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CVE-2026-52971

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: ena: PHC: Fix potential use-after-free in get_timestamp Move the phc->active check and resp pointer assignment to after ac…

Published Jun 24, 2026CWE-416EPSS 0.13%

Overview

CVE-2026-52971 is a high-severity vulnerability. It was published on June 24, 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:

net: ena: PHC: Fix potential use-after-free in get_timestamp

Move the phc->active check and resp pointer assignment to after

acquiring the spinlock. Previously, phc->active was checked without

holding the lock, and resp was cached from ena_dev->phc.virt_addr

before the lock was acquired.

If ena_com_phc_destroy() runs between the lockless active check and

the lock acquisition, it sets active=false, releases the lock, frees

the DMA memory, and sets virt_addr=NULL. The get_timestamp path would

then read a NULL virt_addr and dereference it.

With both the active check and the pointer read under the lock,

destroy cannot free the memory while get_timestamp is using it.

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/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98Refgit.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97Refgit.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52971?

CVE-2026-52971 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-52971?

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-2026-52971?

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-2026-52971?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52971 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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