CVE-2026-63800

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux06f58dbc49a23c99e5c0f246879ed16667f7bf8f < 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98affected
LinuxLinux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2affected
LinuxLinux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 9c0fb5c09ae5bd68dc0038692af8127029cb0385affected
LinuxLinux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1affected
LinuxLinux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 2883ddd7542b4437a2ab4908fe2773f690e20889affected
LinuxLinux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 200e7637f4d6a1342987045eea72641524f909dcaffected
LinuxLinux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 9645aaf689aff57427ece3b9fa47d5b5399417f4affected
LinuxLinux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 < 13e198a90ca4050f4bee8a3f23680389a6563cccaffected
LinuxLinuxaa2399f55eff4ec78330bb6fe55f9df53e5cae0caffected
LinuxLinux5.10.9 < 5.10.260affected
LinuxLinux5.4.91 < 5.5affected
LinuxLinux5.11affected
LinuxLinux0 < 5.11unaffected
LinuxLinux5.10.260 <= 5.10.*unaffected
LinuxLinux5.15.211 <= 5.15.*unaffected
LinuxLinux6.1.177 <= 6.1.*unaffected
LinuxLinux6.6.144 <= 6.6.*unaffected
LinuxLinux6.12.95 <= 6.12.*unaffected
LinuxLinux6.18.38 <= 6.18.*unaffected
LinuxLinux7.1.3 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References