What’s Vulnerable › Vulnerabilities

CVE-2026-80543: s390/zcrypt: Pad trailing CCA or EP11 message with zeros

• 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: 2026-08-26 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Pad trailing CCA or EP11 message with zeros The both functions xcrb_msg_to_type6cprb_msgx() and xcrb_msg_to_type6_ep11cprb_msgx() copy the user space message into a kernel buffer based on the message length. But on further processing the message is supposed to be 4 byte length adjusted. Thus up to 3 bytes of uninitialized kernel memory are forwarded to further processing steps and may unwanted expose kernel memory to the crypto card firmware. This patch contains code to pad the gap between user space copied message and message buffer length sent down to further processing of the CCA or EP11 message to zeros.

Affected products

• Linux kernel: from 6.12.114 before 6.13; 7.1 — fixed in 6.13, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.13, 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2db92a56b000173d332b6c30f38a5a4444e4355a
• https://git.kernel.org/stable/c/44e61f1834831f873af5a4fec5a5e432b929c6a2
• https://git.kernel.org/stable/c/eb363254472493e3458156fc11fd56dca92f4333

Get alerted when CVE-2026-80543 or the next vulnerability affects your stack