CVE-2026-31430
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.
How to fix
- linux linux_kernel6.6.135, 6.12.82, 6.18.23, 6.19.13 or later
- git.kernel.org/stable/c/206121294b9cf27f0589857f80d64f87e496ffb2
- git.kernel.org/stable/c/30ab358fad0c7daa1d282ec48089901b21b36a20
- git.kernel.org/stable/c/672b526def1f94c1be8eb11b885b803da0d8c2f1
- git.kernel.org/stable/c/7fb4dadc2734f4020d7543d688b8d49c8e569c61
- git.kernel.org/stable/c/d702c3408213bb12bd570bb97204d8340d141c51
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.4 ≤ v < 6.6.135, 6.7 ≤ v < 6.12.82, 6.13 ≤ v < 6.18.23, 6.19 ≤ v < 6.19.13, 7.0 | 6.6.135, 6.12.82, 6.18.23, 6.19.13 |
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