CVE-2026-93203

/// Technical description

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

batman-adv: bla: avoid CRC corruption due to parallel claim add

batadv_bla_add_claim() is used to add claims and modify the backbone of

claims for CLAIM frames from remote backbones and local packets. When it

handles a claim, it needs to either

* add the new claim's CRC to the backbone CRC

* remove the already existing claim's CRC from the old backbone and add it

to the new backbone

But when the "new" claim code was running in parallel to the "change

backbone" code, it can happen that the CRC was invalid because the

backbone_gw of the claim was changed twice in the "new" claim code path:

* CPU0 creates the claim for gateway A and publishes it in the claim

hash. The crc16 of the address has not yet been added to A's crc at

this point.

* CPU1 processes a claim frame of gateway B for the same client, finds

the just published claim, and performs the ownership change: it

switches the pointer to B, removes th

/// 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