What’s Vulnerable › Vulnerabilities

CVE-2026-31746: s390/zcrypt: Fix memory leak with CCA cards used as accelerator

• Severity: medium (CVSS 5.5 v3.1)
• 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: 2026-05-01 · updated 2026-10-21
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Fix memory leak with CCA cards used as accelerator Tests showed that there is a memory leak if CCA cards are used as accelerator for clear key RSA requests (ME and CRT). With the last rework for the memory allocation the AP messages are allocated by ap_init_apmsg() but for some reason on two places (ME and CRT) the older allocation was still in place. So the first allocation simple was never freed.

Affected products

• Linux kernel: from 6.16 before 6.18.22; from 6.19 before 6.19.12; 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5, 7.0-rc6 — fixed in 6.18.22, 6.19.12

How to fix

Upgrade to a fixed version: Linux kernel 6.18.22, 6.19.12. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1650268579e1113b30402dbcca4dba6589a0fccf
• https://git.kernel.org/stable/c/586222c37d4027dbf60a604fbe820184fee7c1c9
• https://git.kernel.org/stable/c/ace37bfec3822033e59fff390f2ff99fc96ebe4f
• https://git.kernel.org/stable/c/c8d46f17c2fc7d25c18e60c008928aecab26184d

Get alerted when CVE-2026-31746 or the next vulnerability affects your stack