CVE-2026-89589: Linux kernel · acpi/apei/ghes: Use raw_spinlock_t for CXL CPER work locks
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% 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 has been implemented that converts the affected locks from spinlock_t to raw_spinlock_t and restructures the registration and unregistration functions to prevent deadlocks and race conditions. Users should update to the fixed kernel versions listed or later. Since this is a kernel-level concurrency fix, applying the official kernel updates is the recommended remediation. No additional mitigations are indicated.
Description
A vulnerability in the Linux kernel's ACPI APEI GHES component involving improper use of spinlock types for CXL CPER work locks has been resolved. The issue caused a potential deadlock when interrupts occurred on the same CPU holding a spinlock with local interrupts enabled. The fix involves converting spinlock_t to raw_spinlock_t and restructuring work registration and unregistration to prevent race conditions and stale work execution.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89589 (opens in a new tab)
- git.kernel.org/stable/c/0e25382b05de48d09b243d3d447d236a6d735bc2 (opens in a new tab)
- git.kernel.org/stable/c/6625ca499c3131ef63be3215f8f942d7a097ea3a (opens in a new tab)
- git.kernel.org/stable/c/c735dbce7ad03df708bf22ec964f67e43cbc823a (opens in a new tab)
- ubuntu.com/security/CVE-2026-89589 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89589 (opens in a new tab)
- git.kernel.org/linus/6625ca499c3131ef63be3215f8f942d7a097ea3a (opens in a new tab)