CVE-2024-26851 (GCVE-0-2024-26851)
Vulnerability from cvelistv5
Published
2024-04-17 10:17
Modified
2026-08-05 11:27
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: Add protection for bmp length out of range UBSAN load reports an exception of BRK#5515 SHIFT_ISSUE:Bitwise shifts that are out of bounds for their data type. vmlinux get_bitmap(b=75) + 712 <net/netfilter/nf_conntrack_h323_asn1.c:0> vmlinux decode_seq(bs=0xFFFFFFD008037000, f=0xFFFFFFD008037018, level=134443100) + 1956 <net/netfilter/nf_conntrack_h323_asn1.c:592> vmlinux decode_choice(base=0xFFFFFFD0080370F0, level=23843636) + 1216 <net/netfilter/nf_conntrack_h323_asn1.c:814> vmlinux decode_seq(f=0xFFFFFFD0080371A8, level=134443500) + 812 <net/netfilter/nf_conntrack_h323_asn1.c:576> vmlinux decode_choice(base=0xFFFFFFD008037280, level=0) + 1216 <net/netfilter/nf_conntrack_h323_asn1.c:814> vmlinux DecodeRasMessage() + 304 <net/netfilter/nf_conntrack_h323_asn1.c:833> vmlinux ras_help() + 684 <net/netfilter/nf_conntrack_h323_main.c:1728> vmlinux nf_confirm() + 188 <net/netfilter/nf_conntrack_proto.c:137> Due to abnormal data in skb->data, the extension bitmap length exceeds 32 when decoding ras message then uses the length to make a shift operation. It will change into negative after several loop. UBSAN load could detect a negative shift as an undefined behaviour and reports exception. So we add the protection to avoid the length exceeding 32. Or else it will return out of range error and stop decoding.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
Version: 5e35941d990123f155b02d5663e51a24f816b6f3
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The attacker can be anywhere on the internet.\\nAC:L - The 7-bit extension-bitmap length field is read verbatim from the packet, so the attacker simply sets it above 32 to force the out-of-range shift \\u2014 deterministic, single packet, no timing or memory-layout dependency.\\nPR:N - The helper runs on the very first packet of the flow (the trace shows it invoked from nf_confirm()), before any application-level state, credentials, or connection setup exist. A completely unauthenticated remote host triggers it.\\nUI:N - Packet processing happens in softirq context on the conntrack hook with no involvement from any local user or administrator.\\nS:U - The undefined behavior and its consequences are confined to the kernel of the host running the conntrack helper; no VM, IOMMU, or sandbox boundary is crossed.\\nC:N - The out-of-range shift produces a garbage value in a local bitmap variable; the byte reads are still covered by nf_h323_error_boundary() and nothing is returned to the attacker, so there is no read primitive or information disclosure.\\nI:N - There is no out-of-bounds write and no corruption of adjacent state \\u2014 the extension loop remains bounded by f-\u003eub, so the effect is a misparse of the attacker\u0027s own message rather than modification of kernel data.\\nA:H - On kernels built with the UBSAN shift sanitizer in trap mode (widely deployed on Android/vendor kernels, and the exact configuration in the bug report) the out-of-range shift raises a BRK exception and panics the kernel, so one unauthenticated remote packet takes the box down.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\", \"lessThan\": \"98db42191329c679f4ca52bec0b319689e1ad8cb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\", \"lessThan\": \"4bafcc43baf7bcf93566394dbd15726b5b456b7a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\", \"lessThan\": \"ccd1108b16ab572d9bf635586b0925635dbd6bbc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\", \"lessThan\": \"b3c0f553820516ad4b62a9390ecd28d6f73a7b13\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\", \"lessThan\": \"39001e3c42000e7c2038717af0d33c32319ad591\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\", \"lessThan\": \"014a807f1cc9c9d5173c1cd935835553b00d211c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\", \"lessThan\": \"80ee5054435a11c87c9a4f30f1ff750080c96416\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e35941d990123f155b02d5663e51a24f816b6f3\", \"lessThan\": \"767146637efc528b5e3d31297df115e85a2fd362\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/nf_conntrack_h323_asn1.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.310\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.272\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.213\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.152\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.82\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.22\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nf_conntrack_h323_asn1.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.310\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.272\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.213\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.152\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.82\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.22\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.10\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"2.6.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:27:47.072Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26851\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:27:47.072Z\", \"dateReserved\": \"2024-02-19T14:20:24.183Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T10:17:15.298Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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