CVE-2026-63800 Details
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).
A use-after-free vulnerability has been fixed in the Linux kernel's pNFS implementation. The issue arose in the 'pnfs_update_layout()' function when the 'NFS_LAYOUT_RETURN' branch was executed. The function first called 'pnfs_prepare_to_retry_layoutget(lo)', and if successful, it then called 'pnfs_put_layout_hdr(lo)' before triggering a tracepoint that still referenced 'lo'. This sequence created a use-after-free condition when the tracepoint accessed 'lo's fields. The vulnerability has been addressed by rearranging the order of operations, moving the tracepoint call before 'pnfs_put_layout_hdr(lo)'.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc | kernel.org | Patch |
| https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 | kernel.org | Patch |
| https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc | kernel.org | Patch |
| https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 | kernel.org | Patch |
| https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.4.91, < 5.5 >= 5.10.9, < 5.10.260 >= 5.11.1, < 5.15.211 >= 5.16, < 6.1.177 >= 6.2, < 6.6.144 >= 6.7, < 6.12.95 >= 6.13, < 6.18.38 >= 6.19, < 7.1.3 5.11 - 5.11 rc4 5.11 rc5 5.11 rc6 5.11 rc7 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 29, 2026 | Initial Analysis | [email protected] |
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |