CVE-2026-17523: can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet

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: 2026-07-27 · updated 2026-10-02

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.

Affected products

Linux kernel: from 2.6.29.1 before 4.19.226; from 4.20 before 5.4; 2.6.29, 2.6.29-rc2, 2.6.29-rc3, 2.6.29-rc4, 2.6.29-rc5, 2.6.29-rc6 (+2) — fixed in 4.19.226, 5.4

How to fix

Upgrade to a fixed version: Linux kernel 4.19.226, 5.4. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-17523 or the next vulnerability affects your stack