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CVE-2026-80928

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: smack: fix cred UAF in smack_file_send_sigiotask() When inspecting the credentials of another task, objective credentials (->re…

Published Sep 11, 2026EPSS 0.13%

Overview

CVE-2026-80928 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:

smack: fix cred UAF in smack_file_send_sigiotask()

When inspecting the credentials of another task, objective credentials

(->real_cred, accessed with __task_cred()) must always be used.

Accessing ->cred on a non-current task is forbidden unless that task is

being created or destroyed; a task is allowed to change its own ->cred

pointer with no synchronization, and changing ->cred should only affect the

current syscall.

smack_file_send_sigiotask() was accessing both sets of credentials: First

tsk->cred, then __task_cred(tsk).

Fix it, always access the objective credentials here.

I have tested that this bug can lead to a KASAN-reported UAF of struct cred

in smack_file_send_sigiotask(), and that this fix prevents the race.

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/7c7fe043f3099d0d35002b248967f75e55345b93Refgit.kernel.org/stable/c/a512366d84e134a9eefc2cc40eeb6e80e2ec162cRefgit.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92beRefgit.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870Refgit.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62Refgit.kernel.org/stable/c/f9c7b1f2b9d8f4176d2632743f51400855978aceRefgit.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80928?

CVE-2026-80928 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-2026-80928?

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-2026-80928?

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-2026-80928?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80928 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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