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CVE-2026-63948

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn __set_chan_timer() takes a l2cap_chan reference via l2cap_…

Published Jul 19, 2026EPSS 0.21%

Overview

CVE-2026-63948 is a known-severity vulnerability. It was published on July 19, 2026.

Technical description

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

Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn

__set_chan_timer() takes a l2cap_chan reference via l2cap_chan_hold()

before scheduling the delayed work. The normal path in

l2cap_chan_timeout() drops this reference with l2cap_chan_put() at the

end, but the early return when chan->conn is NULL skips the put,

leaking the reference.

Add the missing l2cap_chan_put() before the early return.

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/08d81fe96f80a8e20c7acb573b6a45d901fcf2cdRefgit.kernel.org/stable/c/107c826e4ef9ec5ad8f60e6fe64d8d5325ba508fRefgit.kernel.org/stable/c/50f1bcaaaa3a80bb1c3472044bc146e8d49d51eeRefgit.kernel.org/stable/c/63cd225cc13d782a85e2a73c04d0d350153eada1Refgit.kernel.org/stable/c/8894c2010435a56ce7c6c2a8785860c13554df2fRefgit.kernel.org/stable/c/9dbd84990394c51f5cee1e8871bb5ff8af5ed939Refgit.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060Refgit.kernel.org/stable/c/e8a5baff5be273ca07771fd2b9bb1f2a4152917b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63948?

CVE-2026-63948 is a known-severity vulnerability. It was published on July 19, 2026.

How severe is CVE-2026-63948?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-63948?

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-2026-63948?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63948 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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