{"api_version":"1","generated_at":"2026-04-19T01:13:28+00:00","cve":"CVE-2026-23455","urls":{"html":"https://cve.report/CVE-2026-23455","api":"https://cve.report/api/cve/CVE-2026-23455.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-23455","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-23455"},"summary":{"title":"netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: check for zero length in DecodeQ931()\n\nIn DecodeQ931(), the UserUserIE code path reads a 16-bit length from\nthe packet, then decrements it by 1 to skip the protocol discriminator\nbyte before passing it to DecodeH323_UserInformation(). If the encoded\nlength is 0, the decrement wraps to -1, which is then passed as a\nlarge value to the decoder, leading to an out-of-bounds read.\n\nAdd a check to ensure len is positive after the decrement.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-03 16:16:32","updated_at":"2026-04-18 09:16:28"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0","name":"https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710","name":"https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8","name":"https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4","name":"https://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b","name":"https://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111","name":"https://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60","name":"https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66","name":"https://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23455","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23455","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e35941d990123f155b02d5663e51a24f816b6f3 2121f5fbe88daff0f1fc5bc47d359426c74b86b0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e35941d990123f155b02d5663e51a24f816b6f3 65fa92f79677858b14b9e4b7275f26639afe2710 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e35941d990123f155b02d5663e51a24f816b6f3 495e97af9e7249ee02b72bb1d0848a6efc3700f4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e35941d990123f155b02d5663e51a24f816b6f3 f5e4f4e4cdb75ec36802059a94195a31f193da60 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.167 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.130 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.20 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.10 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"23455","cve":"CVE-2026-23455","epss":"0.000320000","percentile":"0.090980000","score_date":"2026-04-18","updated_at":"2026-04-19 00:10:43"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_h323_asn1.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2121f5fbe88daff0f1fc5bc47d359426c74b86b0","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"65fa92f79677858b14b9e4b7275f26639afe2710","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"495e97af9e7249ee02b72bb1d0848a6efc3700f4","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"f5e4f4e4cdb75ec36802059a94195a31f193da60","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"633e8f87dad32263f6a57dccdb873f042c062111","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"b652b05d51003ac074b912684f9ec7486231717b","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"f173d0f4c0f689173f8cdac79991043a4a89bf66","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_h323_asn1.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.17"},{"lessThan":"2.6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.20","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.20","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.10","versionStartIncluding":"2.6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"2.6.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: check for zero length in DecodeQ931()\n\nIn DecodeQ931(), the UserUserIE code path reads a 16-bit length from\nthe packet, then decrements it by 1 to skip the protocol discriminator\nbyte before passing it to DecodeH323_UserInformation(). If the encoded\nlength is 0, the decrement wraps to -1, which is then passed as a\nlarge value to the decoder, leading to an out-of-bounds read.\n\nAdd a check to ensure len is positive after the decrement."}],"providerMetadata":{"dateUpdated":"2026-04-18T08:59:04.151Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0"},{"url":"https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710"},{"url":"https://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4"},{"url":"https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60"},{"url":"https://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111"},{"url":"https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8"},{"url":"https://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b"},{"url":"https://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66"}],"title":"netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-23455","datePublished":"2026-04-03T15:15:36.869Z","dateReserved":"2026-01-13T15:37:46.020Z","dateUpdated":"2026-04-18T08:59:04.151Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-03 16:16:32","lastModifiedDate":"2026-04-18 09:16:28","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"23455","Ordinal":"1","Title":"netfilter: nf_conntrack_h323: check for zero length in DecodeQ93","CVE":"CVE-2026-23455","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"23455","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: check for zero length in DecodeQ931()\n\nIn DecodeQ931(), the UserUserIE code path reads a 16-bit length from\nthe packet, then decrements it by 1 to skip the protocol discriminator\nbyte before passing it to DecodeH323_UserInformation(). If the encoded\nlength is 0, the decrement wraps to -1, which is then passed as a\nlarge value to the decoder, leading to an out-of-bounds read.\n\nAdd a check to ensure len is positive after the decrement.","Type":"Description","Title":"netfilter: nf_conntrack_h323: check for zero length in DecodeQ93"}]}}}