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CVE-2026-93219

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 12e1480bcb4920c1b02b3793cb48756497919a60 · fixed in 0cc4b14d7401d50e53a01f1554147ee075ee6943; From 12e1480bcb4920c1b02b3793cb48756497919a60 · fixed in 53a3bc024b8e5d284468cce84957cded5f859f98; From 12e1480bcb4920c1b02b3793cb48756497919a60 · fixed in 753a220084dfc4d737f2ab9eaddc9a01a397edd7; From 12e1480bcb4920c1b02b3793cb48756497919a60 · fixed in ebba4d0aeba0e8eb3a9676380fc2652de8ab1c44; From 12e1480bcb4920c1b02b3793cb48756497919a60 · fixed in 151eb52f8712017c8f7b00bb2305e8916cb9e3dc; From 12e1480bcb4920c1b02b3793cb48756497919a60 · fixed in bf38be01d43c4e4ca903aff7236d8486a950a252; From 12e1480bcb4920c1b02b3793cb48756497919a60 · fixed in f0efafcdf6eec1f3361bfd8c811420198f55c8bb; From 12e1480bcb4920c1b02b3793cb48756497919a60 · fixed in d21808328225ab8cee46885bf9a0dffcefbe630e

  • Linux Linux

    3.13

  • KernelLinux

    From 3.13.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 8

git.kernel.org