CVE-2026-97590: Linux kernel · s390/crypto: Fix missing scrub of temp buffers with PAES algorithm
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 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 explicitly scrub temporary buffers used in the PAES algorithm. Users should update to a patched kernel version that includes these changes to prevent potential data exposure.
Description
A vulnerability in the Linux kernel's s390 crypto implementation was fixed to address missing scrubbing of temporary buffers used with the PAES algorithm. Specifically, a buffer processing remaining bytes smaller than AES block size was not cleared, potentially exposing sensitive data. The fix involves explicitly scrubbing this buffer and cleaning the entire parameter block in related functions.
References
- ubuntu.com/security/CVE-2026-97590 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-97590 (opens in a new tab)
- git.kernel.org/stable/c/19a218b46b2471d370c11fb52040f36ac8d05d23 (opens in a new tab)
- git.kernel.org/stable/c/d7159d2132e9aa51af7acb51c6742d9b30f987b3 (opens in a new tab)
- git.kernel.org/stable/c/7d1456d54b3c784cc2917c219a528092cefe30cd (opens in a new tab)