CVE-2026-68233
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().
CSIRTS triage
- What
- VC4 GPU BO cache timer not properly shut down before device teardown causes use-after-free or crash.
- Who is affected
- Systems running affected Linux kernel versions on Broadcom VC4 GPU hardware.
- Urgency
- Medium severity with CVSS 4.7; timer reference during teardown can cause system instability.
- Action
- Apply Linux kernel patch ensuring BO cache timer is shut down before VC4 device teardown.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Advisory coverage (2)
- mediumCVE-2026-68233: drm/vc4: Shut down BO cache timer before teardownmsrc · 2026-08-11
- unknownCVE-2026-68233: In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Shut down BO cach…nvd · 2026-08-10
External references
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