CVE-2026-99227 Linux Kernel - Race Condition

Linux kernel io_uring contains a reference wrap vulnerability caused by improper handling of cancellation state in io_waitid, letting attackers cause double completion of requests, exploit requires repeated cancellation attempts.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Race Condition
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2 November 2026
Updated
3 November 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for io_uring cancellation reference wrap.

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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