Race condition in Linux kernel - CVE-2026-93221
Published: September 25, 2026
Vulnerability identifier: #VU152175
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93221
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause memory corruption.
The vulnerability exists due to a race condition in nfsd4_end_grace() when grace completion is concurrently processed by the laundromat workqueue and RECLAIM_COMPLETE handling. A remote attacker can issue RECLAIM_COMPLETE requests during grace-period processing to cause memory corruption.
The race can cause concurrent reclaim-record walkers to corrupt reclaim_str_hashtbl and double-free nfs4_client_reclaim entries.
Affected software
Linux kernel
How to mitigate CVE-2026-93221
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3