{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72375","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.922Z","datePublished":"2026-08-15T05:56:09.790Z","dateUpdated":"2026-08-17T05:43:28.699Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:43:28.699Z"},"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."}],"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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/afs/inode.c","fs/afs/super.c"],"versions":[{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","lessThan":"63d3f283858fae097fb09ddd4ce46bb0bc1f9d01","status":"affected","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","lessThan":"ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28","status":"affected","versionType":"git"},{"version":"e8d6c554126b830217c5e9f549e0e21f865a0a8a","lessThan":"5597fbd1e7c161914f20315a726e54025b0fdadb","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/afs/inode.c","fs/afs/super.c"],"versions":[{"version":"2.6.23","status":"affected"},{"version":"0","lessThan":"2.6.23","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":"2.6.23","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"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/63d3f283858fae097fb09ddd4ce46bb0bc1f9d01"},{"url":"https://git.kernel.org/stable/c/ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28"},{"url":"https://git.kernel.org/stable/c/5597fbd1e7c161914f20315a726e54025b0fdadb"}],"title":"afs: Fix reinitialisation of the inode, in particular ->lock_work","x_generator":{"engine":"bippy-1.2.0"}}}}