What’s Vulnerable › Vulnerabilities

CVE-2026-98387: s390/crypto: Fix skcipher_walk return code handling in aes_s390

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: s390/crypto: Fix skcipher_walk return code handling in aes_s390 The return codes from skcipher_walk_virt() were not properly checked before entering the processing loops in ecb_aes_crypt() and ctr_aes_crypt(). If skcipher_walk_virt() fails, the walk structure may be in an undefined state, and attempting to process data could lead to incorrect behavior or accessing uninitialized memory. Add proper return code checking to ensure correct handling of the walk initialization and walk advance and eventually return to the caller with that return code.

Affected products

• Linux kernel: 5.5 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/15fa028589c3a2545f0bff355eff06d5844196bf
• https://git.kernel.org/stable/c/35c3f97569306050e818fa18e17fa97c358f0f28
• https://git.kernel.org/stable/c/89b58645646d1dac34162cc2597f42266bfbf930
• https://git.kernel.org/stable/c/aea3e1588f08e381a7a57b2bf1a60cc2347904cd

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