{"id":"CVE-2026-72375","state":"PUBLISHED","title":"afs: Fix reinitialisation of the inode, in particular ->lock_work","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix reinitialisation of the inode, in particular ->lock_work\n\nIt seems that initalising afs_vnode::lock_work a single time in the slab's\ninit function isn't sufficient for work_structs.  This results in the\nDEBUG_OBJECTS debugging stuff producing a warning occasionally when running\nthe generic/131 xfstest:\n\n ODEBUG: activate not available (active state 0) object: 0000000016d8760f object type: work_struct hint: afs_lock_work+0x0/0x220\n WARNING: lib/debugobjects.c:629 at debug_print_object+0x4b/0x90, CPU#3: locktest/7695\n ...\n CPU: 3 UID: 0 PID: 7695 Comm: locktest Tainted: G S                  7.1.0-build3+ #2771 PREEMPT\n ...\n RIP: 0010:debug_print_object+0x65/0x90\n ...\n Call Trace:\n  <TASK>\n  ? __pfx_afs_lock_work+0x10/0x10\n  debug_object_activate+0x122/0x170\n  insert_work+0x25/0x60\n  __queue_work+0x2e0/0x340\n  queue_delayed_work_on+0x48/0x70\n  afs_fl_release_private+0x57/0x70\n  locks_release_private+0x5c/0xa0\n  locks_free_lock+0xe/0x20\n  posix_lock_inode+0x55f/0x5b0\n  locks_lock_inode_wait+0x81/0x140\n  ? file_write_and_wait_range+0x50/0x70\n  afs_lock+0xcd/0x110\n  fcntl_setlk+0x10d/0x260\n  do_fcntl+0x24e/0x5b0\n  __do_sys_fcntl+0x6a/0x90\n  do_syscall_64+0x11e/0x310\n  entry_SYSCALL_64_after_hwframe+0x71/0x79\n\nFix this by reinitialising ->lock_work after allocating an inode.\n\nAlso, flush ->lock_work when the inode is being evicted to make sure it's\nnot still running.","publishedAt":"2026-08-15T05:56:09.790Z","updatedAt":"2026-10-30T12:29:10.338Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"1471eef04c074029e2512a36e4d37d8547ff9762","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"2e7888bb635d9bc84359491347b236cc232ca4df","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"34dff35154e2fb3987ec5e0b40def14c64eadeb1","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"63d3f283858fae097fb09ddd4ce46bb0bc1f9d01","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"5597fbd1e7c161914f20315a726e54025b0fdadb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/inode.c","fs/afs/super.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.23","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.23","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/inode.c","fs/afs/super.c"]}],"references":["https://git.kernel.org/stable/c/1471eef04c074029e2512a36e4d37d8547ff9762","https://git.kernel.org/stable/c/2e7888bb635d9bc84359491347b236cc232ca4df","https://git.kernel.org/stable/c/34dff35154e2fb3987ec5e0b40def14c64eadeb1","https://git.kernel.org/stable/c/63d3f283858fae097fb09ddd4ce46bb0bc1f9d01","https://git.kernel.org/stable/c/ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28","https://git.kernel.org/stable/c/5597fbd1e7c161914f20315a726e54025b0fdadb"],"weaknesses":[],"ingestedAt":"2026-10-30T12:48:04.825Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72375.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72375","state":"PUBLISHED","datePublished":"2026-08-15T05:56:09.790Z","dateUpdated":"2026-10-30T12:29:10.338Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.922Z"},"containers":{"cna":{"title":"afs: Fix reinitialisation of the inode, in particular ->lock_work","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix reinitialisation of the inode, in particular ->lock_work\n\nIt seems that initalising afs_vnode::lock_work a single time in the slab's\ninit function isn't sufficient for work_structs.  This results in the\nDEBUG_OBJECTS debugging stuff producing a warning occasionally when running\nthe generic/131 xfstest:\n\n ODEBUG: activate not available (active state 0) object: 0000000016d8760f object type: work_struct hint: afs_lock_work+0x0/0x220\n WARNING: lib/debugobjects.c:629 at debug_print_object+0x4b/0x90, CPU#3: locktest/7695\n ...\n CPU: 3 UID: 0 PID: 7695 Comm: locktest Tainted: G S                  7.1.0-build3+ #2771 PREEMPT\n ...\n RIP: 0010:debug_print_object+0x65/0x90\n ...\n Call Trace:\n  <TASK>\n  ? __pfx_afs_lock_work+0x10/0x10\n  debug_object_activate+0x122/0x170\n  insert_work+0x25/0x60\n  __queue_work+0x2e0/0x340\n  queue_delayed_work_on+0x48/0x70\n  afs_fl_release_private+0x57/0x70\n  locks_release_private+0x5c/0xa0\n  locks_free_lock+0xe/0x20\n  posix_lock_inode+0x55f/0x5b0\n  locks_lock_inode_wait+0x81/0x140\n  ? file_write_and_wait_range+0x50/0x70\n  afs_lock+0xcd/0x110\n  fcntl_setlk+0x10d/0x260\n  do_fcntl+0x24e/0x5b0\n  __do_sys_fcntl+0x6a/0x90\n  do_syscall_64+0x11e/0x310\n  entry_SYSCALL_64_after_hwframe+0x71/0x79\n\nFix this by reinitialising ->lock_work after allocating an inode.\n\nAlso, flush ->lock_work when the inode is being evicted to make sure it's\nnot still running."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"1471eef04c074029e2512a36e4d37d8547ff9762","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"2e7888bb635d9bc84359491347b236cc232ca4df","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"34dff35154e2fb3987ec5e0b40def14c64eadeb1","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"63d3f283858fae097fb09ddd4ce46bb0bc1f9d01","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","status":"affected","lessThan":"5597fbd1e7c161914f20315a726e54025b0fdadb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/inode.c","fs/afs/super.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.23","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.23","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/inode.c","fs/afs/super.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1471eef04c074029e2512a36e4d37d8547ff9762"},{"url":"https://git.kernel.org/stable/c/2e7888bb635d9bc84359491347b236cc232ca4df"},{"url":"https://git.kernel.org/stable/c/34dff35154e2fb3987ec5e0b40def14c64eadeb1"},{"url":"https://git.kernel.org/stable/c/63d3f283858fae097fb09ddd4ce46bb0bc1f9d01"},{"url":"https://git.kernel.org/stable/c/ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28"},{"url":"https://git.kernel.org/stable/c/5597fbd1e7c161914f20315a726e54025b0fdadb"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached only via the local VFS file-locking path (fcntl/F_SETLK/F_SETLKW → afs_lock → afs_fl_release_private → queue_delayed_work on vnode->lock_work), not from inbound AFS/RxRPC network packet handling.\nAC:L - An attacker can reliably drive the fault by cycling POSIX locks and inode eviction/reuse on AFS files they control; both sides of the workqueue/slab race are attacker-influenced and freely retryable, matching the intermittent generic/131 locktest reproducer.\nPR:L - On the highest-impact deployment (enterprise/university hosts with AFS already mounted), any unprivileged local user who can open files on that mount can trigger fcntl locking without real root or CAP_SYS_ADMIN in the init namespace.\nUI:N - Exploitation requires no action by another user; the attacker directly issues fcntl lock/unlock operations on file descriptors they hold on the shared AFS mount.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security boundary; this is not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Stale lock_work reuse and eviction without flush_delayed_work() can leave afs_lock_work operating on freed/reallocated afs_vnode slab memory, a classic use-after-free that can disclose or corrupt adjacent kernel heap contents.\nI:H - Corrupting or re-queuing a stale delayed_work can corrupt workqueue lists and attacker-controlled vnode fields, providing primitives consistent with arbitrary kernel write and control-flow hijack, not merely a benign warning.\nA:H - Invalid work_struct state triggers kernel warnings/oops in testing and can panic the system when deferred lock work runs against an evicted inode or poisoned slab object during normal lock release."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:29:10.338Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-72375","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:48:13.426490Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T18:55:20.832Z"}}]}}}