Critical severity · published Jul 19, 2026
CVE-2026-63800
pNFS: Fix use-after-free in pnfs_update_layout()
9.8
CVSS
0.6%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.4.91 before 5.5; 5.10.9 before 5.10.260; 5.11.1 before 5.15.211; 5.16 before 6.1.177; 6.2 before 6.6.144; 6.7 before 6.12.95; +7 more · source: NVD
LI
Linux · Linux
06f58dbc49a23c99e5c0f246879ed16667f7bf8f before 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98; 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 before 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2; 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 before 9c0fb5c09ae5bd68dc0038692af8127029cb0385; 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 before 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1; 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 before 2883ddd7542b4437a2ab4908fe2773f690e20889; 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 before 200e7637f4d6a1342987045eea72641524f909dc; +6 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63800
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63800
Patch
https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc
Patch
https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2
Patch
https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc
Patch
https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889
Patch
https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98
Patch
https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1
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