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).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.53%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.53% probability · 43th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563cccPatch
- https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2Patch
- https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dcPatch
- https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889Patch
- https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98Patch
- https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1Patch
- https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4Patch
- https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.