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CVE-2026-80955

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: dm-pcache: fix use-after-free and invalid seg operations in kset_replay() In kset_replay, when key->seg_gen is stale (key->seg_…

Published Sep 11, 2026EPSS 0.17%

Overview

CVE-2026-80955 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

dm-pcache: fix use-after-free and invalid seg operations in kset_replay()

In kset_replay, when key->seg_gen is stale (key->seg_gen <

key->cache_pos.cache_seg->gen), cache_key_put(key) is called but then

key->cache_pos.cache_seg is accessed as the argument to cache_seg_get().

This is a use-after-free on the freed key memory. Although mempool

recycled memory is not immediately reclaimed or overwritten in practice,

this is still a potential UAF bug.

Additionally, for expired invalid keys, setting the cache->seg_map bit

and calling cache_seg_get() is unreasonable since the corresponding

segment data is no longer valid.

Fix both issues by moving cache_seg_get() and __set_bit() after the

gen check, so they only execute for valid keys, and using continue to

skip invalid keys.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1894fc7a3bab90143dcd26ef8ee27040ef4a7501Refgit.kernel.org/stable/c/c2e894eac398b258f12fdec73ed6ba081047f7b3Refgit.kernel.org/stable/c/f39a3e9cc5946473e16d6f5071b2ee0216c56d06

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80955?

CVE-2026-80955 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-80955?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-80955?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-80955?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80955 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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