CVE-2026-97436

/// Technical description

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

dpaa2-switch: rework FDB management on the bridge leave path

On bridge leave, the dpaa2_switch_port_set_fdb() function always

allocates a new FDB for the port which is becoming standalone. In case

no FDB is found, then the port leaving a bridge will continue to use the

current one.

The above logic does not cover the case in which there are multiple

bridges which have ports from the same DPSW instance. In this case, when

the last port leaves bridge #1, it finds an unused FDB to switch to, but

the old FDB is not marked as unused. Since the number of FDBs is equal

to the number of DPSW interfaces, this will eventually lead to multiple

ports sharing the same FDB.

Fix this by changing how we are managing the FDBs on the leave path.

Instead of directly allocating a new FDB, first verify if the current

port is the last one to leave a bridge. If this is the case, then

continue to use the current FDB and only allocate anoth

/// 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