CVE-2026-63800
Linux Kernel use-after-free
- Published19 Jul 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).
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
- https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc
- https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2
- https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc
- https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889
- https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98
- https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1
References
- https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc
- https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2
- https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc
- https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889
- https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98
- https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1
- https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4
- https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385
Related CVEs
Recent high-severity vulnerabilities sharing a weakness type.
Frequently asked
Is CVE-2026-63800 being actively exploited?
CVE-2026-63800 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.53%.
How severe is CVE-2026-63800?
CVE-2026-63800 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.53% probability of exploitation.
Which products are affected by CVE-2026-63800?
Affected products include Linux Kernel.
How do I fix CVE-2026-63800?
Upgrade affected software to a fixed version, for example Linux Kernel 5.10.260 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2026-63800 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.