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CVE-2026-31657

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by reference batadv_bla_add_claim() can replace claim->backbone_gw and drop the old ga…

Published Apr 24, 2026CWE-476EPSS 0.40%

Overview

CVE-2026-31657 is a critical-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

batman-adv: hold claim backbone gateways by reference

batadv_bla_add_claim() can replace claim->backbone_gw and drop the old

gateway's last reference while readers still follow the pointer.

The netlink claim dump path dereferences claim->backbone_gw->orig and

takes claim->backbone_gw->crc_lock without pinning the underlying

backbone gateway. batadv_bla_check_claim() still has the same naked

pointer access pattern.

Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate

on a stable gateway reference until the read-side work is complete.

This keeps the dump and claim-check paths aligned with the lifetime

rules introduced for the other BLA claim readers.

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/1f2dc36c297d27733f1b380ea644cf15a361bd7bRefgit.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545fRefgit.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35Refgit.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52Refgit.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6Refgit.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbdRefgit.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2Refgit.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31657?

CVE-2026-31657 is a critical-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-31657?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31657?

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-2026-31657?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31657 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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