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CVE-2026-31516

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: xfrm: prevent policy_hthresh.work from racing with netns teardown A XFRM_MSG_NEWSPDINFO request can queue the per-net work item…

Published Apr 22, 2026CWE-362EPSS 0.14%

Overview

CVE-2026-31516 is a high-severity vulnerability. It was published on April 22, 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:

xfrm: prevent policy_hthresh.work from racing with netns teardown

A XFRM_MSG_NEWSPDINFO request can queue the per-net work item

policy_hthresh.work onto the system workqueue.

The queued callback, xfrm_hash_rebuild(), retrieves the enclosing

struct net via container_of(). If the net namespace is torn down

before that work runs, the associated struct net may already have

been freed, and xfrm_hash_rebuild() may then dereference stale memory.

xfrm_policy_fini() already flushes policy_hash_work during teardown,

but it does not synchronize policy_hthresh.work.

Synchronize policy_hthresh.work in xfrm_policy_fini() as well, so the

queued work cannot outlive the net namespace teardown and access a

freed struct net.

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/29fe3a61bcdce398ee3955101c39f89c01a8a77eRefgit.kernel.org/stable/c/4e2e77843fef473ef47e322d52436d8308582a96Refgit.kernel.org/stable/c/56ea2257b83ee29a543f158159e3d1abc1e3e4feRefgit.kernel.org/stable/c/8854e9367465d784046362698731c1111e3b39b8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31516?

CVE-2026-31516 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-31516?

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-2026-31516?

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-2026-31516?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31516 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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