VulnerabilityPublished 1 May 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c8d46f17c2fc7d25c18e60c008928aecab26184d : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c8d46f17c2fc7d25c18e60c008928aecab26184d, ace37bfec3822033e59fff390f2ff99fc96ebe4f, 1650268579e1113b30402dbcca4dba6589a0fccf +1

Exploitation evidence

Disclosed: evidence found.
CVE published 1 May 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to c8d46f17c2fc7d25c18e60c008928aecab26184d, ace37bfec3822033e59fff390f2ff99fc96ebe4f, 1650268579e1113b30402dbcca4dba6589a0fccf or 586222c37d4027dbf60a604fbe820184fee7c1c9.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 57db62a130ce69e6f3a870cf1119d8f860391f97, < c8d46f17c2fc7d25c18e60c008928aecab26184d	Fixed in c8d46f17c2fc7d25c18e60c008928aecab26184d
LinuxLinux	Affected ≥ 57db62a130ce69e6f3a870cf1119d8f860391f97, < ace37bfec3822033e59fff390f2ff99fc96ebe4f	Fixed in ace37bfec3822033e59fff390f2ff99fc96ebe4f
LinuxLinux	Affected ≥ 919b3885c293057061af32dfeb0e20bba4f7a378, < 1650268579e1113b30402dbcca4dba6589a0fccf	Fixed in 1650268579e1113b30402dbcca4dba6589a0fccf
LinuxLinux	Affected ≥ 57db62a130ce69e6f3a870cf1119d8f860391f97, < 586222c37d4027dbf60a604fbe820184fee7c1c9	Fixed in 586222c37d4027dbf60a604fbe820184fee7c1c9
LinuxLinux	Affected =6.16	Fixed in–

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.

References

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