High severity7.1NVD Advisory· Published Apr 20, 2026· Updated May 21, 2026
CVE-2026-31430
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
10(expand)+ 9 more
- (no CPE)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=6.4,<6.6.135
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
- (no CPE)
Patches
Vulnerability mechanics
References
5- git.kernel.org/stable/c/206121294b9cf27f0589857f80d64f87e496ffb2nvdPatch
- git.kernel.org/stable/c/30ab358fad0c7daa1d282ec48089901b21b36a20nvdPatch
- git.kernel.org/stable/c/672b526def1f94c1be8eb11b885b803da0d8c2f1nvdPatch
- git.kernel.org/stable/c/7fb4dadc2734f4020d7543d688b8d49c8e569c61nvdPatch
- git.kernel.org/stable/c/d702c3408213bb12bd570bb97204d8340d141c51nvdPatch
News mentions
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