CVE-2026-97588: Linux kernel · s390/crypto: Map EBUSY to EIO when key conversion fails repeatedly
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 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 25 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 translate persistent -EBUSY errors to -EIO after retry exhaustion, ensuring proper error propagation and callback invocation. Users should apply the updated kernel versions containing this fix.
Description
A vulnerability in the Linux kernel's s390 crypto subsystem causes indefinite blocking when hardware persistently returns the -EBUSY error after retry exhaustion. The crypto API treats -EBUSY as a queueing status and swallows it, preventing the completion callback from firing. This issue has been resolved by mapping persistent -EBUSY errors to -EIO to ensure proper error propagation and callback invocation.
References
- ubuntu.com/security/CVE-2026-97588 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-97588 (opens in a new tab)
- git.kernel.org/stable/c/7a08507ea5b4d06ad8d269287913573f34467565 (opens in a new tab)
- git.kernel.org/stable/c/e267bd142664a181474112392aeaa8b3d4b12f2e (opens in a new tab)
- git.kernel.org/stable/c/f6b263679aa72ad2e534bf93db55f2589549a40e (opens in a new tab)