CVE-2026-89727: Linux kernel · KVM: arm64: GICv2: Don't WARN on out-of-range GICV_DIR INTID
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 11 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 removes the warning and ignores failed lookups of out-of-range INTIDs, preventing host panics. Users should update to a patched Linux kernel version that includes this fix. Since this is a kernel-level issue, applying the official kernel updates from the vendor or distribution is the recommended remediation.
Description
A vulnerability in the Linux kernel's KVM implementation for arm64 with GICv2 has been resolved. The issue involved the kernel warning (WARN_ON_ONCE) and potentially panicking hosts when a guest wrote an out-of-range interrupt ID (INTID) to the GICV_DIR register. This occurred because the kernel treated a failed lookup of such INTIDs as a condition that "can't happen," but guests could trigger it at will. The fix drops the warning and ignores failed lookups to prevent host panics.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89727 (opens in a new tab)
- git.kernel.org/stable/c/78b95c571d021391153a5ac7981e9e4d5cc856a3 (opens in a new tab)
- git.kernel.org/stable/c/c6d9c8ac6521d3049ec90ac58bebd23ed03ac496 (opens in a new tab)
- ubuntu.com/security/CVE-2026-89727 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89727 (opens in a new tab)
- git.kernel.org/linus/c6d9c8ac6521d3049ec90ac58bebd23ed03ac496 (opens in a new tab)