CVE-2026-93221 Linux Kernel - Race Condition

Linux kernel contains a race condition in nfsd_net boolean flags accessed concurrently without serialization, causing double-free and memory corruption, letting attackers cause denial of service, exploit requires concurrent access to nfsd_net flags.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.33% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Race Condition
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
24 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for nfsd_net flag race condition.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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