CVE-2026-31430
HIGH
MEDIUM
Priority: 0.01
BB Relevance:
39/100
Published: 2026-04-20
Modified: 2026-11-05
First seen: 2026-11-05
Status: active
Attack Surface
Low Complexity
No Interaction
Conf. Impact
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
High
I:
None
A:
High
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.
Weakness Classification (1)
Affected Software (14)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | 30eae2b037af54b24109dcaea21db46f6285c69b < 672b526def1f94c1be8eb11b885b803da0d8c2f1 |
| Linux | Linux | 30eae2b037af54b24109dcaea21db46f6285c69b < 30ab358fad0c7daa1d282ec48089901b21b36a20 |
| Linux | Linux | 30eae2b037af54b24109dcaea21db46f6285c69b < 206121294b9cf27f0589857f80d64f87e496ffb2 |
| Linux | Linux | 30eae2b037af54b24109dcaea21db46f6285c69b < 7fb4dadc2734f4020d7543d688b8d49c8e569c61 |
| Linux | Linux | 30eae2b037af54b24109dcaea21db46f6285c69b < d702c3408213bb12bd570bb97204d8340d141c51 |
| Linux | Linux | 6.4 |
| linux | linux_kernel | 6.4 – 6.6.135 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |