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CVE-2026-72375 (GCVE-0-2026-72375)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
afs: Fix reinitialisation of the inode, in particular ->lock_work
Summary
In the Linux kernel, the following vulnerability has been resolved: afs: Fix reinitialisation of the inode, in particular ->lock_work It seems that initalising afs_vnode::lock_work a single time in the slab's init function isn't sufficient for work_structs. This results in the DEBUG_OBJECTS debugging stuff producing a warning occasionally when running the generic/131 xfstest: ODEBUG: activate not available (active state 0) object: 0000000016d8760f object type: work_struct hint: afs_lock_work+0x0/0x220 WARNING: lib/debugobjects.c:629 at debug_print_object+0x4b/0x90, CPU#3: locktest/7695 ... CPU: 3 UID: 0 PID: 7695 Comm: locktest Tainted: G S 7.1.0-build3+ #2771 PREEMPT ... RIP: 0010:debug_print_object+0x65/0x90 ... Call Trace: <TASK> ? __pfx_afs_lock_work+0x10/0x10 debug_object_activate+0x122/0x170 insert_work+0x25/0x60 __queue_work+0x2e0/0x340 queue_delayed_work_on+0x48/0x70 afs_fl_release_private+0x57/0x70 locks_release_private+0x5c/0xa0 locks_free_lock+0xe/0x20 posix_lock_inode+0x55f/0x5b0 locks_lock_inode_wait+0x81/0x140 ? file_write_and_wait_range+0x50/0x70 afs_lock+0xcd/0x110 fcntl_setlk+0x10d/0x260 do_fcntl+0x24e/0x5b0 __do_sys_fcntl+0x6a/0x90 do_syscall_64+0x11e/0x310 entry_SYSCALL_64_after_hwframe+0x71/0x79 Fix this by reinitialising ->lock_work after allocating an inode. Also, flush ->lock_work when the inode is being evicted to make sure it's not still running.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e8d6c554126b830217c5e9f549e0e21f865a0a8a , < 63d3f283858fae097fb09ddd4ce46bb0bc1f9d01 (git)
Affected: e8d6c554126b830217c5e9f549e0e21f865a0a8a , < ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28 (git)
Affected: e8d6c554126b830217c5e9f549e0e21f865a0a8a , < 5597fbd1e7c161914f20315a726e54025b0fdadb (git)
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Linux Linux Affected: 2.6.23
Unaffected: 0 , < 2.6.23 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/afs/inode.c",
            "fs/afs/super.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.23"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
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              "version": "7.1.5",
              "versionType": "semver"
            },
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              "version": "7.2",
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "2.6.23",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
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                  "vulnerable": true
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.23",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix reinitialisation of the inode, in particular -\u003elock_work\n\nIt seems that initalising afs_vnode::lock_work a single time in the slab\u0027s\ninit function isn\u0027t 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  \u003cTASK\u003e\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 -\u003elock_work after allocating an inode.\n\nAlso, flush -\u003elock_work when the inode is being evicted to make sure it\u0027s\nnot still running."
        }
      ],
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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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              "lang": "en",
              "value": "AV:L - The bug is reached only via the local VFS file-locking path (fcntl/F_SETLK/F_SETLKW \u2192 afs_lock \u2192 afs_fl_release_private \u2192 queue_delayed_work on vnode-\u003elock_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."
            }
          ]
        }
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        "dateUpdated": "2026-08-17T05:43:28.699Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/ebfd13c0367adb43d7c0a72f5cd7e004e60c6b28"
        },
        {
          "url": "https://git.kernel.org/stable/c/5597fbd1e7c161914f20315a726e54025b0fdadb"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72375",
    "datePublished": "2026-08-15T05:56:09.790Z",
    "dateReserved": "2026-08-09T03:40:39.922Z",
    "dateUpdated": "2026-08-17T05:43:28.699Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72375",
      "date": "2026-09-10",
      "epss": "0.00173",
      "percentile": "0.06911"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-23T15:02:54.000Z",
      "cve": "CVE-2026-72375",
      "id": "msrc_CVE-2026-72375",
      "initial_release_date": "2026-08-23T15:02:54.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "afs: Fix reinitialisation of the inode, in particular -\u003elock_work",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-72375.json",
      "version": "1"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T12:43:24+00:00",
      "cve": "CVE-2026-72375",
      "id": "CVE-2026-72375",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: afs: Fix reinitialisation of the inode, in particular -\u003elock_work",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72375.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T16:27:38Z",
      "cve": "CVE-2026-72375",
      "id": "CVE-2026-72375",
      "initial_release_date": "2026-09-03T00:07:26Z",
      "product_status:known_not_affected": "362",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72375",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72375.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

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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.
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  • 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.


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