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Vulnerability record · CVE-2026-63800 · published 19 July 2026

CVE-2026-63800: Linux kernel use after free vulnerability

Linux · Linux Kernel

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).

9.8 CVSS 3.1 Critical EPSS 0.53% · top 57.6% CWE-416 · Use after free
9.8CVSS 3.1 base score
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Aug 2026Last modified by NVD

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).

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc Patch
https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 Patch
https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc Patch
https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889 Patch
https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 Patch
https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 Patch
https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4 Patch
https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-63800), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.