CVE-2026-74722 (GCVE-0-2026-74722)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-22 15:33
VLAI
Title
btrfs: fix memory leak in btrfs_do_encoded_write()
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix memory leak in btrfs_do_encoded_write() Local fuzzing of 6.12.94 has found the following memory leak: Unreferenced object 0xffff888018050a80 (size 64): comm "syz.0.17", pid 10297, jiffies 4294953601 hex dump (first 32 bytes): 00 10 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................ 10 0a 05 18 80 88 ff ff 10 0a 05 18 80 88 ff ff ................ backtrace (crc a8a6fc29): kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline] slab_post_alloc_hook mm/slub.c:4152 [inline] slab_alloc_node mm/slub.c:4197 [inline] __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358 kmalloc_noprof include/linux/slab.h:878 [inline] extent_changeset_alloc fs/btrfs/extent_io.h:207 [inline] qgroup_reserve_data+0x1c5/0x7d0 fs/btrfs/qgroup.c:4305 btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355 btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746 btrfs_encoded_write fs/btrfs/file.c:1482 [inline] btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507 btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738 btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x77/0x7f Unreferenced object 0xffff888018050a00 (size 64): comm "syz.0.17", pid 10297, jiffies 4294953601 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 ff 0f 00 00 00 00 00 00 ................ 90 0a 05 18 80 88 ff ff 90 0a 05 18 80 88 ff ff ................ backtrace (crc cb5c9580): kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline] slab_post_alloc_hook mm/slub.c:4152 [inline] slab_alloc_node mm/slub.c:4197 [inline] __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] ulist_prealloc+0x9c/0x110 fs/btrfs/ulist.c:114 extent_changeset_prealloc fs/btrfs/extent_io.h:217 [inline] __set_extent_bit+0x16b/0x1a70 fs/btrfs/extent-io-tree.c:1086 set_record_extent_bits+0x50/0x90 fs/btrfs/extent-io-tree.c:1821 qgroup_reserve_data+0x274/0x7d0 fs/btrfs/qgroup.c:4312 btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355 btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746 btrfs_encoded_write fs/btrfs/file.c:1482 [inline] btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507 btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738 btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x77/0x7f Fix this by freeing an extent changeset before returning from btrfs_do_encoded_write().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < 0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0 (git)
Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47 (git)
Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < 20c0eeb4313f9f89d47b80b672b5846f9827cb31 (git)
Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < 24a8f2c29aebb753ccb962fbb25bae18d7978f6e (git)
Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < 60b50ceba6243802f8d2c0a9a7c2d549a93b1d64 (git)
Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < d2a4e4e626b2f4670b69b430c357f03f53eb6632 (git)
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Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix memory leak in btrfs_do_encoded_write()\n\nLocal fuzzing of 6.12.94 has found the following memory leak:\n\nUnreferenced object 0xffff888018050a80 (size 64):\n  comm \"syz.0.17\", pid 10297, jiffies 4294953601\n  hex dump (first 32 bytes):\n    00 10 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................\n    10 0a 05 18 80 88 ff ff 10 0a 05 18 80 88 ff ff  ................\n  backtrace (crc a8a6fc29):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n    slab_post_alloc_hook mm/slub.c:4152 [inline]\n    slab_alloc_node mm/slub.c:4197 [inline]\n    __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n    kmalloc_noprof include/linux/slab.h:878 [inline]\n    extent_changeset_alloc fs/btrfs/extent_io.h:207 [inline]\n    qgroup_reserve_data+0x1c5/0x7d0 fs/btrfs/qgroup.c:4305\n    btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n    btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n    btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n    btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n    btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n    btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n    vfs_ioctl fs/ioctl.c:51 [inline]\n    __do_sys_ioctl fs/ioctl.c:906 [inline]\n    __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n    do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n    do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUnreferenced object 0xffff888018050a00 (size 64):\n  comm \"syz.0.17\", pid 10297, jiffies 4294953601\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 ff 0f 00 00 00 00 00 00  ................\n    90 0a 05 18 80 88 ff ff 90 0a 05 18 80 88 ff ff  ................\n  backtrace (crc cb5c9580):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n    slab_post_alloc_hook mm/slub.c:4152 [inline]\n    slab_alloc_node mm/slub.c:4197 [inline]\n    __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n    kmalloc_noprof include/linux/slab.h:878 [inline]\n    kzalloc_noprof include/linux/slab.h:1014 [inline]\n    ulist_prealloc+0x9c/0x110 fs/btrfs/ulist.c:114\n    extent_changeset_prealloc fs/btrfs/extent_io.h:217 [inline]\n    __set_extent_bit+0x16b/0x1a70 fs/btrfs/extent-io-tree.c:1086\n    set_record_extent_bits+0x50/0x90 fs/btrfs/extent-io-tree.c:1821\n    qgroup_reserve_data+0x274/0x7d0 fs/btrfs/qgroup.c:4312\n    btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n    btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n    btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n    btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n    btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n    btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n    vfs_ioctl fs/ioctl.c:51 [inline]\n    __do_sys_ioctl fs/ioctl.c:906 [inline]\n    __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n    do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n    do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFix this by freeing an extent changeset before returning from\nbtrfs_do_encoded_write()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:33:14.582Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47"
        },
        {
          "url": "https://git.kernel.org/stable/c/20c0eeb4313f9f89d47b80b672b5846f9827cb31"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/60b50ceba6243802f8d2c0a9a7c2d549a93b1d64"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2a4e4e626b2f4670b69b430c357f03f53eb6632"
        }
      ],
      "title": "btrfs: fix memory leak in btrfs_do_encoded_write()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74722",
    "datePublished": "2026-08-22T15:33:14.582Z",
    "dateReserved": "2026-08-15T05:44:03.929Z",
    "dateUpdated": "2026-08-22T15:33:14.582Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74722",
      "date": "2026-09-21",
      "epss": "0.00173",
      "percentile": "0.06993"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:52:44.000Z",
      "cve": "CVE-2026-74722",
      "id": "msrc_CVE-2026-74722",
      "initial_release_date": "2026-08-24T01:10:28.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "btrfs: fix memory leak in btrfs_do_encoded_write()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74722.json",
      "version": "3"
    },
    "nvd": {
      "cve": {
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix memory leak in btrfs_do_encoded_write()\n\nLocal fuzzing of 6.12.94 has found the following memory leak:\n\nUnreferenced object 0xffff888018050a80 (size 64):\n  comm \"syz.0.17\", pid 10297, jiffies 4294953601\n  hex dump (first 32 bytes):\n    00 10 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................\n    10 0a 05 18 80 88 ff ff 10 0a 05 18 80 88 ff ff  ................\n  backtrace (crc a8a6fc29):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n    slab_post_alloc_hook mm/slub.c:4152 [inline]\n    slab_alloc_node mm/slub.c:4197 [inline]\n    __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n    kmalloc_noprof include/linux/slab.h:878 [inline]\n    extent_changeset_alloc fs/btrfs/extent_io.h:207 [inline]\n    qgroup_reserve_data+0x1c5/0x7d0 fs/btrfs/qgroup.c:4305\n    btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n    btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n    btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n    btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n    btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n    btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n    vfs_ioctl fs/ioctl.c:51 [inline]\n    __do_sys_ioctl fs/ioctl.c:906 [inline]\n    __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n    do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n    do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUnreferenced object 0xffff888018050a00 (size 64):\n  comm \"syz.0.17\", pid 10297, jiffies 4294953601\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 ff 0f 00 00 00 00 00 00  ................\n    90 0a 05 18 80 88 ff ff 90 0a 05 18 80 88 ff ff  ................\n  backtrace (crc cb5c9580):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n    slab_post_alloc_hook mm/slub.c:4152 [inline]\n    slab_alloc_node mm/slub.c:4197 [inline]\n    __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n    kmalloc_noprof include/linux/slab.h:878 [inline]\n    kzalloc_noprof include/linux/slab.h:1014 [inline]\n    ulist_prealloc+0x9c/0x110 fs/btrfs/ulist.c:114\n    extent_changeset_prealloc fs/btrfs/extent_io.h:217 [inline]\n    __set_extent_bit+0x16b/0x1a70 fs/btrfs/extent-io-tree.c:1086\n    set_record_extent_bits+0x50/0x90 fs/btrfs/extent-io-tree.c:1821\n    qgroup_reserve_data+0x274/0x7d0 fs/btrfs/qgroup.c:4312\n    btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n    btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n    btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n    btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n    btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n    btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n    vfs_ioctl fs/ioctl.c:51 [inline]\n    __do_sys_ioctl fs/ioctl.c:906 [inline]\n    __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n    do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n    do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFix this by freeing an extent changeset before returning from\nbtrfs_do_encoded_write()."
          }
        ],
        "id": "CVE-2026-74722",
        "lastModified": "2026-08-22T16:16:47.183",
        "metrics": {},
        "published": "2026-08-22T16:16:47.183",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/20c0eeb4313f9f89d47b80b672b5846f9827cb31"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/24a8f2c29aebb753ccb962fbb25bae18d7978f6e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/60b50ceba6243802f8d2c0a9a7c2d549a93b1d64"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d2a4e4e626b2f4670b69b430c357f03f53eb6632"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-25T10:02:45+00:00",
      "cve": "CVE-2026-74722",
      "id": "CVE-2026-74722",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: btrfs: fix memory leak in btrfs_do_encoded_write()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74722.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:25:59Z",
      "cve": "CVE-2026-74722",
      "id": "CVE-2026-74722",
      "initial_release_date": "2026-08-23T00:03:56Z",
      "product_status:known_affected": "475",
      "product_status:known_not_affected": "239",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74722",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74722.json",
      "version": "10"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.