{"id":"CVE-2024-26851","summary":"netfilter: nf_conntrack_h323: Add protection for bmp length out of range","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: Add protection for bmp length out of range\n\nUBSAN load reports an exception of BRK#5515 SHIFT_ISSUE:Bitwise shifts\nthat are out of bounds for their data type.\n\nvmlinux   get_bitmap(b=75) + 712\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:0\u003e\nvmlinux   decode_seq(bs=0xFFFFFFD008037000, f=0xFFFFFFD008037018, level=134443100) + 1956\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:592\u003e\nvmlinux   decode_choice(base=0xFFFFFFD0080370F0, level=23843636) + 1216\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:814\u003e\nvmlinux   decode_seq(f=0xFFFFFFD0080371A8, level=134443500) + 812\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:576\u003e\nvmlinux   decode_choice(base=0xFFFFFFD008037280, level=0) + 1216\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:814\u003e\nvmlinux   DecodeRasMessage() + 304\n\u003cnet/netfilter/nf_conntrack_h323_asn1.c:833\u003e\nvmlinux   ras_help() + 684\n\u003cnet/netfilter/nf_conntrack_h323_main.c:1728\u003e\nvmlinux   nf_confirm() + 188\n\u003cnet/netfilter/nf_conntrack_proto.c:137\u003e\n\nDue to abnormal data in skb-\u003edata, the extension bitmap length\nexceeds 32 when decoding ras message then uses the length to make\na shift operation. It will change into negative after several loop.\nUBSAN load could detect a negative shift as an undefined behaviour\nand reports exception.\nSo we add the protection to avoid the length exceeding 32. Or else\nit will return out of range error and stop decoding.","modified":"2026-04-02T10:06:11.038984Z","published":"2024-04-17T10:17:15.298Z","related":["ALSA-2024:8856","ALSA-2024:8870","SUSE-SU-2024:3189-1","SUSE-SU-2024:3190-1","SUSE-SU-2024:3194-1","SUSE-SU-2024:3195-1","SUSE-SU-2024:3209-1","SUSE-SU-2024:3251-1","SUSE-SU-2024:3252-1","SUSE-SU-2024:3383-1","SUSE-SU-2024:3483-1","SUSE-SU-2025:20044-1","SUSE-SU-2025:20047-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26851.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/014a807f1cc9c9d5173c1cd935835553b00d211c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/39001e3c42000e7c2038717af0d33c32319ad591"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4bafcc43baf7bcf93566394dbd15726b5b456b7a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/767146637efc528b5e3d31297df115e85a2fd362"},{"type":"WEB","url":"https://git.kernel.org/stable/c/80ee5054435a11c87c9a4f30f1ff750080c96416"},{"type":"WEB","url":"https://git.kernel.org/stable/c/98db42191329c679f4ca52bec0b319689e1ad8cb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b3c0f553820516ad4b62a9390ecd28d6f73a7b13"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ccd1108b16ab572d9bf635586b0925635dbd6bbc"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26851.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26851"},{"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":"98db42191329c679f4ca52bec0b319689e1ad8cb"},{"fixed":"4bafcc43baf7bcf93566394dbd15726b5b456b7a"},{"fixed":"ccd1108b16ab572d9bf635586b0925635dbd6bbc"},{"fixed":"b3c0f553820516ad4b62a9390ecd28d6f73a7b13"},{"fixed":"39001e3c42000e7c2038717af0d33c32319ad591"},{"fixed":"014a807f1cc9c9d5173c1cd935835553b00d211c"},{"fixed":"80ee5054435a11c87c9a4f30f1ff750080c96416"},{"fixed":"767146637efc528b5e3d31297df115e85a2fd362"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26851.json"}}],"schema_version":"1.7.5"}