CVE-2026-74305
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 versions
Linux kernel versions
5.15.192,
6.1.151,
6.6.105,
6.12.46,
6.16.1,
6.17
and later are affected. Fixed in
5.15.212,
6.1.178,
6.6.145,
6.12.97,
6.18.40,
7.1.5,
7.2-rc1
and their respective stable series.
References
7 totalFrequently asked questions
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What is CVE-2026-74305?
CVE-2026-74305 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.15.192 onward and has been patched in 5.15.212, 6.1.178, 6.6.145 and others. CVE-2026-74305 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-74305?
Yes. CVE-2026-74305 has been patched. Fixed versions include 5.15.212, 6.1.178, 6.6.145 and others. If you are running Linux kernel 5.15.192 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74305 actively exploited?
No. CVE-2026-74305 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.