CVE-2026-45838

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: fix end-of-list detection in cgroup_storage_get_next_key() list_next_entry() never returns NULL -- when the current element is the last entry it wraps to the list head via container_of(). The subsequent NULL check is therefore dead code and get_next_key() never returns -ENOENT for the last element, instead reading storage->key from a bogus pointer that aliases internal map fields and copying the result to userspace. Replace it with list_entry_is_head() so the function correctly returns -ENOENT when there are no more entries.

References

• https://git.kernel.org/stable/c/32ce55d424395904986f5066f8755f6cb9993377
• https://git.kernel.org/stable/c/5828b9e5b272ecff7cf5d345128d3de7324117f7
• https://git.kernel.org/stable/c/85a2f30e40f7468db732f55659bc6318874f49af
• https://git.kernel.org/stable/c/b4b5a20bed82130da2f2818f04d52378952fbd0b
• https://git.kernel.org/stable/c/fc39753b7f92e09177777e9c648afe5aa3abb81f