CVE-2026-93219 (GCVE-0-2026-93219)
Vulnerability from cvelistv5
Published
2026-09-24 15:10
Modified
2026-10-19 09:07
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 12e1480bcb4920c1b02b3793cb48756497919a60
Version: 12e1480bcb4920c1b02b3793cb48756497919a60
Version: 12e1480bcb4920c1b02b3793cb48756497919a60
Version: 12e1480bcb4920c1b02b3793cb48756497919a60
Version: 12e1480bcb4920c1b02b3793cb48756497919a60
Version: 12e1480bcb4920c1b02b3793cb48756497919a60
Version: 12e1480bcb4920c1b02b3793cb48756497919a60
Version: 12e1480bcb4920c1b02b3793cb48756497919a60
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{
  "containers": {
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          "programFiles": [
            "drivers/clocksource/timer-sun4i.c"
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      "cpeApplicability": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclocksource/drivers/timer-sun4i: Advertise a real minimum delta\n\nsun4i_clkevt_next_event() compensates for the timer stop/start\nsynchronization delay by programming evt - TIMER_SYNC_TICKS into the\nhardware interval register. The clockevent device currently advertises\nTIMER_SYNC_TICKS as min_delta_ticks, so the clockevents core is allowed\nto call set_next_event() with evt == TIMER_SYNC_TICKS.\n\nThat programs a zero-tick interval. With oneshot/highres/nohz timer\noperation this can leave the next event stuck, which was observed as a\nboot hang on Allwinner D1 after the clockevents core started reusing\nforced minimum-delta events.\n\nAdvertise one extra tick instead, so the smallest event accepted by the\ncore still programs at least one hardware tick after the synchronization\ncompensation."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:07:31.003Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0cc4b14d7401d50e53a01f1554147ee075ee6943"
        },
        {
          "url": "https://git.kernel.org/stable/c/53a3bc024b8e5d284468cce84957cded5f859f98"
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        {
          "url": "https://git.kernel.org/stable/c/753a220084dfc4d737f2ab9eaddc9a01a397edd7"
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        {
          "url": "https://git.kernel.org/stable/c/ebba4d0aeba0e8eb3a9676380fc2652de8ab1c44"
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          "url": "https://git.kernel.org/stable/c/151eb52f8712017c8f7b00bb2305e8916cb9e3dc"
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          "url": "https://git.kernel.org/stable/c/bf38be01d43c4e4ca903aff7236d8486a950a252"
        },
        {
          "url": "https://git.kernel.org/stable/c/f0efafcdf6eec1f3361bfd8c811420198f55c8bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/d21808328225ab8cee46885bf9a0dffcefbe630e"
        }
      ],
      "title": "clocksource/drivers/timer-sun4i: Advertise a real minimum delta",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93219",
    "datePublished": "2026-09-24T15:10:42.900Z",
    "dateReserved": "2026-09-17T16:02:15.094Z",
    "dateUpdated": "2026-10-19T09:07:31.003Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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