CVE-2026-31453 (GCVE-0-2026-31453)
Vulnerability from cvelistv5
Published
2026-04-22 13:53
Modified
2026-08-05 12:22
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: xfs: avoid dereferencing log items after push callbacks After xfsaild_push_item() calls iop_push(), the log item may have been freed if the AIL lock was dropped during the push. Background inode reclaim or the dquot shrinker can free the log item while the AIL lock is not held, and the tracepoints in the switch statement dereference the log item after iop_push() returns. Fix this by capturing the log item type, flags, and LSN before calling xfsaild_push_item(), and introducing a new xfs_ail_push_class trace event class that takes these pre-captured values and the ailp pointer instead of the log item pointer.
References
Impacted products
Vendor Product Version
Linux Linux Version: 90c60e16401248a4900f3f9387f563d0178dcf34
Version: 90c60e16401248a4900f3f9387f563d0178dcf34
Version: 90c60e16401248a4900f3f9387f563d0178dcf34
Version: 90c60e16401248a4900f3f9387f563d0178dcf34
Version: 90c60e16401248a4900f3f9387f563d0178dcf34
Version: 90c60e16401248a4900f3f9387f563d0178dcf34
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{
  "containers": {
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          "programFiles": [
            "fs/xfs/xfs_trace.h",
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
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                  "versionStartIncluding": "5.9",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: avoid dereferencing log items after push callbacks\n\nAfter xfsaild_push_item() calls iop_push(), the log item may have been\nfreed if the AIL lock was dropped during the push. Background inode\nreclaim or the dquot shrinker can free the log item while the AIL lock\nis not held, and the tracepoints in the switch statement dereference\nthe log item after iop_push() returns.\n\nFix this by capturing the log item type, flags, and LSN before calling\nxfsaild_push_item(), and introducing a new xfs_ail_push_class trace\nevent class that takes these pre-captured values and the ailp pointer\ninstead of the log item pointer."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable XFS AIL push path is reached through local filesystem activity on a mounted XFS filesystem, via syscalls such as ioctl/setattr, create/unlink, writes, and reclaim-triggering workload. It is not reachable directly over a network, adjacent, or physical interface.\nAC:L - A local attacker can generate dirty/reclaimable inode or dquot log items and induce reclaim or pressure while xfsaild pushes the AIL. The race is between attacker-influenced filesystem workload and kernel background paths, so under the higher-severity rule this is low complexity.\nPR:L - An unprivileged local user with ordinary access to files on an existing XFS mount can feed the AIL with log items and trigger reclaim behavior. Mounting XFS itself needs elevated privileges, but exploiting an already-mounted writable XFS filesystem does not require init-namespace root.\nUI:N - No victim interaction is required once the attacker has local access to the XFS filesystem. The vulnerable xfsaild work runs asynchronously in the kernel.\nS:U - The vulnerability affects the kernel and filesystem state within the same local security authority. It does not cross a virtualization, IOMMU, or separate security-scope boundary.\nC:H - This is a kernel use-after-free of XFS log-item memory after push callbacks can free the object. Under the required scoring guidance, use-after-free conditions are treated as high confidentiality impact because reclaimed object contents can enable kernel memory disclosure.\nI:H - The freed log-item memory can be reclaimed and attacker-influenced before kernel dereference, giving a plausible path to stronger heap exploitation primitives. Under the required scoring guidance, kernel use-after-free conditions are scored as high integrity impact.\nA:H - The bug is a KASAN-confirmed slab use-after-free in xfsaild and can crash or panic the kernel. Kernel crashes are high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:22:42.104Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c8a2ab339b88d10fc34a3318c92f07d8a467019d"
        },
        {
          "url": "https://git.kernel.org/stable/c/7121b22b0bac89394cc4c6a54b5aebc15347bdf5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4d603e8e58a3bf35480135ccca2b4f7238abda5"
        },
        {
          "url": "https://git.kernel.org/stable/c/95fb5d643cc70959baa54cd17f52f80ffc3295e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/451c6329d9afa45862c36fe6677eb7750db60617"
        },
        {
          "url": "https://git.kernel.org/stable/c/79ef34ec0554ec04bdbafafbc9836423734e1bd6"
        }
      ],
      "title": "xfs: avoid dereferencing log items after push callbacks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31453",
    "datePublished": "2026-04-22T13:53:47.577Z",
    "dateReserved": "2026-03-09T15:48:24.091Z",
    "dateUpdated": "2026-08-05T12:22:42.104Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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