Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-68453— s390/zcrypt: Fix buffer over-read in cca_cipher2protkey

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CCA token结构中用户可控的len字段未进行正确验证，可能导致缓冲区越界读取或缓冲区下溢，造成内核崩溃或内存泄露。

CVSS 7.1 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< a57fd7fcdb63e2d5ceac78bbe825ec986062a9da affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 3b2abee2a678607ae27975bc6833785c2002df43 affected
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd< 36b230835b8a008266aad22168ca52afacc8a58d affected
5.4 affected
< 5.4 unaffected
6.18.44≤ 6.18.* unaffected
7.1.8≤ 7.1.* unaffected
7.2≤ * unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-68453

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
s390/zcrypt: Fix buffer over-read in cca_cipher2protkey
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Fix buffer over-read in cca_cipher2protkey Add validation of both the actual key buffer size and token length fields in all the cca_check_sec*token() functions. Additionally check in cca_gencipherkey() for possible underflow with returned key size. The CCA token structures contain user-controlled len fields that were used in operations without proper validation against both the actual buffer size and minimum token structure size. An attacker could set this field larger than the actual buffer size, leading to reading beyond buffer boundaries. This may result in a kernel crash or exposure of memory via sending this as part of a request down to the crypto card. Also an attacker could have used a very small len value and thus enforce a buffer under-run which may produce similar effects as a over-read. So now a key must - key buf length must be at least sizeof the token struct - the key len field inside the token must fit into the range of sizeof key token struct ... key buf length
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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CCA token结构中用户可控的len字段未进行正确验证，可能导致缓冲区越界读取或缓冲区下溢，造成内核崩溃或内存泄露。
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 ~ a57fd7fcdb63e2d5ceac78bbe825ec986062a9da -
Linux Linux 5.4 -

II. Public POCs for CVE-2026-68453

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-68453

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-68453 (2)

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-2026-68452 7.8 HIGH s390/zcrypt: Validate length for CCA AES cipher key requests

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68453

No comments yet

Leave a comment