CVE-2026-93219

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

clocksource/drivers/timer-sun4i: Advertise a real minimum delta

sun4i_clkevt_next_event() compensates for the timer stop/start

synchronization delay by programming evt - TIMER_SYNC_TICKS into the

hardware interval register. The clockevent device currently advertises

TIMER_SYNC_TICKS as min_delta_ticks, so the clockevents core is allowed

to call set_next_event() with evt == TIMER_SYNC_TICKS.

That programs a zero-tick interval. With oneshot/highres/nohz timer

operation this can leave the next event stuck, which was observed as a

boot hang on Allwinner D1 after the clockevents core started reusing

forced minimum-delta events.

Advertise one extra tick instead, so the smallest event accepted by the

core still programs at least one hardware tick after the synchronization

compensation.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References