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CVE-2026-68451— s390/zcrypt: Validate length for CCA ECC private key requests

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于对CCA ECC私钥请求中令牌长度验证不足，可能导致越界访问。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fa6999e326fe7851ecbd572b8cb9be8e930ebf41< 7dc306ff7c4d951582adaae65e0aee9fb4968dbe affected
fa6999e326fe7851ecbd572b8cb9be8e930ebf41< 447a37a6bef11bfd3645069e380460b11386e2b9 affected
fa6999e326fe7851ecbd572b8cb9be8e930ebf41< f0831f13c42c1261d449dcee8a035e1c6cd9fcaa affected
fa6999e326fe7851ecbd572b8cb9be8e930ebf41< dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e affected
fa6999e326fe7851ecbd572b8cb9be8e930ebf41< ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5 affected
fa6999e326fe7851ecbd572b8cb9be8e930ebf41< 013a4484f061a2b41f052e25c0015203287e63f1 affected
fa6999e326fe7851ecbd572b8cb9be8e930ebf41< 8fa3e9435a13c335efb63fb4f4e77531a0031159 affected
fa6999e326fe7851ecbd572b8cb9be8e930ebf41< a9ae0f6dd45c3ccc1d69363f7aea8af179122730 affected
… +10 more rows
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I. Basic Information for CVE-2026-68451

Vulnerability Information
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Vulnerability Title
s390/zcrypt: Validate length for CCA ECC private key requests
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Validate length for CCA ECC private key requests cca_ecc2protkey() derives the copy length for the CPRB parameter block directly from the length field in the key token. Reject the request early if the token length exceeds the available space in the parameter block.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于对CCA ECC私钥请求中令牌长度验证不足，可能导致越界访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux fa6999e326fe7851ecbd572b8cb9be8e930ebf41 ~ 7dc306ff7c4d951582adaae65e0aee9fb4968dbe -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-68451

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III. Intelligence Information for CVE-2026-68451

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Patches & Fixes for CVE-2026-68451 (7)

Same Patch Batch · Linux · 2026-08-13 · 4 CVEs total

CVE-2026-68454 8.8 HIGH KVM: s390: pci: Fix handling of AIF enable without AISB
CVE-2026-68452 7.8 HIGH s390/zcrypt: Validate length for CCA AES cipher key requests
CVE-2026-68453 7.1 HIGH s390/zcrypt: Fix buffer over-read in cca_cipher2protkey

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68451

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