CVE-2026-93219: Linux kernel · clocksource/drivers/timer-sun4i: Advertise a real minimum delta
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available that adjusts the minimum delta tick advertisement in the clocksource driver to prevent zero-tick intervals. Users should apply the official Linux kernel updates that include this fix. Since this is a kernel-level issue, updating to a patched kernel version is the recommended remediation.
Description
A vulnerability in the Linux kernel's clocksource driver for sun4i timers caused the clockevent device to advertise an incorrect minimum delta tick value. This allowed the timer to program a zero-tick interval, which could cause the next event to become stuck, leading to a boot hang on Allwinner D1 hardware. The issue was resolved by adjusting the advertised minimum delta to ensure at least one hardware tick is programmed after synchronization compensation.
References
- ubuntu.com/security/CVE-2026-93219 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93219 (opens in a new tab)
- git.kernel.org/stable/c/d21808328225ab8cee46885bf9a0dffcefbe630e (opens in a new tab)
- git.kernel.org/stable/c/ebba4d0aeba0e8eb3a9676380fc2652de8ab1c44 (opens in a new tab)
- git.kernel.org/stable/c/753a220084dfc4d737f2ab9eaddc9a01a397edd7 (opens in a new tab)
- git.kernel.org/stable/c/bf38be01d43c4e4ca903aff7236d8486a950a252 (opens in a new tab)
- git.kernel.org/stable/c/f0efafcdf6eec1f3361bfd8c811420198f55c8bb (opens in a new tab)
- git.kernel.org/stable/c/0cc4b14d7401d50e53a01f1554147ee075ee6943 (opens in a new tab)
- git.kernel.org/stable/c/53a3bc024b8e5d284468cce84957cded5f859f98 (opens in a new tab)
- git.kernel.org/stable/c/151eb52f8712017c8f7b00bb2305e8916cb9e3dc (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-93219.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)