# CVE-2026-80543: linux: In the Linux kernel, the following vulnerability has been resolved:  s390/zcrypt: Pad trailing CCA or EP11 message wi...

CVE-2026-80543 is fixed in linux on 1 platform by DEBIAN-CVE-2026-80543 (version 7.1.10-1), released September 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-80543
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 26, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.10-1 | [DEBIAN-CVE-2026-80543](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80543.md) | Sep 4, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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