CVE-2026-93781: Linux kernel · scsi: core: Do not block on tag allocation in scsi_eh_lock_door()
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 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 modifies the request allocation in scsi_eh_lock_door() to avoid blocking on tag allocation. Users should apply the official Linux kernel updates that include this fix to resolve the deadlock issue. No additional mitigation is required once the patch is applied.
Description
A deadlock vulnerability in the Linux kernel SCSI subsystem was resolved by changing request allocation behavior in the error handler. The issue occurs when scsi_eh_lock_door() blocks waiting for a tag held by requeued commands during error recovery, causing a circular dependency and guaranteed deadlock on devices with a single driver tag. The fix prevents blocking by making request allocation fail immediately if no tag is available, allowing error recovery to complete and queues to restart normally.
References
- ubuntu.com/security/CVE-2026-93781 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93781 (opens in a new tab)
- git.kernel.org/stable/c/dc9e1b6b9080dd6374cc9a38e4b53abca63c3b1b (opens in a new tab)
- git.kernel.org/stable/c/732cb6bb37fd26863d5786522fb1997e7f5865b4 (opens in a new tab)
- git.kernel.org/stable/c/261c80a6b23e34ba98bcf3f75317e35ecf0a08f0 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-93781 (opens in a new tab)
- git.kernel.org/stable/c/3bc7af4cefac1c583f0607f6183a67012436aad9 (opens in a new tab)
- git.kernel.org/stable/c/6b450c277c106c4e31411067f025d1aaa27c2a02 (opens in a new tab)