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CVE-2026-74351 (GCVE-0-2026-74351)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:17
VLAI
Title
ocfs2: rebase copied fsdlm LVB pointers in locking_state
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: rebase copied fsdlm LVB pointers in locking_state The locking_state debugfs iterator snapshots struct ocfs2_lock_res by value under ocfs2_dlm_tracking_lock and later formats that copy in ocfs2_dlm_seq_show(). That is fine for the inline fields, but the userspace fsdlm stack stores the LVB through lksb_fsdlm.sb_lvbptr. Once the iterator drops the tracking lock, a copied non-NULL sb_lvbptr still points into the original lockres owner, so teardown can free that container before the debugfs dump walks the raw LVB bytes. Rebase the copied sb_lvbptr to the copied l_lksb before dumping the raw LVB. The seq snapshot already carries the inline LVB storage reserved in struct ocfs2_dlm_lksb, so the debugfs reader can dump the copied bytes without borrowing the original lockres lifetime. The buggy scenario involves two paths, with each column showing the order within that path: locking_state reader: lockres teardown: 1. ocfs2_dlm_seq_start()/next() 1. file release or another owner copies struct ocfs2_lock_res teardown reaches 2. ocfs2_dlm_seq_show() formats ocfs2_lock_res_free() the copied row 2. the lockres is removed from the 3. ocfs2_dlm_lvb() follows the tracking list copied sb_lvbptr 3. the owner frees the original lockres container Validation reproduced this kernel report: KASAN slab-use-after-free in ocfs2_dlm_seq_show+0x1bd/0x430 RIP: 0033:0x7f8ec4b1e29d The buggy address belongs to the object at ffff88810a1e0800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 368 bytes inside of freed 1024-byte region [ffff88810a1e0800, ffff88810a1e0c00) Read of size 1 Call trace: dump_stack_lvl+0x66/0xa0 print_report+0xce/0x630 ocfs2_dlm_seq_show+0x1bd/0x430 (fs/ocfs2/dlmglue.c:3137) srso_alias_return_thunk+0x5/0xfbef5 __virt_addr_valid+0x19f/0x330 kasan_report+0xe0/0x110 seq_read_iter+0x29d/0x790 seq_read+0x20a/0x280 find_held_lock+0x2b/0x80 rcu_read_unlock+0x18/0x70 full_proxy_read+0x9e/0xd0 vfs_read+0x12c/0x590 ksys_read+0xd2/0x170 do_user_addr_fault+0x65a/0x890 do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87) entry_SYSCALL_64_after_hwframe+0x77/0x7f Allocated by task stack: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 __kasan_kmalloc+0xaa/0xb0 ocfs2_file_open+0x13e/0x300 do_dentry_open+0x233/0x7f0 vfs_open+0x5a/0x1b0 path_openat+0x66d/0x1540 do_file_open+0x186/0x2b0 do_sys_openat2+0xce/0x150 __x64_sys_openat+0xd0/0x140 do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87) entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task stack: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3b/0x60 __kasan_slab_free+0x5f/0x80 kfree+0x313/0x590 ocfs2_file_release+0x138/0x260 __fput+0x1df/0x4b0 fput_close_sync+0xd2/0x170 __x64_sys_close+0x55/0x90 do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87) entry_SYSCALL_64_after_hwframe+0x77/0x7f
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cf4d8d75d8aba537a19b313a9364fd08ddbd5622 , < 185427b5f7a209254c85c18aad5a4a8e009b2f30 (git)
Affected: cf4d8d75d8aba537a19b313a9364fd08ddbd5622 , < 07aa4a8ebacde3d0ba50f60d2964f274ee7629bc (git)
Affected: cf4d8d75d8aba537a19b313a9364fd08ddbd5622 , < e037c1250cc90e7aacb002357d1b0399fc65ecfc (git)
Affected: cf4d8d75d8aba537a19b313a9364fd08ddbd5622 , < 6b38a5b8ee951e5b244e9a3c3d28d0f5e7c51411 (git)
Affected: cf4d8d75d8aba537a19b313a9364fd08ddbd5622 , < 8614a8f7e81edd34c9f67e454e7024fd12a2a341 (git)
Affected: cf4d8d75d8aba537a19b313a9364fd08ddbd5622 , < bb44a7690a4d553da705919cf666a80f5ca9011c (git)
Affected: cf4d8d75d8aba537a19b313a9364fd08ddbd5622 , < 610a0d2a35496738e1472fb0f318d5008a1c634f (git)
Affected: cf4d8d75d8aba537a19b313a9364fd08ddbd5622 , < 93612d48fa42b3d1a637eb9279e15281c611c000 (git)
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Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: rebase copied fsdlm LVB pointers in locking_state\n\nThe locking_state debugfs iterator snapshots struct ocfs2_lock_res by\nvalue under ocfs2_dlm_tracking_lock and later formats that copy in\nocfs2_dlm_seq_show().  That is fine for the inline fields, but the\nuserspace fsdlm stack stores the LVB through lksb_fsdlm.sb_lvbptr.  Once\nthe iterator drops the tracking lock, a copied non-NULL sb_lvbptr still\npoints into the original lockres owner, so teardown can free that\ncontainer before the debugfs dump walks the raw LVB bytes.\n\nRebase the copied sb_lvbptr to the copied l_lksb before dumping the raw\nLVB.  The seq snapshot already carries the inline LVB storage reserved in\nstruct ocfs2_dlm_lksb, so the debugfs reader can dump the copied bytes\nwithout borrowing the original lockres lifetime.\n\nThe buggy scenario involves two paths, with each column showing the order\nwithin that path:\n\nlocking_state reader:                  lockres teardown:\n1. ocfs2_dlm_seq_start()/next()        1. file release or another owner\n   copies struct ocfs2_lock_res           teardown reaches\n2. ocfs2_dlm_seq_show() formats           ocfs2_lock_res_free()\n   the copied row                      2. the lockres is removed from the\n3. ocfs2_dlm_lvb() follows the            tracking list\n   copied sb_lvbptr                   3. the owner frees the original\n                                          lockres container\n\nValidation reproduced this kernel report:\nKASAN slab-use-after-free in ocfs2_dlm_seq_show+0x1bd/0x430\nRIP: 0033:0x7f8ec4b1e29d\nThe buggy address belongs to the object at ffff88810a1e0800 which belongs\nto the cache kmalloc-1k of size 1024\nThe buggy address is located 368 bytes inside of freed 1024-byte region\n[ffff88810a1e0800, ffff88810a1e0c00)\nRead of size 1\nCall trace:\n  dump_stack_lvl+0x66/0xa0\n  print_report+0xce/0x630\n  ocfs2_dlm_seq_show+0x1bd/0x430 (fs/ocfs2/dlmglue.c:3137)\n  srso_alias_return_thunk+0x5/0xfbef5\n  __virt_addr_valid+0x19f/0x330\n  kasan_report+0xe0/0x110\n  seq_read_iter+0x29d/0x790\n  seq_read+0x20a/0x280\n  find_held_lock+0x2b/0x80\n  rcu_read_unlock+0x18/0x70\n  full_proxy_read+0x9e/0xd0\n  vfs_read+0x12c/0x590\n  ksys_read+0xd2/0x170\n  do_user_addr_fault+0x65a/0x890\n  do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\nAllocated by task stack:\n  kasan_save_stack+0x33/0x60\n  kasan_save_track+0x14/0x30\n  __kasan_kmalloc+0xaa/0xb0\n  ocfs2_file_open+0x13e/0x300\n  do_dentry_open+0x233/0x7f0\n  vfs_open+0x5a/0x1b0\n  path_openat+0x66d/0x1540\n  do_file_open+0x186/0x2b0\n  do_sys_openat2+0xce/0x150\n  __x64_sys_openat+0xd0/0x140\n  do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\nFreed by task stack:\n  kasan_save_stack+0x33/0x60\n  kasan_save_track+0x14/0x30\n  kasan_save_free_info+0x3b/0x60\n  __kasan_slab_free+0x5f/0x80\n  kfree+0x313/0x590\n  ocfs2_file_release+0x138/0x260\n  __fput+0x1df/0x4b0\n  fput_close_sync+0xd2/0x170\n  __x64_sys_close+0x55/0x90\n  do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:17:44.780Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/185427b5f7a209254c85c18aad5a4a8e009b2f30"
        },
        {
          "url": "https://git.kernel.org/stable/c/07aa4a8ebacde3d0ba50f60d2964f274ee7629bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/e037c1250cc90e7aacb002357d1b0399fc65ecfc"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b38a5b8ee951e5b244e9a3c3d28d0f5e7c51411"
        },
        {
          "url": "https://git.kernel.org/stable/c/8614a8f7e81edd34c9f67e454e7024fd12a2a341"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb44a7690a4d553da705919cf666a80f5ca9011c"
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        {
          "url": "https://git.kernel.org/stable/c/610a0d2a35496738e1472fb0f318d5008a1c634f"
        },
        {
          "url": "https://git.kernel.org/stable/c/93612d48fa42b3d1a637eb9279e15281c611c000"
        }
      ],
      "title": "ocfs2: rebase copied fsdlm LVB pointers in locking_state",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74351",
    "datePublished": "2026-08-15T05:58:37.967Z",
    "dateReserved": "2026-08-15T05:44:03.886Z",
    "dateUpdated": "2026-08-17T05:17:44.780Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74351",
      "date": "2026-09-04",
      "epss": "0.00177",
      "percentile": "0.0727"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74351\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:36.383\",\"lastModified\":\"2026-08-17T06:19:29.780\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: rebase copied fsdlm LVB pointers in locking_state\\n\\nThe locking_state debugfs iterator snapshots struct ocfs2_lock_res by\\nvalue under ocfs2_dlm_tracking_lock and later formats that copy in\\nocfs2_dlm_seq_show().  That is fine for the inline fields, but the\\nuserspace fsdlm stack stores the LVB through lksb_fsdlm.sb_lvbptr.  Once\\nthe iterator drops the tracking lock, a copied non-NULL sb_lvbptr still\\npoints into the original lockres owner, so teardown can free that\\ncontainer before the debugfs dump walks the raw LVB bytes.\\n\\nRebase the copied sb_lvbptr to the copied l_lksb before dumping the raw\\nLVB.  The seq snapshot already carries the inline LVB storage reserved in\\nstruct ocfs2_dlm_lksb, so the debugfs reader can dump the copied bytes\\nwithout borrowing the original lockres lifetime.\\n\\nThe buggy scenario involves two paths, with each column showing the order\\nwithin that path:\\n\\nlocking_state reader:                  lockres teardown:\\n1. ocfs2_dlm_seq_start()/next()        1. file release or another owner\\n   copies struct ocfs2_lock_res           teardown reaches\\n2. ocfs2_dlm_seq_show() formats           ocfs2_lock_res_free()\\n   the copied row                      2. the lockres is removed from the\\n3. ocfs2_dlm_lvb() follows the            tracking list\\n   copied sb_lvbptr                   3. the owner frees the original\\n                                          lockres container\\n\\nValidation reproduced this kernel report:\\nKASAN slab-use-after-free in ocfs2_dlm_seq_show+0x1bd/0x430\\nRIP: 0033:0x7f8ec4b1e29d\\nThe buggy address belongs to the object at ffff88810a1e0800 which belongs\\nto the cache kmalloc-1k of size 1024\\nThe buggy address is located 368 bytes inside of freed 1024-byte region\\n[ffff88810a1e0800, ffff88810a1e0c00)\\nRead of size 1\\nCall trace:\\n  dump_stack_lvl+0x66/0xa0\\n  print_report+0xce/0x630\\n  ocfs2_dlm_seq_show+0x1bd/0x430 (fs/ocfs2/dlmglue.c:3137)\\n  srso_alias_return_thunk+0x5/0xfbef5\\n  __virt_addr_valid+0x19f/0x330\\n  kasan_report+0xe0/0x110\\n  seq_read_iter+0x29d/0x790\\n  seq_read+0x20a/0x280\\n  find_held_lock+0x2b/0x80\\n  rcu_read_unlock+0x18/0x70\\n  full_proxy_read+0x9e/0xd0\\n  vfs_read+0x12c/0x590\\n  ksys_read+0xd2/0x170\\n  do_user_addr_fault+0x65a/0x890\\n  do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nAllocated by task stack:\\n  kasan_save_stack+0x33/0x60\\n  kasan_save_track+0x14/0x30\\n  __kasan_kmalloc+0xaa/0xb0\\n  ocfs2_file_open+0x13e/0x300\\n  do_dentry_open+0x233/0x7f0\\n  vfs_open+0x5a/0x1b0\\n  path_openat+0x66d/0x1540\\n  do_file_open+0x186/0x2b0\\n  do_sys_openat2+0xce/0x150\\n  __x64_sys_openat+0xd0/0x140\\n  do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nFreed by task stack:\\n  kasan_save_stack+0x33/0x60\\n  kasan_save_track+0x14/0x30\\n  kasan_save_free_info+0x3b/0x60\\n  __kasan_slab_free+0x5f/0x80\\n  kfree+0x313/0x590\\n  ocfs2_file_release+0x138/0x260\\n  __fput+0x1df/0x4b0\\n  fput_close_sync+0xd2/0x170\\n  __x64_sys_close+0x55/0x90\\n  do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)\\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/dlmglue.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"cf4d8d75d8aba537a19b313a9364fd08ddbd5622\",\"lessThan\":\"185427b5f7a209254c85c18aad5a4a8e009b2f30\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cf4d8d75d8aba537a19b313a9364fd08ddbd5622\",\"lessThan\":\"07aa4a8ebacde3d0ba50f60d2964f274ee7629bc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cf4d8d75d8aba537a19b313a9364fd08ddbd5622\",\"lessThan\":\"e037c1250cc90e7aacb002357d1b0399fc65ecfc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cf4d8d75d8aba537a19b313a9364fd08ddbd5622\",\"lessThan\":\"6b38a5b8ee951e5b244e9a3c3d28d0f5e7c51411\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cf4d8d75d8aba537a19b313a9364fd08ddbd5622\",\"lessThan\":\"8614a8f7e81edd34c9f67e454e7024fd12a2a341\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cf4d8d75d8aba537a19b313a9364fd08ddbd5622\",\"lessThan\":\"bb44a7690a4d553da705919cf666a80f5ca9011c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cf4d8d75d8aba537a19b313a9364fd08ddbd5622\",\"lessThan\":\"610a0d2a35496738e1472fb0f318d5008a1c634f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cf4d8d75d8aba537a19b313a9364fd08ddbd5622\",\"lessThan\":\"93612d48fa42b3d1a637eb9279e15281c611c000\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/dlmglue.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.26\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.26\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07aa4a8ebacde3d0ba50f60d2964f274ee7629bc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/185427b5f7a209254c85c18aad5a4a8e009b2f30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/610a0d2a35496738e1472fb0f318d5008a1c634f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6b38a5b8ee951e5b244e9a3c3d28d0f5e7c51411\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8614a8f7e81edd34c9f67e454e7024fd12a2a341\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/93612d48fa42b3d1a637eb9279e15281c611c000\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb44a7690a4d553da705919cf666a80f5ca9011c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e037c1250cc90e7aacb002357d1b0399fc65ecfc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T20:53:10+00:00",
      "cve": "CVE-2026-74351",
      "id": "CVE-2026-74351",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ocfs2: rebase copied fsdlm LVB pointers in locking_state",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74351.json",
      "version": "3"
    }
  }
}



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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.