CVE-2026-72120: can: bcm: add missing rcu list annotations and operations

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-15 · updated 2026-10-16

Description

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().

Affected products

Linux kernel: from 5.10.238 before 5.10.261; from 5.15.185 before 5.15.212; from 6.1.141 before 6.1.178; from 6.6.93 before 6.6.145; from 6.12.31 before 6.12.97; from 5.4.294 before 5.5 — fixed in 5.10.261, 5.15.212, 5.5, 6.1.178, 6.12.97, 6.15

How to fix

Upgrade to a fixed version: Linux kernel 5.10.261, 5.15.212, 5.5, 6.1.178. Check the vendor advisory for mitigations.

References

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