CVE-2026-63800 (GCVE-0-2026-63800)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
VLAI
Title
pNFS: Fix use-after-free in pnfs_update_layout()
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).
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 06f58dbc49a23c99e5c0f246879ed16667f7bf8f , < 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 9c0fb5c09ae5bd68dc0038692af8127029cb0385 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 2883ddd7542b4437a2ab4908fe2773f690e20889 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 200e7637f4d6a1342987045eea72641524f909dc (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 9645aaf689aff57427ece3b9fa47d5b5399417f4 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 13e198a90ca4050f4bee8a3f23680389a6563ccc (git)
Affected: aa2399f55eff4ec78330bb6fe55f9df53e5cae0c (git)
Affected: 5.10.9 , < 5.10.260 (semver)
Affected: 5.4.91 , < 5.5 (semver)
Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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          "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)."
        }
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            "version": "3.1"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc"
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    "dateReserved": "2026-07-19T07:54:57.013Z",
    "dateUpdated": "2026-07-20T13:40:10.522Z",
    "state": "PUBLISHED"
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This results in a use-after-free when the\\ntracepoint accesses lo\u0027s fields.\\n\\nFix this by moving the tracepoint call before 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-20T17:10:15+00:00",
      "cve": "CVE-2026-63800",
      "id": "CVE-2026-63800",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "29",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: pNFS: Fix use-after-free in pnfs_update_layout()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63800.json",
      "version": "3"
    }
  }
}



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