CVE-2026-31746
Analyzed Analyzed - Analysis Complete
Memory Leak in Linux Kernel s390/zcrypt Driver

Publication date: 2026-05-01

Last updated on: 2026-05-07

Assigner: kernel.org

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.
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Meta Information
Published
2026-05-01
Last Modified
2026-05-07
Generated
2026-06-16
AI Q&A
2026-05-01
EPSS Evaluated
2026-06-15
NVD
CVE-2026-31746
EUVD
EUVD-2026-26559
Affected Vendors & Products
Showing 8 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 6.19 (inc) to 6.19.12 (exc)
linux linux_kernel From 6.16 (inc) to 6.18.22 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-401 The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.
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Executive Summary

This vulnerability is a memory leak in the Linux kernel related to the s390/zcrypt component when using CCA cards as accelerators for clear key RSA requests (ME and CRT). Specifically, during memory allocation for AP messages, an older allocation was not freed properly in two places, causing the first allocation to remain allocated and never released.

Impact Analysis

The impact of this vulnerability is a memory leak when using CCA cards as accelerators for clear key RSA operations. Over time, this could lead to increased memory usage and potential resource exhaustion on affected systems, which might degrade system performance or cause instability.

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