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CVE-2026-31430

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 pr
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1dfea9f1bd949ef2d52eb93f490e9b65f67797c57c51ec6f04500983282a60e3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","product":"Linux","programFiles":["crypto/asymmetric_keys/x509_cert_parser.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"672b526def1f94c1be8eb11b885b803da0d8c2f1","status":"affected","version":"30eae2b037af54b24109dcaea21db46f6285c69b","versionType":"git"},{"lessThan":"30ab358fad0c7daa1d282ec48089901b21b36a20","status":"affected","version":"30eae2b037af54b24109dcaea21db46f6285c69b","versionType":"git"},{"lessThan":"206121294b9cf27f0589857f80d64f87e496ffb2","status":"affected","version":"30ea…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c9851d1350dcf183cb5a18013a14f0a989818371e5e3695630783f0106d7c2bc · sha256:cb96c9bd9474deba… · /containers/cna/affected/0

{"defaultStatus":"affected","product":"Linux","programFiles":["crypto/asymmetric_keys/x509_cert_parser.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.4"},{"lessThan":"6.4","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.135","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.82","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.23","versionType":"se…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c9851d1350dcf183cb5a18013a14f0a989818371e5e3695630783f0106d7c2bc · sha256:cb96c9bd9474deba… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","product":"Linux","programFiles":["crypto/asymmetric_keys/x509_cert_parser.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"672b526def1f94c1be8eb11b885b803da0d8c2f1","status":"affected","version":"30eae2b037af54b24109dcaea21db46f6285c69b","versionType":"git"},{"lessThan":"30ab358fad0c7daa1d282ec48089901b21b36a20","status":"affected","version":"30eae2b037af54b24109dcaea21db46f6285c69b","versionType":"git"},{"lessThan":"206121294b9cf27f0589857f80d64f87e496ffb2","status":"affected","version":"30ea…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c9851d1350dcf183cb5a18013a14f0a989818371e5e3695630783f0106d7c2bc · sha256:cb96c9bd9474deba… · /containers/cna/affected/0
{"defaultStatus":"affected","product":"Linux","programFiles":["crypto/asymmetric_keys/x509_cert_parser.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.4"},{"lessThan":"6.4","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.135","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.82","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.23","versionType":"se…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c9851d1350dcf183cb5a18013a14f0a989818371e5e3695630783f0106d7c2bc · sha256:cb96c9bd9474deba… · /containers/cna/affected/1

Source references

5 source assertions
{"url":"https://git.kernel.org/stable/c/206121294b9cf27f0589857f80d64f87e496ffb2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c9851d1350dcf183cb5a18013a14f0a989818371e5e3695630783f0106d7c2bc · sha256:cb96c9bd9474deba… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/30ab358fad0c7daa1d282ec48089901b21b36a20"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c9851d1350dcf183cb5a18013a14f0a989818371e5e3695630783f0106d7c2bc · sha256:cb96c9bd9474deba… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/672b526def1f94c1be8eb11b885b803da0d8c2f1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c9851d1350dcf183cb5a18013a14f0a989818371e5e3695630783f0106d7c2bc · sha256:cb96c9bd9474deba… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/7fb4dadc2734f4020d7543d688b8d49c8e569c61"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c9851d1350dcf183cb5a18013a14f0a989818371e5e3695630783f0106d7c2bc · sha256:cb96c9bd9474deba… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/d702c3408213bb12bd570bb97204d8340d141c51"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c9851d1350dcf183cb5a18013a14f0a989818371e5e3695630783f0106d7c2bc · sha256:cb96c9bd9474deba… · /containers/cna/references/4

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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