CVE-2026-99231 Linux Kernel io_uring - Use After Free

Linux kernel io_uring contains a use-after-free vulnerability caused by improper ownership handling of requests before clearing ->head in io_waitid functions, letting attackers cause kernel memory corruption, exploit requires triggering specific io_uring operations.

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

Details

Type
Use After Free
Impact
Denial Of Service, Privilege Escalation
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 request ownership handling.

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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