{"id":"CVE-2026-23455","summary":"netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()","details":"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.","modified":"2026-07-09T18:30:24.709858642Z","published":"2026-04-03T15:15:36.869Z","related":["ALSA-2026:21556","ALSA-2026:21557","ALSA-2026:21706","ALSA-2026:21745","SUSE-SU-2026:2068-1","SUSE-SU-2026:21834-1","SUSE-SU-2026:21841-1","SUSE-SU-2026:21845-1","SUSE-SU-2026:21860-1","SUSE-SU-2026:21876-1","SUSE-SU-2026:21877-1","SUSE-SU-2026:21916-1","SUSE-SU-2026:21919-1","SUSE-SU-2026:2217-1","SUSE-SU-2026:2238-1","openSUSE-SU-2026:20826-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23455.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111"},{"type":"WEB","url":"https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23455.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23455"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5e35941d990123f155b02d5663e51a24f816b6f3"},{"fixed":"2121f5fbe88daff0f1fc5bc47d359426c74b86b0"},{"fixed":"65fa92f79677858b14b9e4b7275f26639afe2710"},{"fixed":"495e97af9e7249ee02b72bb1d0848a6efc3700f4"},{"fixed":"f5e4f4e4cdb75ec36802059a94195a31f193da60"},{"fixed":"633e8f87dad32263f6a57dccdb873f042c062111"},{"fixed":"9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8"},{"fixed":"b652b05d51003ac074b912684f9ec7486231717b"},{"fixed":"f173d0f4c0f689173f8cdac79991043a4a89bf66"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23455.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.17"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.167"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.20"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23455.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}