# CVE-2026-80545: linux: In the Linux kernel, the following vulnerability has been resolved:  s390/zcrypt: Improve EP11 CPRB length and overfl...

CVE-2026-80545 is fixed in linux on 1 platform by DEBIAN-CVE-2026-80545 (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-2026-80545
- 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 EP11 CPRB length and overflow checks  The xcrb_msg_to_type6_ep11cprb_msgx() function lacks proper input validation, creating security vulnerabilities: 1. Missing minimum size validation: The ep11_cprb structure and    subsequent payload fields (pld_tag, pld_lenfmt) are copied from    userspace without verifying sufficient buffer length. 2. Arithmetic overflow in length calculations: CEIL4 alignment could    overflow, bypassing size checks and enabling buffer overflows. 3. The payload is asn1 encoded but the function just uses a simple c    struct overlay to access some fields of the payload.  Fix by using size_t for length calculations, adding U32_MAX boundary checks after alignment, and validating minimum request size and minimum reply size before copying from userspace. Do a very simple asn1 parsing of the payload up to the function value field.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.10-1 | [DEBIAN-CVE-2026-80545](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80545.md) | Sep 4, 2026 |

---

Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.