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

{
  "id": "dcd0383ab813cc4851fb75e880074b062d67e0a46c855bc046c57bf193e88ed7",
  "url": "https://osv.dev/vulnerability/CVE-2026-93219",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "clocksource/drivers/timer-sun4i: Advertise a real minimum delta",
    "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.",
    "evidence": "osv:CVE-2026-93219",
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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      "modified": "2026-10-28T02:30:26.453573929Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0cc4b14d7401d50e53a01f1554147ee075ee6943",
        "https://git.kernel.org/stable/c/151eb52f8712017c8f7b00bb2305e8916cb9e3dc",
        "https://git.kernel.org/stable/c/53a3bc024b8e5d284468cce84957cded5f859f98",
        "https://git.kernel.org/stable/c/753a220084dfc4d737f2ab9eaddc9a01a397edd7",
        "https://git.kernel.org/stable/c/bf38be01d43c4e4ca903aff7236d8486a950a252",
        "https://git.kernel.org/stable/c/d21808328225ab8cee46885bf9a0dffcefbe630e",
        "https://git.kernel.org/stable/c/ebba4d0aeba0e8eb3a9676380fc2652de8ab1c44",
        "https://git.kernel.org/stable/c/f0efafcdf6eec1f3361bfd8c811420198f55c8bb",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93219.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93219",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93219.json"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493076,
  "published_at": "2026-09-24T15:10:42.9+00:00"
}