Critical severity9.8NVD Advisory· Published Jul 19, 2026· Updated Aug 17, 2026
CVE-2026-63800
CVE-2026-63800
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).
Affected products
9cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 6 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=5.4.91,<5.5
- cpe:2.3:o:linux:linux_kernel:5.11:-:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:*
- (no CPE)
- osv-coords2 versions
< 5.10.260+ 1 more
- (no CPE)range: < 5.10.260
- (no CPE)range: < 7.1.4-1.1
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563cccnvdPatch
- git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2nvdPatch
- git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dcnvdPatch
- git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889nvdPatch
- git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98nvdPatch
- git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1nvdPatch
- git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4nvdPatch
- git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385nvdPatch
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