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CVE-2026-64090: batman-adv: tt: avoid empty VLAN responses

• 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: 2026-07-19 · updated 2026-08-11

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: avoid empty VLAN responses The commit 16116dac2339 ("batman-adv: prevent TT request storms by not sending inconsistent TT TLVLs") added checks to the local (direct) TT response code. But the response can also be done indirectly by another node using the global TT state. To avoid such inconsistency states reported in the original fix, also avoid sending empty VLANs for replies from the global TT state.

Affected products

• Linux kernel: from 3.13 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.34 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.12.93, 6.18.34, 6.6.143

How to fix

Upgrade to a fixed version: Linux kernel 5.10.259, 5.15.210, 6.1.176, 6.12.93. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1f467d9a095211d3f77e8ff1bee90e73ffe01c64
• https://git.kernel.org/stable/c/99f17d1cdb371cbd037975239b321f346d38f6d2
• https://git.kernel.org/stable/c/9a02c8fc963ddeecb5d8788be0740c1869fc54b7
• https://git.kernel.org/stable/c/ab26e346322648f5c39de017d9723c9256284fce
• https://git.kernel.org/stable/c/b93ca6012712ecab2b551e120d7c95038d6a89e5
• https://git.kernel.org/stable/c/cfb30645280a2131e46cbd1b9a38cfd3ff893f12
• https://git.kernel.org/stable/c/ea4f757641430bcc8322772e161453c4db5ecb64
• https://git.kernel.org/stable/c/fa1bd704940b5bcbc32c0b28db9167405c8ee5e0

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