 conv=fsync\n\nin a loop, and with `CONFIG_UBIFS_FS_AUTHENTICATION`. KASAN then\nreports:\n\n  BUG: KASAN: use-after-free in ubifs_tnc_end_commit+0xa5c/0x1950\n  Write of size 32 at addr ffffff800a3af86c by task ubifs_bgt0_20/153\n\n  Call trace:\n   dump_backtrace+0x0/0x340\n   show_stack+0x18/0x24\n   dump_stack_lvl+0x9c/0xbc\n   print_address_description.constprop.0+0x74/0x2b0\n   kasan_report+0x1d8/0x1f0\n   kasan_check_range+0xf8/0x1a0\n   memcpy+0x84/0xf4\n   ubifs_tnc_end_commit+0xa5c/0x1950\n   do_commit+0x4e0/0x1340\n   ubifs_bg_thread+0x234/0x2e0\n   kthread+0x36c/0x410\n   ret_from_fork+0x10/0x20\n\n  Allocated by task 401:\n   kasan_save_stack+0x38/0x70\n   __kasan_kmalloc+0x8c/0xd0\n   __kmalloc+0x34c/0x5bc\n   tnc_insert+0x140/0x16a4\n   ubifs_tnc_add+0x370/0x52c\n   ubifs_jnl_write_data+0x5d8/0x870\n   do_writepage+0x36c/0x510\n   ubifs_writepage+0x190/0x4dc\n   __writepage+0x58/0x154\n   write_cache_pages+0x394/0x830\n   do_writepages+0x1f0/0x5b0\n   filemap_fdatawrite_wbc+0x170/0x25c\n   file_write_and_wait_range+0x140/0x190\n   ubifs_fsync+0xe8/0x290\n   vfs_fsync_range+0xc0/0x1e4\n   do_fsync+0x40/0x90\n   __arm64_sys_fsync+0x34/0x50\n   invoke_syscall.constprop.0+0xa8/0x260\n   do_el0_svc+0xc8/0x1f0\n   el0_svc+0x34/0x70\n   el0t_64_sync_handler+0x108/0x114\n   el0t_64_sync+0x1a4/0x1a8\n\n  Freed by task 403:\n   kasan_save_stack+0x38/0x70\n   kasan_set_track+0x28/0x40\n   kasan_set_free_info+0x28/0x4c\n   __kasan_slab_free+0xd4/0x13c\n   kfree+0xc4/0x3a0\n   tnc_delete+0x3f4/0xe40\n   ubifs_tnc_remove_range+0x368/0x73c\n   ubifs_tnc_remove_ino+0x29c/0x2e0\n   ubifs_jnl_delete_inode+0x150/0x260\n   ubifs_evict_inode+0x1d4/0x2e4\n   evict+0x1c8/0x450\n   iput+0x2a0/0x3c4\n   do_unlinkat+0x2cc/0x490\n   __arm64_sys_unlinkat+0x90/0x100\n   invoke_syscall.constprop.0+0xa8/0x260\n   do_el0_svc+0xc8/0x1f0\n   el0_svc+0x34/0x70\n   el0t_64_sync_handler+0x108/0x114\n   el0t_64_sync+0x1a4/0x1a8\n\nThe offending `memcpy()` in `ubifs_copy_hash()` has a use-after-free\nwhen a node becomes root in TNC but still has a `cparent` to an already\nfreed node. More specifically, consider the following TNC:\n\n         zroot\n         /\n        /\n      zp1\n      /\n     /\n    zn\n\nInserting a new node `zn_new` with a key smaller then `zn` will trigger\na split in `tnc_insert()` if `zp1` is full:\n\n         zroot\n         /   \\\n        /     \\\n      zp1     zp2\n      /         \\\n     /           \\\n  zn_new          zn\n\n`zn-\u003eparent` has now been moved to `zp2`, *but* `zn-\u003ecparent` still\npoints to `zp1`.\n\nNow, consider a removal of all the nodes _except_ `zn`. Just when\n`tnc_delete()` is about to delete `zroot` and `zp2`:\n\n         zroot\n             \\\n              \\\n              zp2\n                \\\n                 \\\n                 zn\n\n`zroot` and `zp2` get freed and the tree collapses:\n\n           zn\n\n`zn` now becomes the new `zroot`.\n\n`get_znodes_to_commit()` will now only find `zn`, the new `zroot`, and\n`write_index()` will check its `znode-\u003ecparent` that wrongly points to\nthe already freed `zp1`. `ubifs_copy_hash()` thus gets wrongly called\nwith `znode-\u003ecparent-\u003ezbranch[znode-\u003eiip].hash` that triggers the\nuse-after-free!\n\nFix this by explicitly setting `znode-\u003ecparent` to `NULL` in\n`get_znodes_to_commit()` for the root node. The search for the dirty\nnodes\n---truncated---"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ubifs: authentication: Fix use-after-free en ubifs_tnc_end_commit Despu\u00e9s de una inserci\u00f3n en TNC, el \u00e1rbol podr\u00eda dividirse y hacer que un nodo cambie su `znode-\u0026gt;parent`. Una eliminaci\u00f3n adicional de otros nodos en el \u00e1rbol (que tambi\u00e9n podr\u00eda liberar los nodos), el `znode-\u0026gt;cparent` del nodo mencionado anteriormente a\u00fan podr\u00eda apuntar a un nodo liberado. Este `znode-\u0026gt;cparent` puede no actualizarse al hacer que los nodos se comprometan en `ubifs_tnc_start_commit()`. Esto podr\u00eda desencadenar un use-after-free al acceder a `znode-\u0026gt;cparent` en `write_index()` en `ubifs_tnc_end_commit()`. Esto se puede activar ejecutando rm -f /etc/test-file.bin dd if=/dev/urandom of=/etc/test-file.bin bs=1M count=60 conv=fsync en un bucle y con `CONFIG_UBIFS_FS_AUTHENTICATION`. KASAN luego informa: ERROR: KASAN: use-after-free en ubifs_tnc_end_commit+0xa5c/0x1950 Escritura de tama\u00f1o 32 en la direcci\u00f3n ffffff800a3af86c por la tarea ubifs_bgt0_20/153 Rastreo de llamadas: dump_backtrace+0x0/0x340 show_stack+0x18/0x24 dump_stack_lvl+0x9c/0xbc print_address_description.constprop.0+0x74/0x2b0 kasan_report+0x1d8/0x1f0 kasan_check_range+0xf8/0x1a0 memcpy+0x84/0xf4 ubifs_tnc_end_commit+0xa5c/0x1950 Asignado por la tarea 401: kasan_save_stack+0x38/0x70 __kasan_kmalloc+0x8c/0xd0 __kmalloc+0x34c/0x5bc tnc_insert+0x140/0x16a4 ubifs_tnc_add+0x370/0x52c ubifs_jnl_write_data+0x5d8/0x870 do_writepage+0x36c/0x510 ubifs_writepage+0x190/0x4dc __writepage+0x58/0x154 escritura_cach\u00e9_p\u00e1ginas+0x394/0x830 do_writepages+0x1f0/0x5b0 filemap_fdatawrite_wbc+0x170/0x25c intervalo_de_escritura_y_espera_de_archivo+0x140/0x190 ubifs_fsync+0xe8/0x290 intervalo_de_fsync_vfs+0xc0/0x1e4 do_fsync+0x40/0x90 __arm64_sys_fsync+0x34/0x50 invocar_llamada_al_sistema.constprop.0+0xa8/0x260 do_el0_svc+0xc8/0x1f0 el0_svc+0x34/0x70 el0t_64_sync_handler+0x108/0x114 el0t_64_sync+0x1a4/0x1a8 Liberado por la tarea 403: kasan_save_stack+0x38/0x70 kasan_set_track+0x28/0x40 kasan_set_free_info+0x28/0x4c __kasan_slab_free+0xd4/0x13c kfree+0xc4/0x3a0 tnc_delete+0x3f4/0xe40 ubifs_tnc_remove_range+0x368/0x73c ubifs_tnc_remove_ino+0x29c/0x2e0 ubifs_jnl_delete_inode+0x150/0x260 ubifs_evict_inode+0x1d4/0x2e4 El `memcpy()` ofensivo en `ubifs_copy_hash()` tiene un use-after-free cuando un nodo se convierte en ra\u00edz en TNC pero a\u00fan tiene un `cparent` para un nodo ya liberado. M\u00e1s espec\u00edficamente, considere la siguiente TNC: zroot // zp1 // zn Insertar un nuevo nodo `zn_new` con una clave menor que `zn` activar\u00e1 una divisi\u00f3n en `tnc_insert()` si `zp1` est\u00e1 lleno: zroot / \\ / \\ zp1 zp2 / \\ / \\ zn_new zn `zn-\u0026gt;parent` ahora se ha movido a `zp2`, *pero* `zn-\u0026gt;cparent` todav\u00eda apunta a `zp1`. Ahora, considere una eliminaci\u00f3n de todos los nodos _excepto_ `zn`. Justo cuando `tnc_delete()` est\u00e1 a punto de eliminar `zroot` y `zp2`: zroot \\ \\ zp2 \\ \\ zn `zroot` y `zp2` se liberan y el \u00e1rbol colapsa: zn `zn` ahora se convierte en el nuevo `zroot`. `get_znodes_to_commit()` ahora solo encontrar\u00e1 `zn`, el nuevo `zroot`, y `write_index()` verificar\u00e1 su `znode-\u0026gt;cparent` que apunta err\u00f3neamente al `zp1` ya liberado. Por lo tanto, `ubifs_copy_hash()` se llama err\u00f3neamente con `znode-\u0026gt;cparent-\u0026gt;zbranch[znode-\u0026gt;iip].hash` que activa el use-after-free. Solucione esto configurando expl\u00edcitamente `znode-\u0026gt;cparent` en `NULL` en `get_znodes_to_commit()` para el nodo ra\u00edz. La b\u00fasqueda de los nodos sucios ---truncada---"
          }
        ],
        "id": "CVE-2024-53171",
        "lastModified": "2026-06-17T08:08:28.990",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            },
            {
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                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
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                "options": [
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                  {
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                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-11T15:43:44.944550Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-12-27T14:15:24.300",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
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          },
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            "url": "https://git.kernel.org/stable/c/2497479aecebe869d23a0064e0fd1a03e34f0e2a"
          },
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          },
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          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
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            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T13:51:05+00:00",
      "cve": "CVE-2024-53171",
      "id": "CVE-2024-53171",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-53171.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-16T00:21:53Z",
      "cve": "CVE-2024-53171",
      "id": "CVE-2024-53171",
      "initial_release_date": "2024-12-28T03:50:54Z",
      "product_status:known_affected": "364",
      "product_status:known_not_affected": "250",
      "product_status:recommended": "381",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-53171",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-53171.json",
      "version": "66"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
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                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-53171",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-02-11T15:43:44.944550Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
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              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-416",
                    "description": "CWE-416 Use After Free",
                    "lang": "en",
                    "type": "CWE"
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                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-02-11T15:43:47.043Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/ubifs/tnc_commit.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "daac4aa1825de0dbc1a6eede2fa7f9fc53f14223",
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                  "versionType": "git"
                },
                {
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                },
                {
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                {
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                },
                {
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                  "version": "16a26b20d2afd0cf063816725b45b12e78d5bb31",
                  "versionType": "git"
                },
                {
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                  "status": "affected",
                  "version": "16a26b20d2afd0cf063816725b45b12e78d5bb31",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/ubifs/tnc_commit.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.20"
                },
                {
                  "lessThan": "4.20",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.287",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.231",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.174",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.120",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.64",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.11.*",
                  "status": "unaffected",
                  "version": "6.11.11",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.2",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit\n\nAfter an insertion in TNC, the tree might split and cause a node to\nchange its `znode-\u003eparent`. A further deletion of other nodes in the\ntree (which also could free the nodes), the aforementioned node\u0027s\n`znode-\u003ecparent` could still point to a freed node. This\n`znode-\u003ecparent` may not be updated when getting nodes to commit in\n`ubifs_tnc_start_commit()`. This could then trigger a use-after-free\nwhen accessing the `znode-\u003ecparent` in `write_index()` in\n`ubifs_tnc_end_commit()`.\n\nThis can be triggered by running\n\n  rm -f /etc/test-file.bin\n  dd if=/dev/urandom of=/etc/test-file.bin bs=1M count=60 conv=fsync\n\nin a loop, and with `CONFIG_UBIFS_FS_AUTHENTICATION`. KASAN then\nreports:\n\n  BUG: KASAN: use-after-free in ubifs_tnc_end_commit+0xa5c/0x1950\n  Write of size 32 at addr ffffff800a3af86c by task ubifs_bgt0_20/153\n\n  Call trace:\n   dump_backtrace+0x0/0x340\n   show_stack+0x18/0x24\n   dump_stack_lvl+0x9c/0xbc\n   print_address_description.constprop.0+0x74/0x2b0\n   kasan_report+0x1d8/0x1f0\n   kasan_check_range+0xf8/0x1a0\n   memcpy+0x84/0xf4\n   ubifs_tnc_end_commit+0xa5c/0x1950\n   do_commit+0x4e0/0x1340\n   ubifs_bg_thread+0x234/0x2e0\n   kthread+0x36c/0x410\n   ret_from_fork+0x10/0x20\n\n  Allocated by task 401:\n   kasan_save_stack+0x38/0x70\n   __kasan_kmalloc+0x8c/0xd0\n   __kmalloc+0x34c/0x5bc\n   tnc_insert+0x140/0x16a4\n   ubifs_tnc_add+0x370/0x52c\n   ubifs_jnl_write_data+0x5d8/0x870\n   do_writepage+0x36c/0x510\n   ubifs_writepage+0x190/0x4dc\n   __writepage+0x58/0x154\n   write_cache_pages+0x394/0x830\n   do_writepages+0x1f0/0x5b0\n   filemap_fdatawrite_wbc+0x170/0x25c\n   file_write_and_wait_range+0x140/0x190\n   ubifs_fsync+0xe8/0x290\n   vfs_fsync_range+0xc0/0x1e4\n   do_fsync+0x40/0x90\n   __arm64_sys_fsync+0x34/0x50\n   invoke_syscall.constprop.0+0xa8/0x260\n   do_el0_svc+0xc8/0x1f0\n   el0_svc+0x34/0x70\n   el0t_64_sync_handler+0x108/0x114\n   el0t_64_sync+0x1a4/0x1a8\n\n  Freed by task 403:\n   kasan_save_stack+0x38/0x70\n   kasan_set_track+0x28/0x40\n   kasan_set_free_info+0x28/0x4c\n   __kasan_slab_free+0xd4/0x13c\n   kfree+0xc4/0x3a0\n   tnc_delete+0x3f4/0xe40\n   ubifs_tnc_remove_range+0x368/0x73c\n   ubifs_tnc_remove_ino+0x29c/0x2e0\n   ubifs_jnl_delete_inode+0x150/0x260\n   ubifs_evict_inode+0x1d4/0x2e4\n   evict+0x1c8/0x450\n   iput+0x2a0/0x3c4\n   do_unlinkat+0x2cc/0x490\n   __arm64_sys_unlinkat+0x90/0x100\n   invoke_syscall.constprop.0+0xa8/0x260\n   do_el0_svc+0xc8/0x1f0\n   el0_svc+0x34/0x70\n   el0t_64_sync_handler+0x108/0x114\n   el0t_64_sync+0x1a4/0x1a8\n\nThe offending `memcpy()` in `ubifs_copy_hash()` has a use-after-free\nwhen a node becomes root in TNC but still has a `cparent` to an already\nfreed node. More specifically, consider the following TNC:\n\n         zroot\n         /\n        /\n      zp1\n      /\n     /\n    zn\n\nInserting a new node `zn_new` with a key smaller then `zn` will trigger\na split in `tnc_insert()` if `zp1` is full:\n\n         zroot\n         /   \\\n        /     \\\n      zp1     zp2\n      /         \\\n     /           \\\n  zn_new          zn\n\n`zn-\u003eparent` has now been moved to `zp2`, *but* `zn-\u003ecparent` still\npoints to `zp1`.\n\nNow, consider a removal of all the nodes _except_ `zn`. Just when\n`tnc_delete()` is about to delete `zroot` and `zp2`:\n\n         zroot\n             \\\n              \\\n              zp2\n                \\\n                 \\\n                 zn\n\n`zroot` and `zp2` get freed and the tree collapses:\n\n           zn\n\n`zn` now becomes the new `zroot`.\n\n`get_znodes_to_commit()` will now only find `zn`, the new `zroot`, and\n`write_index()` will check its `znode-\u003ecparent` that wrongly points to\nthe already freed `zp1`. `ubifs_copy_hash()` thus gets wrongly called\nwith `znode-\u003ecparent-\u003ezbranch[znode-\u003eiip].hash` that triggers the\nuse-after-free!\n\nFix this by explicitly setting `znode-\u003ecparent` to `NULL` in\n`get_znodes_to_commit()` for the root node. The search for the dirty\nnodes\n---truncated---"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-01-20T06:20:27.160Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/daac4aa1825de0dbc1a6eede2fa7f9fc53f14223"
            },
            {
              "url": "https://git.kernel.org/stable/c/8d8b3f5f4cbfbf6cb0ea4a4d5dc296872b4151eb"
            },
            {
              "url": "https://git.kernel.org/stable/c/4d9807048b851d7a58d5bd089c16254af896e4df"
            },
            {
              "url": "https://git.kernel.org/stable/c/74981f7577d183acad1cd58f74c10d263711a215"
            },
            {
              "url": "https://git.kernel.org/stable/c/01d3a2293d7e4edfff96618c15727db7e51f11b6"
            },
            {
              "url": "https://git.kernel.org/stable/c/398a91599d263e41c5f95a2fd4ebdb6280b5c6c3"
            },
            {
              "url": "https://git.kernel.org/stable/c/2497479aecebe869d23a0064e0fd1a03e34f0e2a"
            },
            {
              "url": "https://git.kernel.org/stable/c/4617fb8fc15effe8eda4dd898d4e33eb537a7140"
            }
          ],
          "title": "ubifs: authentication: Fix use-after-free in ubifs_tnc_end_commit",
          "x_generator": {
            "engine": "bippy-5f407fcff5a0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-53171",
        "datePublished": "2024-12-27T13:49:16.423Z",
        "dateReserved": "2024-11-19T17:17:25.006Z",
        "dateUpdated": "2025-02-11T15:45:27.208Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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