pNFS: Fix use-after-free in pnfs_update_layout()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63800
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 12:16:52 UTC
Updated2026-07-20 15:16:46 UTC
DescriptionIn 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).

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001770000 probability, percentile 0.074750000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 06f58dbc49a23c99e5c0f246879ed16667f7bf8f 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 git Not specified
CNA Linux Linux affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 git Not specified
CNA Linux Linux affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 9c0fb5c09ae5bd68dc0038692af8127029cb0385 git Not specified
CNA Linux Linux affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 git Not specified
CNA Linux Linux affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 2883ddd7542b4437a2ab4908fe2773f690e20889 git Not specified
CNA Linux Linux affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 200e7637f4d6a1342987045eea72641524f909dc git Not specified
CNA Linux Linux affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 9645aaf689aff57427ece3b9fa47d5b5399417f4 git Not specified
CNA Linux Linux affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 13e198a90ca4050f4bee8a3f23680389a6563ccc git Not specified
CNA Linux Linux affected aa2399f55eff4ec78330bb6fe55f9df53e5cae0c git Not specified
CNA Linux Linux affected 5.10.9 5.10.260 semver Not specified
CNA Linux Linux affected 5.4.91 5.5 semver Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 5.10.260 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.211 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.3 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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