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CVE-2026-74661

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mac802154: fix netdev use-after-free in beacon worker mac802154_beacon_worker() reads local->beacon_req under RCU and derives t…

Published Aug 22, 2026EPSS 0.13%

Overview

CVE-2026-74661 is a high-severity vulnerability. It was published on August 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:

mac802154: fix netdev use-after-free in beacon worker

mac802154_beacon_worker() reads local->beacon_req under RCU and derives

the sub-interface from the request, but then drops the RCU read lock and

continues to use both sdata and the embedded wpan_dev.

mac802154_stop_beacons_locked() cancels only pending beacon work, clears

local->beacon_req and frees the request. A beacon worker that is already

running can therefore continue after interface teardown and dereference

the freed netdev private area.

The scan worker already pins the netdev before leaving RCU. Apply the

same lifetime rule to the beacon worker: take a netdev reference while

the request is still protected by RCU, and release it on all paths that

continue after the reference is acquired.

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/5f26a690e8efa54315e4922368daf54e0b8f5515Refgit.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1Refgit.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033Refgit.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31Refgit.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74661?

CVE-2026-74661 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-74661?

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-2026-74661?

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-2026-74661?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74661 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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