CVE-2022-50755 (GCVE-0-2022-50755)
Vulnerability from cvelistv5
Published
2025-12-24 13:05
Modified
2026-10-15 21:41
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: udf: Avoid double brelse() in udf_rename() syzbot reported a warning like below [1]: VFS: brelse: Trying to free free buffer WARNING: CPU: 2 PID: 7301 at fs/buffer.c:1145 __brelse+0x67/0xa0 ... Call Trace: <TASK> invalidate_bh_lru+0x99/0x150 smp_call_function_many_cond+0xe2a/0x10c0 ? generic_remap_file_range_prep+0x50/0x50 ? __brelse+0xa0/0xa0 ? __mutex_lock+0x21c/0x12d0 ? smp_call_on_cpu+0x250/0x250 ? rcu_read_lock_sched_held+0xb/0x60 ? lock_release+0x587/0x810 ? __brelse+0xa0/0xa0 ? generic_remap_file_range_prep+0x50/0x50 on_each_cpu_cond_mask+0x3c/0x80 blkdev_flush_mapping+0x13a/0x2f0 blkdev_put_whole+0xd3/0xf0 blkdev_put+0x222/0x760 deactivate_locked_super+0x96/0x160 deactivate_super+0xda/0x100 cleanup_mnt+0x222/0x3d0 task_work_run+0x149/0x240 ? task_work_cancel+0x30/0x30 do_exit+0xb29/0x2a40 ? reacquire_held_locks+0x4a0/0x4a0 ? do_raw_spin_lock+0x12a/0x2b0 ? mm_update_next_owner+0x7c0/0x7c0 ? rwlock_bug.part.0+0x90/0x90 ? zap_other_threads+0x234/0x2d0 do_group_exit+0xd0/0x2a0 __x64_sys_exit_group+0x3a/0x50 do_syscall_64+0x34/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd The cause of the issue is that brelse() is called on both ofibh.sbh and ofibh.ebh by udf_find_entry() when it returns NULL. However, brelse() is called by udf_rename(), too. So, b_count on buffer_head becomes unbalanced. This patch fixes the issue by not calling brelse() by udf_rename() when udf_find_entry() returns NULL.
References
Impacted products
Vendor Product Version
Linux Linux Version: 231473f6ddcef9c01993e0bfe36acc6f8e425c31
Version: 231473f6ddcef9c01993e0bfe36acc6f8e425c31
Version: 231473f6ddcef9c01993e0bfe36acc6f8e425c31
Version: 231473f6ddcef9c01993e0bfe36acc6f8e425c31
Version: 231473f6ddcef9c01993e0bfe36acc6f8e425c31
Version: 231473f6ddcef9c01993e0bfe36acc6f8e425c31
Version: 231473f6ddcef9c01993e0bfe36acc6f8e425c31
Version: 231473f6ddcef9c01993e0bfe36acc6f8e425c31
Version: 231473f6ddcef9c01993e0bfe36acc6f8e425c31
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: Avoid double brelse() in udf_rename()\n\nsyzbot reported a warning like below [1]:\n\nVFS: brelse: Trying to free free buffer\nWARNING: CPU: 2 PID: 7301 at fs/buffer.c:1145 __brelse+0x67/0xa0\n...\nCall Trace:\n \u003cTASK\u003e\n invalidate_bh_lru+0x99/0x150\n smp_call_function_many_cond+0xe2a/0x10c0\n ? generic_remap_file_range_prep+0x50/0x50\n ? __brelse+0xa0/0xa0\n ? __mutex_lock+0x21c/0x12d0\n ? smp_call_on_cpu+0x250/0x250\n ? rcu_read_lock_sched_held+0xb/0x60\n ? lock_release+0x587/0x810\n ? __brelse+0xa0/0xa0\n ? generic_remap_file_range_prep+0x50/0x50\n on_each_cpu_cond_mask+0x3c/0x80\n blkdev_flush_mapping+0x13a/0x2f0\n blkdev_put_whole+0xd3/0xf0\n blkdev_put+0x222/0x760\n deactivate_locked_super+0x96/0x160\n deactivate_super+0xda/0x100\n cleanup_mnt+0x222/0x3d0\n task_work_run+0x149/0x240\n ? task_work_cancel+0x30/0x30\n do_exit+0xb29/0x2a40\n ? reacquire_held_locks+0x4a0/0x4a0\n ? do_raw_spin_lock+0x12a/0x2b0\n ? mm_update_next_owner+0x7c0/0x7c0\n ? rwlock_bug.part.0+0x90/0x90\n ? zap_other_threads+0x234/0x2d0\n do_group_exit+0xd0/0x2a0\n __x64_sys_exit_group+0x3a/0x50\n do_syscall_64+0x34/0xb0\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe cause of the issue is that brelse() is called on both ofibh.sbh\nand ofibh.ebh by udf_find_entry() when it returns NULL.  However,\nbrelse() is called by udf_rename(), too.  So, b_count on buffer_head\nbecomes unbalanced.\n\nThis patch fixes the issue by not calling brelse() by udf_rename()\nwhen udf_find_entry() returns NULL."
        }
      ],
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            "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"
          },
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              "value": "AV:L - The bug is reached only through local rename(2)/renameat2 on a mounted UDF filesystem (vfs_rename \u2192 udf_rename \u2192 udf_find_entry); no network or adjacent protocol handler reaches this path.\nAC:L - A crafted UDF image that makes udf_find_entry() return NULL during rename (as in the syzbot C repro with controlled charset/options) deterministically double-brelse()s the directory buffer_heads with no race or attacker-uncontrollable condition.\nPR:L - UDF lacks FS_USERNS_MOUNT so raw mount needs CAP_SYS_ADMIN, but default UDisks/polkit policy lets an active unprivileged user mount removable UDF media and then rename on that volume, matching CVE-2026-64324.\nUI:N - The attacking local user can mount their own crafted UDF image via UDisks and issue rename themselves; no separate victim action is required.\nS:U - The buffer_head refcount underflow and resulting corruption stay inside the host kernel VFS/UDF authority; this is ordinary same-host kernel impact, not a VM/IOMMU/sandbox boundary cross.\nC:H - Double brelse() underflows a still-cached directory buffer_head reference, yielding a bh_cachep use-after-free whose recycled object contents (b_data, b_page, b_end_io) can be disclosed, consistent with CVE-2024-49882 double-brelse scoring.\nI:H - The same buffer_head UAF exposes b_end_io and list pointers for heap-spray write and control-flow hijack primitives, and can corrupt adjacent page-cache metadata buffers.\nA:H - The unbalanced b_count reproducibly hits WARN in __brelse() (fatal under panic_on_warn) and the resulting use-after-free can oops/panic the kernel during later invalidate/unmount, fully denying availability."
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        "dateUpdated": "2026-08-05T08:59:41.275Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/78eba2778ae10fb2a9d450e14d26eb6f6bf1f906"
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        {
          "url": "https://git.kernel.org/stable/c/9d2cad69547abea961fa80426d600b861de1952b"
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          "url": "https://git.kernel.org/stable/c/156d440dea97deada629bb51cb17887abd862605"
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          "url": "https://git.kernel.org/stable/c/c791730f2554a9ebb8f18df9368dc27d4ebc38c2"
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      "title": "udf: Avoid double brelse() in udf_rename()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50755",
    "datePublished": "2025-12-24T13:05:48.928Z",
    "dateReserved": "2025-12-24T13:02:21.544Z",
    "dateUpdated": "2026-10-15T21:41:23.768Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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handler reaches this path.\\nAC:L - A crafted UDF image that makes udf_find_entry() return NULL during rename (as in the syzbot C repro with controlled charset/options) deterministically double-brelse()s the directory buffer_heads with no race or attacker-uncontrollable condition.\\nPR:L - UDF lacks FS_USERNS_MOUNT so raw mount needs CAP_SYS_ADMIN, but default UDisks/polkit policy lets an active unprivileged user mount removable UDF media and then rename on that volume, matching CVE-2026-64324.\\nUI:N - The attacking local user can mount their own crafted UDF image via UDisks and issue rename themselves; no separate victim action is required.\\nS:U - The buffer_head refcount underflow and resulting corruption stay inside the host kernel VFS/UDF authority; this is ordinary same-host kernel impact, not a VM/IOMMU/sandbox boundary cross.\\nC:H - Double brelse() underflows a still-cached directory buffer_head reference, yielding a bh_cachep use-after-free whose recycled object contents (b_data, b_page, b_end_io) can be disclosed, consistent with CVE-2024-49882 double-brelse scoring.\\nI:H - The same buffer_head UAF exposes b_end_io and list pointers for heap-spray write and control-flow hijack primitives, and can corrupt adjacent page-cache metadata buffers.\\nA:H - The unbalanced b_count reproducibly hits WARN in __brelse() (fatal under panic_on_warn) and the resulting use-after-free can oops/panic the kernel during later invalidate/unmount, fully denying availability.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\", \"lessThan\": \"78eba2778ae10fb2a9d450e14d26eb6f6bf1f906\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\", \"lessThan\": \"9d2cad69547abea961fa80426d600b861de1952b\", \"versionType\": 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\"090bf49833c51da297ec74f98ad2bf44daea9311\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"231473f6ddcef9c01993e0bfe36acc6f8e425c31\", \"lessThan\": \"c791730f2554a9ebb8f18df9368dc27d4ebc38c2\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/udf/namei.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.9.337\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.303\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.270\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.229\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.163\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.86\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/udf/namei.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/78eba2778ae10fb2a9d450e14d26eb6f6bf1f906\"}, {\"url\": \"https://git.kernel.org/stable/c/9d2cad69547abea961fa80426d600b861de1952b\"}, {\"url\": \"https://git.kernel.org/stable/c/d6da7ec0f94f5208c848e0e94b70f54a0bd9c587\"}, {\"url\": \"https://git.kernel.org/stable/c/156d440dea97deada629bb51cb17887abd862605\"}, {\"url\": \"https://git.kernel.org/stable/c/40dba68d418237b1ae2beaa06d46a94dd946278e\"}, {\"url\": \"https://git.kernel.org/stable/c/e7a6a53c871460727be09f4414ccb29fb8697526\"}, {\"url\": \"https://git.kernel.org/stable/c/4fca09045509f5bde8fc28e68fbca38cb4bdcf2e\"}, {\"url\": \"https://git.kernel.org/stable/c/090bf49833c51da297ec74f98ad2bf44daea9311\"}, {\"url\": \"https://git.kernel.org/stable/c/c791730f2554a9ebb8f18df9368dc27d4ebc38c2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nudf: Avoid double brelse() in udf_rename()\\n\\nsyzbot reported a warning like below [1]:\\n\\nVFS: brelse: Trying to free free buffer\\nWARNING: CPU: 2 PID: 7301 at fs/buffer.c:1145 __brelse+0x67/0xa0\\n...\\nCall Trace:\\n \u003cTASK\u003e\\n invalidate_bh_lru+0x99/0x150\\n smp_call_function_many_cond+0xe2a/0x10c0\\n ? generic_remap_file_range_prep+0x50/0x50\\n ? __brelse+0xa0/0xa0\\n ? __mutex_lock+0x21c/0x12d0\\n ? smp_call_on_cpu+0x250/0x250\\n ? rcu_read_lock_sched_held+0xb/0x60\\n ? lock_release+0x587/0x810\\n ? __brelse+0xa0/0xa0\\n ? generic_remap_file_range_prep+0x50/0x50\\n on_each_cpu_cond_mask+0x3c/0x80\\n blkdev_flush_mapping+0x13a/0x2f0\\n blkdev_put_whole+0xd3/0xf0\\n blkdev_put+0x222/0x760\\n deactivate_locked_super+0x96/0x160\\n deactivate_super+0xda/0x100\\n cleanup_mnt+0x222/0x3d0\\n task_work_run+0x149/0x240\\n ? task_work_cancel+0x30/0x30\\n do_exit+0xb29/0x2a40\\n ? reacquire_held_locks+0x4a0/0x4a0\\n ? do_raw_spin_lock+0x12a/0x2b0\\n ? mm_update_next_owner+0x7c0/0x7c0\\n ? rwlock_bug.part.0+0x90/0x90\\n ? zap_other_threads+0x234/0x2d0\\n do_group_exit+0xd0/0x2a0\\n __x64_sys_exit_group+0x3a/0x50\\n do_syscall_64+0x34/0xb0\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nThe cause of the issue is that brelse() is called on both ofibh.sbh\\nand ofibh.ebh by udf_find_entry() when it returns NULL.  However,\\nbrelse() is called by udf_rename(), too.  So, b_count on buffer_head\\nbecomes unbalanced.\\n\\nThis patch fixes the issue by not calling brelse() by udf_rename()\\nwhen udf_find_entry() returns NULL.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.337\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.303\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.270\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.229\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.163\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.86\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.16\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.2\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"4.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:59:41.275Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-50755\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T21:41:23.768Z\", \"dateReserved\": \"2025-12-24T13:02:21.544Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-24T13:05:48.928Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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