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.

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EPSS — Exploit Prediction

0.0016

Probability of exploitation

0.06%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/0f3d9dd5e1fd52b39e25328307c6a694e994ffe3 https://git.kernel.org/stable/c/26d3339e465e54107bd85884341d1609c5300d6a https://git.kernel.org/stable/c/2c88b2d96e1d4d0c7c4589a4593d4cdee6d332d6 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

Frequently Asked Questions

What is CVE-2026-45838? +

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.

How do I check if I'm vulnerable to CVE-2026-45838? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.