by Kastro CVE-2026-63800
Linux Linux — pNFS: Fix use-after-free in pnfs_update_layout()
Description · from the CVE record
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
ProductAffectedFixed inSource
Linux06f58dbc49a23c99e5c0f246879ed16667f7bf8f – < 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf984ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98CNA
Linux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 – < 1f24b8302c77dcaf79c64c073877a3b9f4dd25d21f24b8302c77dcaf79c64c073877a3b9f4dd25d2CNA
Linux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 – < 9c0fb5c09ae5bd68dc0038692af8127029cb03859c0fb5c09ae5bd68dc0038692af8127029cb0385CNA
Linux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 – < 7e37e9b3e82ade881e1798e2f4fcc54aff7793c17e37e9b3e82ade881e1798e2f4fcc54aff7793c1CNA
Linux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 – < 2883ddd7542b4437a2ab4908fe2773f690e208892883ddd7542b4437a2ab4908fe2773f690e20889CNA
Linux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 – < 200e7637f4d6a1342987045eea72641524f909dc200e7637f4d6a1342987045eea72641524f909dcCNA
Linux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 – < 9645aaf689aff57427ece3b9fa47d5b5399417f49645aaf689aff57427ece3b9fa47d5b5399417f4CNA
Linux2c8d5fc37fe2384a9bdb6965443ab9224d46f704 – < 13e198a90ca4050f4bee8a3f23680389a6563ccc13e198a90ca4050f4bee8a3f23680389a6563cccCNA
Linuxaa2399f55eff4ec78330bb6fe55f9df53e5cae0c–CNA
Linux5.10.9 – < 5.10.2605.10.260CNA
Linux5.4.91 – < 5.55.5CNA
Linux5.115.10.260CNA
Scores by source
Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total