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).

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