Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.4.91, < 5.5 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563cccPatch
- https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2Patch
- https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dcPatch
- https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889Patch
- https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98Patch
- https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1Patch
- https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4Patch
- https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385Patch
FAQ
What is CVE-2026-63800?
CVE-2026-63800 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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...
How severe is CVE-2026-63800?
CVE-2026-63800 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-63800?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.