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CVE-2026-31430— X.509: Fix out-of-bounds access when parsing extensions

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于解析X.509证书扩展时未检查长度即读取数据，可能导致越界访问。

AI Predicted 7.8 Difficulty: Easy EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 30eae2b037af54b24109dcaea21db46f6285c69b< 672b526def1f94c1be8eb11b885b803da0d8c2f1 affected
30eae2b037af54b24109dcaea21db46f6285c69b< 30ab358fad0c7daa1d282ec48089901b21b36a20 affected
30eae2b037af54b24109dcaea21db46f6285c69b< 206121294b9cf27f0589857f80d64f87e496ffb2 affected
30eae2b037af54b24109dcaea21db46f6285c69b< 7fb4dadc2734f4020d7543d688b8d49c8e569c61 affected
30eae2b037af54b24109dcaea21db46f6285c69b< d702c3408213bb12bd570bb97204d8340d141c51 affected
6.4 affected
< 6.4 unaffected
6.6.135≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-31430

Vulnerability Information
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Vulnerability Title
X.509: Fix out-of-bounds access when parsing extensions
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: X.509: Fix out-of-bounds access when parsing extensions Leo reports an out-of-bounds access when parsing a certificate with empty Basic Constraints or Key Usage extension because the first byte of the extension is read before checking its length. Fix it. The bug can be triggered by an unprivileged user by submitting a specially crafted certificate to the kernel through the keyrings(7) API. Leo has demonstrated this with a proof-of-concept program responsibly disclosed off-list.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于解析X.509证书扩展时未检查长度即读取数据，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 30eae2b037af54b24109dcaea21db46f6285c69b ~ 672b526def1f94c1be8eb11b885b803da0d8c2f1 -
Linux Linux 6.4 -

II. Public POCs for CVE-2026-31430

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III. Intelligence Information for CVE-2026-31430

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IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31430

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