CVE-2026-80543

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.

Package Linux Kernel
Published 2026-08-26
Last modified 2026-08-26
Patch available
Yes

Affected versions

Linux kernel versions 7.1 and later are affected. Fixed in 7.1.10, 7.2 and their respective stable series.

Affected from
≥ 7.1
Fixed in
✓ 7.1.10 7.1.x ✓ 7.2

References

2 total

Frequently asked questions

  • What is CVE-2026-80543?

    CVE-2026-80543 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 7.1 onward and has been patched in 7.1.10 and 7.2. CVE-2026-80543 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • Is there a patch available for CVE-2026-80543?

    Yes. CVE-2026-80543 has been patched. Fixed versions include 7.1.10 and 7.2. If you are running Linux kernel 7.1 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-80543 actively exploited?

    No. CVE-2026-80543 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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