7.1

CVE-2026-31430: linux Out-of-bounds Read

CVSS: 7.1v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-31430DEBIAN-CVE-2026-31430
Published 20-04-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-31430 is a high (CVSS 7.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.1% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (NVD)
EPSS score
0.11%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 28 · Related 26
MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1

Timeline

  1. 20-04-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.11%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

+0.03 pp

From 0.08% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.11%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu130 products
  • linux< 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 30eae2b037af54b24109dcaea21db46f6285c69b, < 672b526def1f94c1be8eb11b885b803da0d8c2f1 | ≥ 30eae2b037af54b24109dcaea21db46f6285c69b, < 30ab358fad0c7daa1d282ec48089901b21b36a20 | ≥ 30eae2b037af54b24109dcaea21db46f6285c69b, < 206121294b9cf27f0589857f80d64f87e496ffb2 | ≥ 30eae2b037af54b24109dcaea21db46f6285c69b, < 7fb4dadc2734f4020d7543d688b8d49c8e569c61 | ≥ 30eae2b037af54b24109dcaea21db46f6285c69b, < d702c3408213bb12bd570bb97204d8340d141c51 | 6.4
  • linux_kernel≥ 6.4, < 6.6.135 | ≥ 6.7, < 6.12.82 | ≥ 6.13, < 6.18.23 | ≥ 6.19, < 6.19.13 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.12.85-1 | < 6.19.13-1

3 vendors · 133 products

References

24 links
Show all 24 references