CVE-2026-98387: Linux kernel · s390/crypto: Fix skcipher_walk return code handling in aes_s390
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in aea3e1588f08e381a7a57b2bf1a60cc2347904cd : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated Medium by Threat Radar's AI analysis · 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.
- Patch
- Available – fixed in aea3e1588f08e381a7a57b2bf1a60cc2347904cd, 89b58645646d1dac34162cc2597f42266bfbf930, 35c3f97569306050e818fa18e17fa97c358f0f28 +1
Exploitation evidence
Disclosed: evidence found.
CVE published 14 Oct 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
Upgrade Linux kernel to aea3e1588f08e381a7a57b2bf1a60cc2347904cd, 89b58645646d1dac34162cc2597f42266bfbf930, 35c3f97569306050e818fa18e17fa97c358f0f28 or 15fa028589c3a2545f0bff355eff06d5844196bf.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A patch is available and has been applied in fixed versions identified by specific commit hashes. Users running the affected Linux kernel version 5.5 should update to a fixed version containing these commits to remediate the vulnerability. Since this is a kernel-level fix, applying the official kernel update is the recommended mitigation.
Description
A vulnerability in the Linux kernel's s390 cryptographic implementation was fixed by correcting the handling of return codes from skcipher_walk_virt() in the aes_s390 module. Improper checking of these return codes before processing loops could lead to undefined states and potentially incorrect behavior or access to uninitialized memory.
References
- git.kernel.org/stable/c/89b58645646d1dac34162cc2597f42266bfbf930 (opens in a new tab)
- git.kernel.org/stable/c/35c3f97569306050e818fa18e17fa97c358f0f28 (opens in a new tab)
- git.kernel.org/stable/c/aea3e1588f08e381a7a57b2bf1a60cc2347904cd (opens in a new tab)
- git.kernel.org/stable/c/15fa028589c3a2545f0bff355eff06d5844196bf (opens in a new tab)