{"id":"CVE-2026-23456","summary":"netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case","details":"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().","modified":"2026-07-09T18:31:31.278859044Z","published":"2026-04-03T15:15:37.534Z","related":["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":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23456.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1e3a3593162c96e8a8de48b1e14f60c3b57fca8a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/41b417ff73a24b2c68134992cc44c88db27f482d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/52235bf88159a1ef16434ab49e47e99c8a09ab20"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6bce72daeccca9aa1746e92d6c3d4784e71f2ebb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/774a434f8c9c8602a976b2536f65d0172a07f4d2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a2cd54b9348e485d338b3c132338a4410c99afaf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c95dc674ebf01ecfb40388b6facfc89b81fed3b7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fb6c3596823ec5dd09c2123340330d7448f51a59"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23456.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23456"},{"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":"a2cd54b9348e485d338b3c132338a4410c99afaf"},{"fixed":"c95dc674ebf01ecfb40388b6facfc89b81fed3b7"},{"fixed":"41b417ff73a24b2c68134992cc44c88db27f482d"},{"fixed":"52235bf88159a1ef16434ab49e47e99c8a09ab20"},{"fixed":"774a434f8c9c8602a976b2536f65d0172a07f4d2"},{"fixed":"6bce72daeccca9aa1746e92d6c3d4784e71f2ebb"},{"fixed":"fb6c3596823ec5dd09c2123340330d7448f51a59"},{"fixed":"1e3a3593162c96e8a8de48b1e14f60c3b57fca8a"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23456.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-2026-23456.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:L/I:N/A:H"}]}