CVE-2026-17523 can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet
A race condition in the Linux kernel CAN BCM module could lead to a denial of service, requiring a kernel patch to switch timer execution context.
- 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-2026-17523?
CVE-2026-17523 is a high-severity vulnerability in Linux kernel, published on 27 Jul 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: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet
This patch switches the timer to HRTIMER_MODE_SOFT, which executed the timer callback in softirq context and removes the hrtimer_tasklet.
Which versions are affected by CVE-2026-17523?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-17523?
Apply the vendor's patch.
Is CVE-2026-17523 being exploited?
There is no known exploitation of CVE-2026-17523 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-17523, GHSA-pvqq-pw2j-4v86, UBUNTU-CVE-2026-17523.