CVE-2026-63800

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

State: Published
Severity: 9.8 Critical
Published: Jul 19, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

Description

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).

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	06f58dbc49a23c99e5c0f246879ed16667f7bf8f to before 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98Affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2Affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 9c0fb5c09ae5bd68dc0038692af8127029cb0385Affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1Affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 2883ddd7542b4437a2ab4908fe2773f690e20889Affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 200e7637f4d6a1342987045eea72641524f909dcAffected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 9645aaf689aff57427ece3b9fa47d5b5399417f4Affected 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 13e198a90ca4050f4bee8a3f23680389a6563cccAffected aa2399f55eff4ec78330bb6fe55f9df53e5cae0cAffected 5.10.9 to before 5.10.260Affected 5.4.91 to before 5.5Affected
LinuxLinux	5.11Affected before 5.11Not affected 5.10.260 through 5.10.Not affected 5.15.211 through 5.15.Not affected 6.1.177 through 6.1.Not affected 6.6.144 through 6.6.Not affected 6.12.95 through 6.12.Not affected 6.18.38 through 6.18.Not affected 7.1.3 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

06f58dbc49a23c99e5c0f246879ed16667f7bf8f to before 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98Affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2Affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 9c0fb5c09ae5bd68dc0038692af8127029cb0385Affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1Affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 2883ddd7542b4437a2ab4908fe2773f690e20889Affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 200e7637f4d6a1342987045eea72641524f909dcAffected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 9645aaf689aff57427ece3b9fa47d5b5399417f4Affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to before 13e198a90ca4050f4bee8a3f23680389a6563cccAffected
aa2399f55eff4ec78330bb6fe55f9df53e5cae0cAffected
5.10.9 to before 5.10.260Affected
5.4.91 to before 5.5Affected

LinuxLinux

5.11Affected
before 5.11Not affected
5.10.260 through 5.10.*Not affected
5.15.211 through 5.15.*Not affected
6.1.177 through 6.1.*Not affected
6.6.144 through 6.6.*Not affected
6.12.95 through 6.12.*Not affected
6.18.38 through 6.18.*Not affected
7.1.3 through 7.1.*Not affected
7.2 and laterNot affected

References

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