Vulnerability-Lookup

GSD-2022-48631

Vulnerability from gsd - Updated: 2024-02-26 06:00

Details

In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0 When walking through an inode extents, the ext4_ext_binsearch_idx() function assumes that the extent header has been previously validated. However, there are no checks that verify that the number of entries (eh->eh_entries) is non-zero when depth is > 0. And this will lead to problems because the EXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this: [ 135.245946] ------------[ cut here ]------------ [ 135.247579] kernel BUG at fs/ext4/extents.c:2258! [ 135.249045] invalid opcode: 0000 [#1] PREEMPT SMP [ 135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4 [ 135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014 [ 135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0 [ 135.256475] Code: [ 135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246 [ 135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023 [ 135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c [ 135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c [ 135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024 [ 135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000 [ 135.272394] FS: 00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000 [ 135.274510] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0 [ 135.277952] Call Trace: [ 135.278635] <TASK> [ 135.279247] ? preempt_count_add+0x6d/0xa0 [ 135.280358] ? percpu_counter_add_batch+0x55/0xb0 [ 135.281612] ? _raw_read_unlock+0x18/0x30 [ 135.282704] ext4_map_blocks+0x294/0x5a0 [ 135.283745] ? xa_load+0x6f/0xa0 [ 135.284562] ext4_mpage_readpages+0x3d6/0x770 [ 135.285646] read_pages+0x67/0x1d0 [ 135.286492] ? folio_add_lru+0x51/0x80 [ 135.287441] page_cache_ra_unbounded+0x124/0x170 [ 135.288510] filemap_get_pages+0x23d/0x5a0 [ 135.289457] ? path_openat+0xa72/0xdd0 [ 135.290332] filemap_read+0xbf/0x300 [ 135.291158] ? _raw_spin_lock_irqsave+0x17/0x40 [ 135.292192] new_sync_read+0x103/0x170 [ 135.293014] vfs_read+0x15d/0x180 [ 135.293745] ksys_read+0xa1/0xe0 [ 135.294461] do_syscall_64+0x3c/0x80 [ 135.295284] entry_SYSCALL_64_after_hwframe+0x46/0xb0 This patch simply adds an extra check in __ext4_ext_check(), verifying that eh_entries is not 0 when eh_depth is > 0.

Aliases

CVE-2022-48631

JSON

To clipboard

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2022-48631"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug in extents parsing when eh_entries == 0 and eh_depth \u003e 0\n\nWhen walking through an inode extents, the ext4_ext_binsearch_idx() function\nassumes that the extent header has been previously validated.  However, there\nare no checks that verify that the number of entries (eh-\u003eeh_entries) is\nnon-zero when depth is \u003e 0.  And this will lead to problems because the\nEXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:\n\n[  135.245946] ------------[ cut here ]------------\n[  135.247579] kernel BUG at fs/ext4/extents.c:2258!\n[  135.249045] invalid opcode: 0000 [#1] PREEMPT SMP\n[  135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4\n[  135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n[  135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0\n[  135.256475] Code:\n[  135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246\n[  135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023\n[  135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c\n[  135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c\n[  135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024\n[  135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000\n[  135.272394] FS:  00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000\n[  135.274510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0\n[  135.277952] Call Trace:\n[  135.278635]  \u003cTASK\u003e\n[  135.279247]  ? preempt_count_add+0x6d/0xa0\n[  135.280358]  ? percpu_counter_add_batch+0x55/0xb0\n[  135.281612]  ? _raw_read_unlock+0x18/0x30\n[  135.282704]  ext4_map_blocks+0x294/0x5a0\n[  135.283745]  ? xa_load+0x6f/0xa0\n[  135.284562]  ext4_mpage_readpages+0x3d6/0x770\n[  135.285646]  read_pages+0x67/0x1d0\n[  135.286492]  ? folio_add_lru+0x51/0x80\n[  135.287441]  page_cache_ra_unbounded+0x124/0x170\n[  135.288510]  filemap_get_pages+0x23d/0x5a0\n[  135.289457]  ? path_openat+0xa72/0xdd0\n[  135.290332]  filemap_read+0xbf/0x300\n[  135.291158]  ? _raw_spin_lock_irqsave+0x17/0x40\n[  135.292192]  new_sync_read+0x103/0x170\n[  135.293014]  vfs_read+0x15d/0x180\n[  135.293745]  ksys_read+0xa1/0xe0\n[  135.294461]  do_syscall_64+0x3c/0x80\n[  135.295284]  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThis patch simply adds an extra check in __ext4_ext_check(), verifying that\neh_entries is not 0 when eh_depth is \u003e 0.",
      "id": "GSD-2022-48631",
      "modified": "2024-02-26T06:00:31.206496Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2022-48631",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "1da177e4c3f4",
                          "version_value": "bb7eb3ca4b3b"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "lessThanOrEqual": "5.4.*",
                                "status": "unaffected",
                                "version": "5.4.215",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "5.10.*",
                                "status": "unaffected",
                                "version": "5.10.146",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "5.15.*",
                                "status": "unaffected",
                                "version": "5.15.71",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "5.19.*",
                                "status": "unaffected",
                                "version": "5.19.12",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "6.0",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug in extents parsing when eh_entries == 0 and eh_depth \u003e 0\n\nWhen walking through an inode extents, the ext4_ext_binsearch_idx() function\nassumes that the extent header has been previously validated.  However, there\nare no checks that verify that the number of entries (eh-\u003eeh_entries) is\nnon-zero when depth is \u003e 0.  And this will lead to problems because the\nEXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:\n\n[  135.245946] ------------[ cut here ]------------\n[  135.247579] kernel BUG at fs/ext4/extents.c:2258!\n[  135.249045] invalid opcode: 0000 [#1] PREEMPT SMP\n[  135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4\n[  135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n[  135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0\n[  135.256475] Code:\n[  135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246\n[  135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023\n[  135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c\n[  135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c\n[  135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024\n[  135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000\n[  135.272394] FS:  00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000\n[  135.274510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0\n[  135.277952] Call Trace:\n[  135.278635]  \u003cTASK\u003e\n[  135.279247]  ? preempt_count_add+0x6d/0xa0\n[  135.280358]  ? percpu_counter_add_batch+0x55/0xb0\n[  135.281612]  ? _raw_read_unlock+0x18/0x30\n[  135.282704]  ext4_map_blocks+0x294/0x5a0\n[  135.283745]  ? xa_load+0x6f/0xa0\n[  135.284562]  ext4_mpage_readpages+0x3d6/0x770\n[  135.285646]  read_pages+0x67/0x1d0\n[  135.286492]  ? folio_add_lru+0x51/0x80\n[  135.287441]  page_cache_ra_unbounded+0x124/0x170\n[  135.288510]  filemap_get_pages+0x23d/0x5a0\n[  135.289457]  ? path_openat+0xa72/0xdd0\n[  135.290332]  filemap_read+0xbf/0x300\n[  135.291158]  ? _raw_spin_lock_irqsave+0x17/0x40\n[  135.292192]  new_sync_read+0x103/0x170\n[  135.293014]  vfs_read+0x15d/0x180\n[  135.293745]  ksys_read+0xa1/0xe0\n[  135.294461]  do_syscall_64+0x3c/0x80\n[  135.295284]  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThis patch simply adds an extra check in __ext4_ext_check(), verifying that\neh_entries is not 0 when eh_depth is \u003e 0."
          }
        ]
      },
      "generator": {
        "engine": "bippy-d175d3acf727"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0"
          },
          {
            "name": "https://git.kernel.org/stable/c/958b0ee23f5ac106e7cc11472b71aa2ea9a033bc",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/958b0ee23f5ac106e7cc11472b71aa2ea9a033bc"
          },
          {
            "name": "https://git.kernel.org/stable/c/be4df018c0be5ebecf1ca510feacc23be415cefc",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/be4df018c0be5ebecf1ca510feacc23be415cefc"
          },
          {
            "name": "https://git.kernel.org/stable/c/2f5e9de15e4f55fbf56f22d4a2ce406246cc462d",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/2f5e9de15e4f55fbf56f22d4a2ce406246cc462d"
          },
          {
            "name": "https://git.kernel.org/stable/c/29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug in extents parsing when eh_entries == 0 and eh_depth \u003e 0\n\nWhen walking through an inode extents, the ext4_ext_binsearch_idx() function\nassumes that the extent header has been previously validated.  However, there\nare no checks that verify that the number of entries (eh-\u003eeh_entries) is\nnon-zero when depth is \u003e 0.  And this will lead to problems because the\nEXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:\n\n[  135.245946] ------------[ cut here ]------------\n[  135.247579] kernel BUG at fs/ext4/extents.c:2258!\n[  135.249045] invalid opcode: 0000 [#1] PREEMPT SMP\n[  135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4\n[  135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n[  135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0\n[  135.256475] Code:\n[  135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246\n[  135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023\n[  135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c\n[  135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c\n[  135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024\n[  135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000\n[  135.272394] FS:  00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000\n[  135.274510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0\n[  135.277952] Call Trace:\n[  135.278635]  \u003cTASK\u003e\n[  135.279247]  ? preempt_count_add+0x6d/0xa0\n[  135.280358]  ? percpu_counter_add_batch+0x55/0xb0\n[  135.281612]  ? _raw_read_unlock+0x18/0x30\n[  135.282704]  ext4_map_blocks+0x294/0x5a0\n[  135.283745]  ? xa_load+0x6f/0xa0\n[  135.284562]  ext4_mpage_readpages+0x3d6/0x770\n[  135.285646]  read_pages+0x67/0x1d0\n[  135.286492]  ? folio_add_lru+0x51/0x80\n[  135.287441]  page_cache_ra_unbounded+0x124/0x170\n[  135.288510]  filemap_get_pages+0x23d/0x5a0\n[  135.289457]  ? path_openat+0xa72/0xdd0\n[  135.290332]  filemap_read+0xbf/0x300\n[  135.291158]  ? _raw_spin_lock_irqsave+0x17/0x40\n[  135.292192]  new_sync_read+0x103/0x170\n[  135.293014]  vfs_read+0x15d/0x180\n[  135.293745]  ksys_read+0xa1/0xe0\n[  135.294461]  do_syscall_64+0x3c/0x80\n[  135.295284]  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThis patch simply adds an extra check in __ext4_ext_check(), verifying that\neh_entries is not 0 when eh_depth is \u003e 0."
          }
        ],
        "id": "CVE-2022-48631",
        "lastModified": "2024-04-28T13:15:06.450",
        "metrics": {},
        "published": "2024-04-28T13:15:06.450",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2f5e9de15e4f55fbf56f22d4a2ce406246cc462d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/958b0ee23f5ac106e7cc11472b71aa2ea9a033bc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/be4df018c0be5ebecf1ca510feacc23be415cefc"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}

CVE-2022-48631 (GCVE-0-2022-48631)

Vulnerability from cvelistv5 – Published: 2024-04-28 12:59 – Updated: 2026-05-11 18:44

Title

ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0

Summary

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-28 18:41 UTC

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/bb7eb3ca4b3b0d2c7…
https://git.kernel.org/stable/c/958b0ee23f5ac106e…
https://git.kernel.org/stable/c/be4df018c0be5ebec…
https://git.kernel.org/stable/c/2f5e9de15e4f55fbf…
https://git.kernel.org/stable/c/29a5b8a137ac8eb41…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c29c0ae7f282828da3695167ed870131798348d9 , < bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0 (git) Affected: c29c0ae7f282828da3695167ed870131798348d9 , < 958b0ee23f5ac106e7cc11472b71aa2ea9a033bc (git) Affected: c29c0ae7f282828da3695167ed870131798348d9 , < be4df018c0be5ebecf1ca510feacc23be415cefc (git) Affected: c29c0ae7f282828da3695167ed870131798348d9 , < 2f5e9de15e4f55fbf56f22d4a2ce406246cc462d (git) Affected: c29c0ae7f282828da3695167ed870131798348d9 , < 29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0 (git)
Linux	Linux	Affected: 2.6.23 Unaffected: 0 , < 2.6.23 (semver) Unaffected: 5.4.215 , ≤ 5.4.* (semver) Unaffected: 5.10.146 , ≤ 5.10.* (semver) Unaffected: 5.15.71 , ≤ 5.15.* (semver) Unaffected: 5.19.12 , ≤ 5.19.* (semver) Unaffected: 6.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-48631",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-28T18:41:13.268987Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:16:47.424Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T15:17:55.530Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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        "references": [
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            "url": "https://git.kernel.org/stable/c/bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0"
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            "url": "https://git.kernel.org/stable/c/958b0ee23f5ac106e7cc11472b71aa2ea9a033bc"
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          {
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              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/be4df018c0be5ebecf1ca510feacc23be415cefc"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/2f5e9de15e4f55fbf56f22d4a2ce406246cc462d"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/extents.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0",
              "status": "affected",
              "version": "c29c0ae7f282828da3695167ed870131798348d9",
              "versionType": "git"
            },
            {
              "lessThan": "958b0ee23f5ac106e7cc11472b71aa2ea9a033bc",
              "status": "affected",
              "version": "c29c0ae7f282828da3695167ed870131798348d9",
              "versionType": "git"
            },
            {
              "lessThan": "be4df018c0be5ebecf1ca510feacc23be415cefc",
              "status": "affected",
              "version": "c29c0ae7f282828da3695167ed870131798348d9",
              "versionType": "git"
            },
            {
              "lessThan": "2f5e9de15e4f55fbf56f22d4a2ce406246cc462d",
              "status": "affected",
              "version": "c29c0ae7f282828da3695167ed870131798348d9",
              "versionType": "git"
            },
            {
              "lessThan": "29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0",
              "status": "affected",
              "version": "c29c0ae7f282828da3695167ed870131798348d9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/extents.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.23"
            },
            {
              "lessThan": "2.6.23",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.215",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.146",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.71",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.215",
                  "versionStartIncluding": "2.6.23",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.146",
                  "versionStartIncluding": "2.6.23",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.71",
                  "versionStartIncluding": "2.6.23",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.12",
                  "versionStartIncluding": "2.6.23",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "2.6.23",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug in extents parsing when eh_entries == 0 and eh_depth \u003e 0\n\nWhen walking through an inode extents, the ext4_ext_binsearch_idx() function\nassumes that the extent header has been previously validated.  However, there\nare no checks that verify that the number of entries (eh-\u003eeh_entries) is\nnon-zero when depth is \u003e 0.  And this will lead to problems because the\nEXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:\n\n[  135.245946] ------------[ cut here ]------------\n[  135.247579] kernel BUG at fs/ext4/extents.c:2258!\n[  135.249045] invalid opcode: 0000 [#1] PREEMPT SMP\n[  135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4\n[  135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n[  135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0\n[  135.256475] Code:\n[  135.261433] RSP: 0018:ffffc900005939f8 EFLAGS: 00010246\n[  135.262847] RAX: 0000000000000024 RBX: ffffc90000593b70 RCX: 0000000000000023\n[  135.264765] RDX: ffff8880038e5f10 RSI: 0000000000000003 RDI: ffff8880046e922c\n[  135.266670] RBP: ffff8880046e9348 R08: 0000000000000001 R09: ffff888002ca580c\n[  135.268576] R10: 0000000000002602 R11: 0000000000000000 R12: 0000000000000024\n[  135.270477] R13: 0000000000000000 R14: 0000000000000024 R15: 0000000000000000\n[  135.272394] FS:  00007fdabdc56740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000\n[  135.274510] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  135.276075] CR2: 00007ffc26bd4f00 CR3: 0000000006261004 CR4: 0000000000170ea0\n[  135.277952] Call Trace:\n[  135.278635]  \u003cTASK\u003e\n[  135.279247]  ? preempt_count_add+0x6d/0xa0\n[  135.280358]  ? percpu_counter_add_batch+0x55/0xb0\n[  135.281612]  ? _raw_read_unlock+0x18/0x30\n[  135.282704]  ext4_map_blocks+0x294/0x5a0\n[  135.283745]  ? xa_load+0x6f/0xa0\n[  135.284562]  ext4_mpage_readpages+0x3d6/0x770\n[  135.285646]  read_pages+0x67/0x1d0\n[  135.286492]  ? folio_add_lru+0x51/0x80\n[  135.287441]  page_cache_ra_unbounded+0x124/0x170\n[  135.288510]  filemap_get_pages+0x23d/0x5a0\n[  135.289457]  ? path_openat+0xa72/0xdd0\n[  135.290332]  filemap_read+0xbf/0x300\n[  135.291158]  ? _raw_spin_lock_irqsave+0x17/0x40\n[  135.292192]  new_sync_read+0x103/0x170\n[  135.293014]  vfs_read+0x15d/0x180\n[  135.293745]  ksys_read+0xa1/0xe0\n[  135.294461]  do_syscall_64+0x3c/0x80\n[  135.295284]  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThis patch simply adds an extra check in __ext4_ext_check(), verifying that\neh_entries is not 0 when eh_depth is \u003e 0."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T18:44:06.323Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0"
        },
        {
          "url": "https://git.kernel.org/stable/c/958b0ee23f5ac106e7cc11472b71aa2ea9a033bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/be4df018c0be5ebecf1ca510feacc23be415cefc"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f5e9de15e4f55fbf56f22d4a2ce406246cc462d"
        },
        {
          "url": "https://git.kernel.org/stable/c/29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0"
        }
      ],
      "title": "ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth \u003e 0",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48631",
    "datePublished": "2024-04-28T12:59:06.569Z",
    "dateReserved": "2024-02-25T13:44:28.315Z",
    "dateUpdated": "2026-05-11T18:44:06.323Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.