CVE-2026-63989

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the bridge netlink configuration path where the br setport() function is called while holding the bridge lock. Because br setport() can trigger dev set promiscuity(), which is a function capable of sleeping, this leads to a sleep in an atomic context. This occurs because the bridge lock is held across various attributes that do not require it, such as bridge flags, FDB port flushing, multicast attributes, group forward masks, and backup port/NHID settings. The problem is specifically triggered when certain bridge port flags change, potentially resulting in a system crash or kernel panic.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.