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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.","state":"PUBLISHED","assigner":"Linux","published_at":"2024-04-17 11:15:08","updated_at":"2026-05-12 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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<net/netfilter/nf_conntrack_h323_asn1.c:0>\nvmlinux   decode_seq(bs=0xFFFFFFD008037000, f=0xFFFFFFD008037018, level=134443100) + 1956\n<net/netfilter/nf_conntrack_h323_asn1.c:592>\nvmlinux   decode_choice(base=0xFFFFFFD0080370F0, level=23843636) + 1216\n<net/netfilter/nf_conntrack_h323_asn1.c:814>\nvmlinux   decode_seq(f=0xFFFFFFD0080371A8, level=134443500) + 812\n<net/netfilter/nf_conntrack_h323_asn1.c:576>\nvmlinux   decode_choice(base=0xFFFFFFD008037280, level=0) + 1216\n<net/netfilter/nf_conntrack_h323_asn1.c:814>\nvmlinux   DecodeRasMessage() + 304\n<net/netfilter/nf_conntrack_h323_asn1.c:833>\nvmlinux   ras_help() + 684\n<net/netfilter/nf_conntrack_h323_main.c:1728>\nvmlinux   nf_confirm() + 188\n<net/netfilter/nf_conntrack_proto.c:137>\n\nDue to abnormal data in skb->data, 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."}],"providerMetadata":{"dateUpdated":"2026-05-11T20:05:21.167Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/98db42191329c679f4ca52bec0b319689e1ad8cb"},{"url":"https://git.kernel.org/stable/c/4bafcc43baf7bcf93566394dbd15726b5b456b7a"},{"url":"https://git.kernel.org/stable/c/ccd1108b16ab572d9bf635586b0925635dbd6bbc"},{"url":"https://git.kernel.org/stable/c/b3c0f553820516ad4b62a9390ecd28d6f73a7b13"},{"url":"https://git.kernel.org/stable/c/39001e3c42000e7c2038717af0d33c32319ad591"},{"url":"https://git.kernel.org/stable/c/014a807f1cc9c9d5173c1cd935835553b00d211c"},{"url":"https://git.kernel.org/stable/c/80ee5054435a11c87c9a4f30f1ff750080c96416"},{"url":"https://git.kernel.org/stable/c/767146637efc528b5e3d31297df115e85a2fd362"}],"title":"netfilter: nf_conntrack_h323: Add protection for bmp length out of 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12:16:20","problem_types":["CWE-787"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.17","versionEndExcluding":"4.19.310","matchCriteriaId":"2376FDE6-6EC1-445C-9CBA-98C1D1D59B0A"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.4.272","matchCriteriaId":"06199E67-91F5-4EC0-828B-22825E4DBAD1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.213","matchCriteriaId":"CE7B425A-A38B-494A-AA47-EC2251748164"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.152","matchCriteriaId":"DBBE9241-559E-479A-895A-02186BA03EBF"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.82","matchCriteriaId":"933AC628-7DAD-4B2D-82E3-3B7B331B1C09"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.22","matchCriteriaId":"AC6FD6F8-5B16-4F53-8116-D42F4BF4FBAC"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.7.10","matchCriteriaId":"FB4549F9-0160-455F-8CDC-98D38AEF6D66"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*","matchCriteriaId":"B9F4EA73-0894-400F-A490-3A397AB7A517"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*","matchCriteriaId":"056BD938-0A27-4569-B391-30578B309EE3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*","matchCriteriaId":"F02056A5-B362-4370-9FF8-6F0BD384D520"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:*","matchCriteriaId":"62075ACE-B2A0-4B16-829D-B3DA5AE5CC41"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:*","matchCriteriaId":"A780F817-2A77-4130-A9B7-5C25606314E3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:rc6:*:*:*:*:*:*","matchCriteriaId":"AEB9199B-AB8F-4877-8964-E2BA95B5F15C"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","matchCriteriaId":"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2024","CveId":"26851","Ordinal":"1","Title":"netfilter: nf_conntrack_h323: Add protection for bmp length out ","CVE":"CVE-2024-26851","Year":"2024"},"notes":[{"CveYear":"2024","CveId":"26851","Ordinal":"1","NoteData":"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<net/netfilter/nf_conntrack_h323_asn1.c:0>\nvmlinux   decode_seq(bs=0xFFFFFFD008037000, f=0xFFFFFFD008037018, level=134443100) + 1956\n<net/netfilter/nf_conntrack_h323_asn1.c:592>\nvmlinux   decode_choice(base=0xFFFFFFD0080370F0, level=23843636) + 1216\n<net/netfilter/nf_conntrack_h323_asn1.c:814>\nvmlinux   decode_seq(f=0xFFFFFFD0080371A8, level=134443500) + 812\n<net/netfilter/nf_conntrack_h323_asn1.c:576>\nvmlinux   decode_choice(base=0xFFFFFFD008037280, level=0) + 1216\n<net/netfilter/nf_conntrack_h323_asn1.c:814>\nvmlinux   DecodeRasMessage() + 304\n<net/netfilter/nf_conntrack_h323_asn1.c:833>\nvmlinux   ras_help() + 684\n<net/netfilter/nf_conntrack_h323_main.c:1728>\nvmlinux   nf_confirm() + 188\n<net/netfilter/nf_conntrack_proto.c:137>\n\nDue to abnormal data in skb->data, 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.","Type":"Description","Title":"netfilter: nf_conntrack_h323: Add protection for bmp length out "}]}}}