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CVE-2026-46231: batman-adv: bla: put backbone reference on failed claim hash insert

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-28 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: put backbone reference on failed claim hash insert When batadv_bla_add_claim() fails to insert a new claim into the hash, it leaked a reference to the backbone_gw for which the claim was intended. Call batadv_backbone_gw_put() on the error path to release the reference and avoid leaking the backbone_gw object.

Affected products

• Linux kernel: from 3.16.39 before 3.17; from 4.4.217 before 4.5; from 4.7.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140 — fixed in 3.17, 4.5, 5.10.258, 5.15.209, 6.1.175, 6.12.90

How to fix

Upgrade to a fixed version: Linux kernel 3.17, 4.5, 5.10.258, 5.15.209. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0baf4b659cdc7305cf685b5a5d60f9e3816ab5d0
• https://git.kernel.org/stable/c/2888c9a154123db0254ae4fb9bea570c7e1f2e06
• https://git.kernel.org/stable/c/65419eb4259a26a3cd3f56fa0e3b3c113bf8c256
• https://git.kernel.org/stable/c/6c8b68a7ed667a63aa603ba4d3a7088be143007e
• https://git.kernel.org/stable/c/769f413d374ff2b6ff6d8d8c37b4c1178e6cdf14
• https://git.kernel.org/stable/c/7cccf4eb4f96d3c3af91a00b7a9caa652439542e
• https://git.kernel.org/stable/c/ba9d20ee9076dac32c371116bacbe72480eb356c
• https://git.kernel.org/stable/c/fd0ca034c1e71ca7613cde9dd892836b2c2831bd

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