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CVE-2026-80545— s390/zcrypt: Improve EP11 CPRB length and overflow checks

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是该漏洞描述的中文翻译： 在 Linux 内核中，以下漏洞已得到解决： s390/zcrypt：改进 EP11 CPRB 长度及溢出检查 函数缺乏适当的输入验证，由此产生了安全漏洞： 1. 缺少最小尺寸验证： 结构体及后续负载字段（ 、 ）在从用户态复制时，未校验缓冲区长度是否足够。 2. 长度计算中的算术溢出：CEIL4 对齐操作可能发生溢出，从而绕过尺寸检查，导致缓冲区溢出。 3. 负载采用 ASN.1 编码，但函数仅使用简单的 C 结构体叠加方式访问负载中的部分字段。 修复方案： 在长度计算中使用 类型；

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-80545

Vulnerability Information
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Vulnerability Title
s390/zcrypt: Improve EP11 CPRB length and overflow checks
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux e2c6d91eb8b1533753755f07803e47eceed263d0 ~ 2976b9d2e716c7e5487ca7c29a7bd076cf9adf08 -
Linux Linux 7.1 -

II. Public POCs for CVE-2026-80545

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III. Intelligence Information for CVE-2026-80545

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Patches & Fixes for CVE-2026-80545 (2)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80556 mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition
CVE-2026-80554 s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80548 s390/vfio_ccw: Selectively expand io_mutex
CVE-2026-80549 s390/vfio_ccw: Move cp cleanup out of not operational
CVE-2026-80546 s390/zcrypt: Improve CCA CPRB length and overflow checks
CVE-2026-80547 s390/vfio_ccw: Implement a crw lock
CVE-2026-80543 s390/zcrypt: Pad trailing CCA or EP11 message with zeros
CVE-2026-80550 s390/vfio_ccw: Fix out of bounds check on CCW array
CVE-2026-80557 libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-80555 s390/vfio_ccw: Free all memory if cp_init() fails
CVE-2026-80559 Input: sur40 - fix input device registration ordering
CVE-2026-80558 libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80560 openrisc: signal: do not restore privileged SR bits on sigreturn
CVE-2026-80561 libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80562 gpio: ml-ioh: use raw_spinlock_t for the register lock
CVE-2026-80563 gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind
CVE-2026-80564 gve: fix NULL dereference due to missing ptp adjfine
CVE-2026-80565 crypto: qce - fix error path in devm_qce_register_algs
CVE-2026-80566 Input: hynitron_cstxxx - validate touch count and finger IDs

Showing top 20 of 92 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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