s390/zcrypt: Fix memory leak with CCA cards used as accelerator

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Summary

CVECVE-2026-31746
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:37 UTC
Updated2026-05-07 19:29:56 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000170000 probability, percentile 0.040610000 (date 2026-05-05)

Problem Types: CWE-401

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 57db62a130ce69e6f3a870cf1119d8f860391f97 586222c37d4027dbf60a604fbe820184fee7c1c9 git Not specified
CNA Linux Linux affected 57db62a130ce69e6f3a870cf1119d8f860391f97 ace37bfec3822033e59fff390f2ff99fc96ebe4f git Not specified
CNA Linux Linux affected 57db62a130ce69e6f3a870cf1119d8f860391f97 c8d46f17c2fc7d25c18e60c008928aecab26184d git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/586222c37d4027dbf60a604fbe820184fee7c1c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ace37bfec3822033e59fff390f2ff99fc96ebe4f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c8d46f17c2fc7d25c18e60c008928aecab26184d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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