Answer in brief
CVE-2026-31430 records a Unknown severity vulnerability in X.509: Fix out-of-bounds access when parsing extensions. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 6.4 | Not reported |
| Linux/Linuxgeneric | >=30eae2b037af54b24109dcaea21db46f6285c69b <672b526def1f94c1be8eb11b885b803da0d8c2f1 || >=30eae2b037af54b24109dcaea21db46f6285c69b <30ab358fad0c7daa1d282ec48089901b21b36a20 || >=30eae2b037af54b24109dcaea21db46f6285c69b <206121294b9cf27f0589857f80d64f87e496ffb2 || >=30eae2b037af54b24109dcaea21db46f6285c69b <7fb4dadc2734f4020d7543d688b8d49c8e569c61 || >=30eae2b037af54b24109dcaea21db46f6285c69b <d702c3408213bb12bd570bb97204d8340d141c51 | 672b526def1f94c1be8eb11b885b803da0d8c2f1, 30ab358fad0c7daa1d282ec48089901b21b36a20, 206121294b9cf27f0589857f80d64f87e496ffb2, 7fb4dadc2734f4020d7543d688b8d49c8e569c61, d702c3408213bb12bd570bb97204d8340d141c51 |
Published upstream
Apr 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.