CVE-2026-93097: Linux kernel · cxl/mbox: Break poison list loop on an empty payload
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
- 0.2% 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 17 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 in the Linux kernel to break the poison list loop on an empty payload, preventing the infinite loop condition. Users should apply the updated kernel versions containing this fix to remediate the issue.
Description
A vulnerability in the Linux kernel's cxl/mbox component causes an infinite loop when a device returns a zero count with the CXL_POISON_FLAG_MORE flag set, leading to a hang of the sysfs-triggered scan thread and blocking poison operations on the device. This occurs because the loop does not advance the record count, preventing the max_errors guard from triggering. The issue has been resolved by breaking the loop on an empty payload to prevent a malfunctioning or malicious device from causing a system hang.
References
- ubuntu.com/security/CVE-2026-93097 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93097 (opens in a new tab)
- git.kernel.org/linus/8b301c4afbce4bc3f94528441d8d5ce1366504ad (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-93097.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)