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CVE-2026-52916

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: batman-adv: frag: disallow unicast fragment in fragment batadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a B…

Published Jun 24, 2026EPSS 0.12%

Overview

CVE-2026-52916 is a medium-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

batman-adv: frag: disallow unicast fragment in fragment

batadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a

BATADV_UNICAST_FRAG packet is received. Once all fragments are collected

and the packet is reassembled, batadv_recv_frag_packet() calls

batadv_batman_skb_recv() again to process the defragmented payload.

A malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled

payload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting).

Each nesting level recurses through batadv_batman_skb_recv() without bound,

growing the kernel stack until it is exhausted.

Since refragmentation or fragments in fragments are not actually allowed,

discard all packets which are still BATADV_UNICAST_FRAG packets after the

defragmentation process.

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/0c208fa3859e3a33a1c38bebc41d021166e94ac8Refgit.kernel.org/stable/c/5418be6c2e117bf8a316582795a8e3ff90f45e5dRefgit.kernel.org/stable/c/5895ad21c7059a652da83fb817510f7a1e962abfRefgit.kernel.org/stable/c/7138c35c9ad39a2fca6264af6b87466471f04ffcRefgit.kernel.org/stable/c/aea54d0bbe156d5ab7d00d68f66149ff41f4612aRefgit.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3Refgit.kernel.org/stable/c/bc62216dc8e221e3781afa14430f45208bfa9af9Refgit.kernel.org/stable/c/bcda4814dc6524283c0b958882cb963d75fe411d

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52916?

CVE-2026-52916 is a medium-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-52916?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-52916?

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-2026-52916?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52916 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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