{"id":"CVE-2026-23456","revision":"3365b2e570a74ecd9913b1537a038b1b","records":[{"revision":"3365b2e570a74ecd9913b1537a038b1b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23456","aliases":[],"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":0,"publishedAt":"2026-04-03T15:15:37.534+00:00","modifiedAt":"2026-10-19T18:35:44.721+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/nf_conntrack_h323_asn1.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"a2cd54b9348e485d338b3c132338a4410c99afaf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"c95dc674ebf01ecfb40388b6facfc89b81fed3b7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"41b417ff73a24b2c68134992cc44c88db27f482d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"52235bf88159a1ef16434ab49e47e99c8a09ab20\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"774a434f8c9c8602a976b2536f65d0172a07f4d2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"6bce72daeccca9aa1746e92d6c3d4784e71f2ebb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"fb6c3596823ec5dd09c2123340330d7448f51a59\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"1e3a3593162c96e8a8de48b1e14f60c3b57fca8a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/nf_conntrack_h323_asn1.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.253\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.203\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.167\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.130\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.78\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.20\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.10\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","score":8.2,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/a2cd54b9348e485d338b3c132338a4410c99afaf","https://git.kernel.org/stable/c/c95dc674ebf01ecfb40388b6facfc89b81fed3b7","https://git.kernel.org/stable/c/41b417ff73a24b2c68134992cc44c88db27f482d","https://git.kernel.org/stable/c/52235bf88159a1ef16434ab49e47e99c8a09ab20","https://git.kernel.org/stable/c/774a434f8c9c8602a976b2536f65d0172a07f4d2","https://git.kernel.org/stable/c/6bce72daeccca9aa1746e92d6c3d4784e71f2ebb","https://git.kernel.org/stable/c/fb6c3596823ec5dd09c2123340330d7448f51a59","https://git.kernel.org/stable/c/1e3a3593162c96e8a8de48b1e14f60c3b57fca8a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23456","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23456","identifiers":["CVE-2026-23456"]},"retained":false,"historicalAffected":[]}],"coverage":[]}