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CVE-2026-31532

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: can: raw: fix ro->uniq use-after-free in raw_rcv() raw_release() unregisters raw CAN receive filters via can_rx_unregister(), b…

Published Apr 23, 2026CWE-416EPSS 0.18%

Overview

CVE-2026-31532 is a high-severity vulnerability. It was published on April 23, 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:

can: raw: fix ro->uniq use-after-free in raw_rcv()

raw_release() unregisters raw CAN receive filters via can_rx_unregister(),

but receiver deletion is deferred with call_rcu(). This leaves a window

where raw_rcv() may still be running in an RCU read-side critical section

after raw_release() frees ro->uniq, leading to a use-after-free of the

percpu uniq storage.

Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific

socket destructor. can_rx_unregister() takes an extra reference to the

socket and only drops it from the RCU callback, so freeing uniq from

sk_destruct ensures the percpu area is not released until the relevant

callbacks have drained.

[mkl: applied manually]

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/1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0Refgit.kernel.org/stable/c/1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3Refgit.kernel.org/stable/c/34c1741254ff972e8375faf176678a248826fe3aRefgit.kernel.org/stable/c/3f43f12fde34737fba091b7e3ab391e14ddbb0beRefgit.kernel.org/stable/c/572f0bf536ebc14f6e7da3d21a85cf076de8358eRefgit.kernel.org/stable/c/5e9cfffad898bbeaafd0ea608a6d267362f050fcRefgit.kernel.org/stable/c/64c8553decf5a5f2417bd54761ea0a832c56c4caRefgit.kernel.org/stable/c/7201a531b9a5ed892bfda5ded9194ef622de8ffaRefgit.kernel.org/stable/c/a535a9217ca3f2fccedaafb2fddb4c48f27d36dc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31532?

CVE-2026-31532 is a high-severity vulnerability. It was published on April 23, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-31532?

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-2026-31532?

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-2026-31532?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31532 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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