CVE-2026-63800 PUBLISHED

pNFS: Fix use-after-free in pnfs_update_layout()

Assigner: Linux
Reserved: 19.07.2026 Published: 19.07.2026 Updated: 20.07.2026

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).

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 06f58dbc49a23c99e5c0f246879ed16667f7bf8f to 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 (excl.)
  • affected from 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 (excl.)
  • affected from 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to 9c0fb5c09ae5bd68dc0038692af8127029cb0385 (excl.)
  • affected from 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 (excl.)
  • affected from 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to 2883ddd7542b4437a2ab4908fe2773f690e20889 (excl.)
  • affected from 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to 200e7637f4d6a1342987045eea72641524f909dc (excl.)
  • affected from 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to 9645aaf689aff57427ece3b9fa47d5b5399417f4 (excl.)
  • affected from 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 to 13e198a90ca4050f4bee8a3f23680389a6563ccc (excl.)
  • Version aa2399f55eff4ec78330bb6fe55f9df53e5cae0c is affected
  • affected from 5.10.9 to 5.10.260 (excl.)
  • affected from 5.4.91 to 5.5 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 5.11 is affected
  • unaffected from 0 to 5.11 (excl.)
  • unaffected from 5.10.260 to 5.10.* (incl.)
  • unaffected from 5.15.211 to 5.15.* (incl.)
  • unaffected from 6.1.177 to 6.1.* (incl.)
  • unaffected from 6.6.144 to 6.6.* (incl.)
  • unaffected from 6.12.95 to 6.12.* (incl.)
  • unaffected from 6.18.38 to 6.18.* (incl.)
  • unaffected from 7.1.3 to 7.1.* (incl.)
  • unaffected from 7.2-rc1 to * (incl.)

References