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CVE-2026-68452— s390/zcrypt: Validate length for CCA AES cipher 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 AES密钥请求的长度验证不足，可能导致内存越界。

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 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< be037204e4f595e4bd2159acda146677a1dc6342 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 4e500ecb6704d879f9c2417c2ed6faba595015ca affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 7f9e5a3dbb14a9b321a1dfa30390402c673f82dc affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 406b317ea2b501f6f5eca1264293c9399a73a778 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 4fc46deceda076d429ef3fab2ccf8d96629ebd23 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< ad93a1f1a45652478c0cf4eb029114e03af57f3b affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 3859f630b674801a00bca39bc451f52288591f65 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 06afe425d5283b9764303de47f554da5a808ce8a affected
… +10 more rows
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I. Basic Information for CVE-2026-68452

Vulnerability Information
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Vulnerability Title
s390/zcrypt: Validate length for CCA AES cipher 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 AES cipher key requests cca_cipher2protkey() 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 AES密钥请求的长度验证不足，可能导致内存越界。
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 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd ~ be037204e4f595e4bd2159acda146677a1dc6342 -
Linux Linux 5.4 -

II. Public POCs for CVE-2026-68452

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III. Intelligence Information for CVE-2026-68452

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Patches & Fixes for CVE-2026-68452 (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-2026-68451 7.8 HIGH s390/zcrypt: Validate length for CCA ECC private 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-2026-68452

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