Medium [CVE-2026-64090] avoid empty VLAN responses
This medium-severity Red Hat Linux advisory covers CVE-2026-64090.
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Summary
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. A flaw was found in the Linux kernel's batman-adv (Better Approach To Mobile Ad-hoc Networking - Advanced) translation table module.
This vulnerability could allow an attacker to cause network instability or a denial of service (DoS). The issue arises from the system sending inconsistent translation table type-length-value (TLVs) and empty VLAN responses, which can lead to 'TT request storms' within the network.
The resolution prevents the sending of empty VLANs for replies, mitigating the risk of these inconsistencies. Red Hat severity: Moderate.
Weakness: CWE-770. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
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