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CVE-2026-45964

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path Commit 5940d1cf9f42 ("SUNRPC: Rebalance a kref in auth_gss.c") added…

Published May 27, 2026CWE-401EPSS 0.16%

Overview

CVE-2026-45964 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path

Commit 5940d1cf9f42 ("SUNRPC: Rebalance a kref in auth_gss.c") added

a kref_get(&gss_auth->kref) call to balance the gss_put_auth() done

in gss_release_msg(), but forgot to add a corresponding kref_put()

on the error path when kstrdup_const() fails.

If service_name is non-NULL and kstrdup_const() fails, the function

jumps to err_put_pipe_version which calls put_pipe_version() and

kfree(gss_msg), but never releases the gss_auth reference. This leads

to a kref leak where the gss_auth structure is never freed.

Add a forward declaration for gss_free_callback() and call kref_put()

in the err_put_pipe_version error path to properly release the

reference taken earlier.

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/3b2b6c42070ce4204936288253baf101e995c2d3Refgit.kernel.org/stable/c/655c9ba9915f05266998dbbf4b76b3c79b8a70aaRefgit.kernel.org/stable/c/a1bc9561b617ec7e2d09e6c134d1db8fcf9ca4a6Refgit.kernel.org/stable/c/a2d4e9a76de0b2178001214ba5de5bf94a7354aaRefgit.kernel.org/stable/c/b559be2ec6cdb2e9c2c36c23fbbd4690d8a5c3f7Refgit.kernel.org/stable/c/c20f925214249bb4fc04f7e197bea142a6438af6Refgit.kernel.org/stable/c/dd2fdc3504592d85e549c523b054898a036a6afeRefgit.kernel.org/stable/c/e464e26b2457005c87e158570498274b9f3b90c7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45964?

CVE-2026-45964 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-45964?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-45964?

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-2026-45964?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45964 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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