{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74351","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.886Z","datePublished":"2026-08-15T05:58:37.967Z","dateUpdated":"2026-08-17T05:17:44.780Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:17:44.780Z"},"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":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/dlmglue.c"],"versions":[{"version":"cf4d8d75d8aba537a19b313a9364fd08ddbd5622","lessThan":"185427b5f7a209254c85c18aad5a4a8e009b2f30","status":"affected","versionType":"git"},{"version":"cf4d8d75d8aba537a19b313a9364fd08ddbd5622","lessThan":"07aa4a8ebacde3d0ba50f60d2964f274ee7629bc","status":"affected","versionType":"git"},{"version":"cf4d8d75d8aba537a19b313a9364fd08ddbd5622","lessThan":"e037c1250cc90e7aacb002357d1b0399fc65ecfc","status":"affected","versionType":"git"},{"version":"cf4d8d75d8aba537a19b313a9364fd08ddbd5622","lessThan":"6b38a5b8ee951e5b244e9a3c3d28d0f5e7c51411","status":"affected","versionType":"git"},{"version":"cf4d8d75d8aba537a19b313a9364fd08ddbd5622","lessThan":"8614a8f7e81edd34c9f67e454e7024fd12a2a341","status":"affected","versionType":"git"},{"version":"cf4d8d75d8aba537a19b313a9364fd08ddbd5622","lessThan":"bb44a7690a4d553da705919cf666a80f5ca9011c","status":"affected","versionType":"git"},{"version":"cf4d8d75d8aba537a19b313a9364fd08ddbd5622","lessThan":"610a0d2a35496738e1472fb0f318d5008a1c634f","status":"affected","versionType":"git"},{"version":"cf4d8d75d8aba537a19b313a9364fd08ddbd5622","lessThan":"93612d48fa42b3d1a637eb9279e15281c611c000","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/dlmglue.c"],"versions":[{"version":"2.6.26","status":"affected"},{"version":"0","lessThan":"2.6.26","status":"unaffected","versionType":"semver"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"7.2"}]}]}],"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"},{"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","x_generator":{"engine":"bippy-1.2.0"}}}}