FKIE_CVE-2026-63800

Vulnerability from fkie_nvd - Published: 2026-07-19 12:16 - Updated: 2026-07-20 15:16
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnfs_update_layout() When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields. Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/pnfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98",
              "status": "affected",
              "version": "06f58dbc49a23c99e5c0f246879ed16667f7bf8f",
              "versionType": "git"
            },
            {
              "lessThan": "1f24b8302c77dcaf79c64c073877a3b9f4dd25d2",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "9c0fb5c09ae5bd68dc0038692af8127029cb0385",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "7e37e9b3e82ade881e1798e2f4fcc54aff7793c1",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "2883ddd7542b4437a2ab4908fe2773f690e20889",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "200e7637f4d6a1342987045eea72641524f909dc",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "9645aaf689aff57427ece3b9fa47d5b5399417f4",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "13e198a90ca4050f4bee8a3f23680389a6563ccc",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aa2399f55eff4ec78330bb6fe55f9df53e5cae0c",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.260",
              "status": "affected",
              "version": "5.10.9",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.91",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/pnfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "lessThan": "5.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.260",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.211",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references \u0027lo\u0027. This results in a use-after-free when the\ntracepoint accesses lo\u0027s fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo)."
    }
  ],
  "id": "CVE-2026-63800",
  "lastModified": "2026-07-20T15:16:46.707",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-19T12:16:52.553",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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