{"api_version":"1","generated_at":"2026-04-19T01:13:28+00:00","cve":"CVE-2026-23456","urls":{"html":"https://cve.report/CVE-2026-23456","api":"https://cve.report/api/cve/CVE-2026-23456.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-23456","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-23456"},"summary":{"title":"netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case\n\nIn decode_int(), the CONS case calls get_bits(bs, 2) to read a length\nvalue, then calls get_uint(bs, len) without checking that len bytes\nremain in the buffer. The existing boundary check only validates the\n2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint()\nreads. This allows a malformed H.323/RAS packet to cause a 1-4 byte\nslab-out-of-bounds read.\n\nAdd a boundary check for len bytes after get_bits() and before\nget_uint().","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/c95dc674ebf01ecfb40388b6facfc89b81fed3b7","name":"https://git.kernel.org/stable/c/c95dc674ebf01ecfb40388b6facfc89b81fed3b7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fb6c3596823ec5dd09c2123340330d7448f51a59","name":"https://git.kernel.org/stable/c/fb6c3596823ec5dd09c2123340330d7448f51a59","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/774a434f8c9c8602a976b2536f65d0172a07f4d2","name":"https://git.kernel.org/stable/c/774a434f8c9c8602a976b2536f65d0172a07f4d2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/52235bf88159a1ef16434ab49e47e99c8a09ab20","name":"https://git.kernel.org/stable/c/52235bf88159a1ef16434ab49e47e99c8a09ab20","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1e3a3593162c96e8a8de48b1e14f60c3b57fca8a","name":"https://git.kernel.org/stable/c/1e3a3593162c96e8a8de48b1e14f60c3b57fca8a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a2cd54b9348e485d338b3c132338a4410c99afaf","name":"https://git.kernel.org/stable/c/a2cd54b9348e485d338b3c132338a4410c99afaf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6bce72daeccca9aa1746e92d6c3d4784e71f2ebb","name":"https://git.kernel.org/stable/c/6bce72daeccca9aa1746e92d6c3d4784e71f2ebb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/41b417ff73a24b2c68134992cc44c88db27f482d","name":"https://git.kernel.org/stable/c/41b417ff73a24b2c68134992cc44c88db27f482d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23456","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23456","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e35941d990123f155b02d5663e51a24f816b6f3 a2cd54b9348e485d338b3c132338a4410c99afaf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e35941d990123f155b02d5663e51a24f816b6f3 c95dc674ebf01ecfb40388b6facfc89b81fed3b7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e35941d990123f155b02d5663e51a24f816b6f3 41b417ff73a24b2c68134992cc44c88db27f482d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e35941d990123f155b02d5663e51a24f816b6f3 52235bf88159a1ef16434ab49e47e99c8a09ab20 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":"23456","cve":"CVE-2026-23456","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":"a2cd54b9348e485d338b3c132338a4410c99afaf","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"c95dc674ebf01ecfb40388b6facfc89b81fed3b7","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"41b417ff73a24b2c68134992cc44c88db27f482d","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"52235bf88159a1ef16434ab49e47e99c8a09ab20","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"774a434f8c9c8602a976b2536f65d0172a07f4d2","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"6bce72daeccca9aa1746e92d6c3d4784e71f2ebb","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"fb6c3596823ec5dd09c2123340330d7448f51a59","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"1e3a3593162c96e8a8de48b1e14f60c3b57fca8a","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: fix OOB read in decode_int() CONS case\n\nIn decode_int(), the CONS case calls get_bits(bs, 2) to read a length\nvalue, then calls get_uint(bs, len) without checking that len bytes\nremain in the buffer. The existing boundary check only validates the\n2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint()\nreads. This allows a malformed H.323/RAS packet to cause a 1-4 byte\nslab-out-of-bounds read.\n\nAdd a boundary check for len bytes after get_bits() and before\nget_uint()."}],"providerMetadata":{"dateUpdated":"2026-04-18T08:59:05.486Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a2cd54b9348e485d338b3c132338a4410c99afaf"},{"url":"https://git.kernel.org/stable/c/c95dc674ebf01ecfb40388b6facfc89b81fed3b7"},{"url":"https://git.kernel.org/stable/c/41b417ff73a24b2c68134992cc44c88db27f482d"},{"url":"https://git.kernel.org/stable/c/52235bf88159a1ef16434ab49e47e99c8a09ab20"},{"url":"https://git.kernel.org/stable/c/774a434f8c9c8602a976b2536f65d0172a07f4d2"},{"url":"https://git.kernel.org/stable/c/6bce72daeccca9aa1746e92d6c3d4784e71f2ebb"},{"url":"https://git.kernel.org/stable/c/fb6c3596823ec5dd09c2123340330d7448f51a59"},{"url":"https://git.kernel.org/stable/c/1e3a3593162c96e8a8de48b1e14f60c3b57fca8a"}],"title":"netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-23456","datePublished":"2026-04-03T15:15:37.534Z","dateReserved":"2026-01-13T15:37:46.020Z","dateUpdated":"2026-04-18T08:59:05.486Z","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":"23456","Ordinal":"1","Title":"netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS ","CVE":"CVE-2026-23456","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"23456","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case\n\nIn decode_int(), the CONS case calls get_bits(bs, 2) to read a length\nvalue, then calls get_uint(bs, len) without checking that len bytes\nremain in the buffer. The existing boundary check only validates the\n2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint()\nreads. This allows a malformed H.323/RAS packet to cause a 1-4 byte\nslab-out-of-bounds read.\n\nAdd a boundary check for len bytes after get_bits() and before\nget_uint().","Type":"Description","Title":"netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS "}]}}}