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CVE-2026-63797

8.4 · HIGH

In the Linux kernel, the following vulnerability has been resolved: rpmsg: char: Fix use-after-free on probe error path rpmsg_chrdev_probe() stores the newly allocated eptdev in the default endpo…

Published Jul 19, 2026CWE-416EPSS 0.15%

Overview

CVE-2026-63797 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

rpmsg: char: Fix use-after-free on probe error path

rpmsg_chrdev_probe() stores the newly allocated eptdev in the default

endpoint's priv pointer before calling rpmsg_chrdev_eptdev_add(). If

rpmsg_chrdev_eptdev_add() then fails, its error path frees eptdev while

the default endpoint may still dispatch callbacks with the stale priv

pointer.

Avoid publishing eptdev through the default endpoint until

rpmsg_chrdev_eptdev_add() succeeds. Messages received before the priv

pointer is published should be ignored by rpmsg_ept_cb(). Flow-control

updates can hit rpmsg_ept_flow_cb() in the same window, so make both

callbacks return success when priv is NULL.

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/104d100212396801f1d9d388282f746e23e2bfd6Refgit.kernel.org/stable/c/1306fc4f76f765727a6d5aefbf08ef0c8f32996fRefgit.kernel.org/stable/c/1ff3f528e67d20e2b1483dcaba899dc7832b2e6bRefgit.kernel.org/stable/c/c5ebb06c7e24d531b68707168e04698859d642bcRefgit.kernel.org/stable/c/ddf13f91ca82c94ef7ad9c41a434a03313f8eb1bRefgit.kernel.org/stable/c/ff268cd9ccbce6472a0658791b417bf11c31ee39

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63797?

CVE-2026-63797 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-63797?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-63797?

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-2026-63797?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63797 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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