GHSA-7R67-4HF5-JFM4
Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-93219"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-24T16:17:17Z",
"severity": null
},
"details": "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.",
"id": "GHSA-7r67-4hf5-jfm4",
"modified": "2026-09-24T18:31:23Z",
"published": "2026-09-24T18:31:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93219"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0cc4b14d7401d50e53a01f1554147ee075ee6943"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/151eb52f8712017c8f7b00bb2305e8916cb9e3dc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/53a3bc024b8e5d284468cce84957cded5f859f98"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/753a220084dfc4d737f2ab9eaddc9a01a397edd7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bf38be01d43c4e4ca903aff7236d8486a950a252"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d21808328225ab8cee46885bf9a0dffcefbe630e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ebba4d0aeba0e8eb3a9676380fc2652de8ab1c44"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f0efafcdf6eec1f3361bfd8c811420198f55c8bb"
}
],
"schema_version": "1.4.0",
"severity": []
}
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