{"id":"CVE-2026-23455","revision":"22e0332e89db43eb882c2c7229fa236d","records":[{"revision":"22e0332e89db43eb882c2c7229fa236d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23455","aliases":[],"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":0,"publishedAt":"2026-04-03T15:15:36.869+00:00","modifiedAt":"2026-10-19T18:35:44.554+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\": \"2121f5fbe88daff0f1fc5bc47d359426c74b86b0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"65fa92f79677858b14b9e4b7275f26639afe2710\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"495e97af9e7249ee02b72bb1d0848a6efc3700f4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"f5e4f4e4cdb75ec36802059a94195a31f193da60\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"633e8f87dad32263f6a57dccdb873f042c062111\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"b652b05d51003ac074b912684f9ec7486231717b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\",\n                            \"lessThan\": \"f173d0f4c0f689173f8cdac79991043a4a89bf66\",\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:H/I:N/A:H","score":9.1,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0","https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710","https://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4","https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60","https://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111","https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8","https://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b","https://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23455","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23455","identifiers":["CVE-2026-23455"]},"retained":false,"historicalAffected":[]}],"coverage":[]}