CVE-2026-74305: Linux

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: bpf: Tighten cgroup storage cookie checks for prog arrays The fix in commit abad3d0bad72 ("bpf: Fix oob access in cgroup local storage") is still incomplete. The prog-array compatibility check treats a program with no cgroup storage as compatible with any stored storage cookie. This allows a storage-less program to bridge a tail call chain between an entry program and a storage-using callee even though cgroup local storage at runtime still follows the caller's context, that is, A -> B(no storage) -> C(storage) path. Requiring exact cookie equality would break the legitimate case of a storage-less leaf program being tail called from a storage-using one. Instead, only accept a zero storage cookie if the program cannot perform tail calls itself. This keeps A -> B(no storage) working while rejecting the A -> B(no storage) -> C(storage) bridge.

Affected products

• Linux Linux: from 5.15.192, before 5.15.212 (fixed in 5.15.212); from 6.1.151, before 6.1.178 (fixed in 6.1.178); from 6.6.105, before 6.6.145 (fixed in 6.6.145); from 6.12.46, before 6.12.97 (fixed in 6.12.97); from 6.16.1, before 6.17 (fixed in 6.17); from 6.17, before 6.18.40 (fixed in 6.18.40); …

Published 2026-08-15. Last modified 2026-08-17.