CVE-2026-31554

Summary

In the Linux kernel, the following vulnerability has been resolved:

futex: Require sys_futex_requeue() to have identical flags

Nicholas reported that his LLM found it was possible to create a UaF when sys_futex_requeue() is used with different flags. The initial motivation for allowing different flags was the variable sized futex, but since that hasn't been merged (yet), simply mandate the flags are identical, as is the case for the old style sys_futex() requeue operations.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0f4b5f972216782a4acb1ae00dcb55173847c2ff < 027145ace09fad4c7cbcd6c61fe9b429c63eb0e5affected
LinuxLinux0f4b5f972216782a4acb1ae00dcb55173847c2ff < 18b7d09c2b794c71d4252f3ea2cf84ad12b73d6aaffected
LinuxLinux0f4b5f972216782a4acb1ae00dcb55173847c2ff < e2f78c7ec1655fedd945366151ba54fcb9580508affected
LinuxLinux0f4b5f972216782a4acb1ae00dcb55173847c2ff < 19f94b39058681dec64a10ebeb6f23fe7fc3f77aaffected
LinuxLinux6.7affected
LinuxLinux0 < 6.7unaffected
LinuxLinux6.12.80 <= 6.12.*unaffected
LinuxLinux6.18.21 <= 6.18.*unaffected
LinuxLinux6.19.11 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References