What is CVE-2026-63800?

CVE-2026-63800 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 5.10.9 onward and patched in 5.10.260, 5.15.211, 6.1.177 and others. CVE-2026-63800 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-63800?

CVE-2026-63800 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-63800?

Yes, CVE-2026-63800 has been patched. Fixed versions include 5.10.260, 5.15.211, 6.1.177 and others. If you are running Linux kernel 5.10.9 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-63800 actively exploited?

CVE-2026-63800 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-63800

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).

Package Linux Kernel

Published 2026-07-19

Last modified 2026-07-19

Patch available

Yes

Affected versions

Linux kernel versions 5.10.9, 5.4.91, 5.11 and later are affected. Fixed in 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3, 7.2-rc1 and their respective stable series.

Affected from

≥ 5.10.9 ≥ 5.4.91 ≥ 5.11

Fixed in

✓ 5.10.260 5.10.x ✓ 5.15.211 5.15.x ✓ 6.1.177 6.1.x ✓ 6.6.144 6.6.x ✓ 6.12.95 6.12.x ✓ 6.18.38 6.18.x ✓ 7.1.3 7.1.x ✓ 7.2-rc1

References

8 total

Showing 5 of 8 references View all on NVD

Frequently asked questions

What is CVE-2026-63800?

CVE-2026-63800 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10.9 onward and has been patched in 5.10.260, 5.15.211, 6.1.177 and others. CVE-2026-63800 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-63800?

Yes — CVE-2026-63800 has been patched. Fixed versions include 5.10.260, 5.15.211, 6.1.177 and others. If you are running Linux kernel 5.10.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-63800 actively exploited?

No — CVE-2026-63800 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.