What’s Vulnerable › Vulnerabilities

CVE-2026-68233: drm/vc4: Shut down BO cache timer before teardown

• Severity: unknown
• 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: 2026-08-10 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Shut down BO cache timer before teardown The BO cache timer callback schedules time_work, and time_work can rearm the timer through vc4_bo_cache_free_old(). vc4_bo_cache_destroy() deletes the timer and then cancels the work, which does not break that cycle: the work being cancelled can rearm the timer, and the timer then queues work again after teardown. Use timer_shutdown_sync() instead, so the timer cannot be rearmed and the cycle ends with cancel_work_sync().

Affected products

• Linux: 4.5 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6273dd3ffb54ec581855b82ae77331b66028249c
• https://git.kernel.org/stable/c/948cd4876dafbfab826384516df19fe813d9f1d1
• https://git.kernel.org/stable/c/a38f2724eb93a78ba250b01e0caf3468df4d3956
• https://git.kernel.org/stable/c/bac4c1a9af690b8635c6924872075c41d8763ed9
• https://git.kernel.org/stable/c/cf55c6f1b62a89bf365c48bf731ccf69340e3a16
• https://git.kernel.org/stable/c/e9264ee59bd94970b80b7548f693bccf0d4628da

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