CVE-2026-72120
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, the CAN BCM module lacks proper RCU list operations. bcm_rx_setup() and bcm_tx_setup() do not use list_add_rcu(), which can lead to improper initialization of the bcm_op structure during traversal by bcm_proc_show(). Also, bcm_release() removes operations without list_del_rcu(), potentially causing synchronization issues.
Risk Assessment
Missing RCU operations can lead to races and improper memory access, potentially causing system crashes or unpredictable behavior.
Recommendation
Apply the kernel patch that adds the missing list_add_rcu() and list_del_rcu() operations in the appropriate places.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: can: bcm: add missing rcu list annotations and operations sashiko-bot remarked the missing use of list_add_rcu() in bcm_[rx|tx]_setup() to have a proper initialized bcm_op structure when bcm_proc_show() traverses the bcm_op's under rcu_read_lock(). To cover all initial settings of the bcm_op's the list_add_rcu() calls are moved to the end of the setup code. While at it, also fix the mirroring removal side: bcm_release() called bcm_remove_op() - which frees the op via call_rcu() - on ops that were still linked in bo->tx_ops/bo->rx_ops, without list_del_rcu() first. Unlink each op with list_del_rcu() before handing it to bcm_remove_op(), matching the existing pattern in bcm_delete_tx_op()/bcm_delete_rx_op().