# CVE-2026-80546: linux: In the Linux kernel, the following vulnerability has been resolved:  s390/zcrypt: Improve CCA CPRB length and overflo...

CVE-2026-80546 is fixed in linux on 1 platform by DEBIAN-CVE-2026-80546 (version 7.1.10-1), released September 4, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-80546
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0019
- 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: Improve CCA CPRB length and overflow checks  The xcrb_msg_to_type6cprb_msgx() function lacks proper input validation, creating security vulnerabilities: 1. Integer overflow after CEIL4 alignment: Signed int variables could    overflow during 4-byte boundary alignment, causing undersized    buffer allocations or incorrect bounds checking. 2. Missing minimum size validation: The CPRBX structure is copied from    userspace without verifying sufficient buffer length. Undersized    buffers cause uninitialized memory access when reading structure    fields like cprbx.cprb_len and cprbx.domain. 3. Arithmetic overflow in sum calculations: Adding control block and    data block sizes could overflow, bypassing size checks and enabling    buffer overflows.  Fix by using size_t for length calculations, adding U32_MAX boundary checks after alignment, validating minimum control block size before copying from userspace, and detecting sum calculation overflows.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.10-1 | [DEBIAN-CVE-2026-80546](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80546.md) | Sep 4, 2026 |

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Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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