CVE-2026-93818: Linux kernel · PCI: plda: Protect root bus removal with rescan lock
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 5% 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 has been implemented in the Linux kernel to hold the pci_rescan_remove_lock lock during root bus removal, preventing race conditions. Users should apply the updated kernel versions that include this fix. Since this is a kernel-level fix, upgrading to patched kernel versions is the recommended remediation.
Description
A vulnerability in the Linux kernel related to PCI root bus removal has been resolved. The issue involved a race condition due to lack of proper locking during root bus removal, which could lead to use-after-free errors or system crashes. This was fixed by holding the pci_rescan_remove_lock lock while stopping and removing a root bus to prevent concurrent rescan or hotplug operations from causing race conditions.
References
- ubuntu.com/security/CVE-2026-93818 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93818 (opens in a new tab)
- git.kernel.org/stable/c/105f212a21cc6bef6855841216dd476022626170 (opens in a new tab)
- git.kernel.org/stable/c/cb78a1d7a2787758a2d8e1182c346d4349f43260 (opens in a new tab)
- git.kernel.org/stable/c/4e4f9745f016c1631d00a4035b06f6e75d449e01 (opens in a new tab)