CVE-2026-23362 can: bcm: fix locking for bcm_op runtime updates
A missing lock initialization in the Linux kernel CAN BCM module can lead to a race condition and potential denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23362?
CVE-2026-23362 is a medium-severity vulnerability in Linux kernel, published on 25 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
can: bcm: fix locking for bcm_op runtime updates
Commit c2aba69d0c36 ("can: bcm: add locking for bcm_op runtime updates") added a locking for some variables that can be modified at runtime when updating the sending bcm_op with a new TX_SETUP command in bcm_tx_setup().
Usually the RX_SETUP only handles and filters incoming traffic with one exception: When the RX_RTR_FRAME flag is set a predefined CAN frame is sent when a specific RTR frame is received. Therefore the rx bcm_op uses bcm_can_tx() which uses the bcm_tx_lock that was only initialized in bcm_tx_setup(). Add the missing spin_lock_init() when allocating the bcm_op in bcm_rx_setup() to handle the RTR case properly.
Weakness: CWE-667
Which versions are affected by CVE-2026-23362?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23362?
Apply the vendor's patch.
Is CVE-2026-23362 being exploited?
There is no known exploitation of CVE-2026-23362 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23362, DEBIAN-CVE-2026-23362, GHSA-57pc-f5j8-25x4, ROOT-OS-DEBIAN-11-CVE-2026-23362, ROOT-OS-DEBIAN-12-CVE-2026-23362, ROOT-OS-DEBIAN-13-CVE-2026-23362 and 3 more.