netfilter: nf_conntrack_h323: Add protection for bmp length out of range

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Summary

CVECVE-2024-26851
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-04-17 11:15:08 UTC
Updated2026-05-12 12:16:20 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-787

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5e35941d990123f155b02d5663e51a24f816b6f3 98db42191329c679f4ca52bec0b319689e1ad8cb git Not specified
CNA Linux Linux affected 5e35941d990123f155b02d5663e51a24f816b6f3 4bafcc43baf7bcf93566394dbd15726b5b456b7a git Not specified
CNA Linux Linux affected 5e35941d990123f155b02d5663e51a24f816b6f3 ccd1108b16ab572d9bf635586b0925635dbd6bbc git Not specified
CNA Linux Linux affected 5e35941d990123f155b02d5663e51a24f816b6f3 b3c0f553820516ad4b62a9390ecd28d6f73a7b13 git Not specified
CNA Linux Linux affected 5e35941d990123f155b02d5663e51a24f816b6f3 39001e3c42000e7c2038717af0d33c32319ad591 git Not specified
CNA Linux Linux affected 5e35941d990123f155b02d5663e51a24f816b6f3 014a807f1cc9c9d5173c1cd935835553b00d211c git Not specified
CNA Linux Linux affected 5e35941d990123f155b02d5663e51a24f816b6f3 80ee5054435a11c87c9a4f30f1ff750080c96416 git Not specified
CNA Linux Linux affected 5e35941d990123f155b02d5663e51a24f816b6f3 767146637efc528b5e3d31297df115e85a2fd362 git Not specified
CNA Linux Linux affected 2.6.17 Not specified
CNA Linux Linux unaffected 2.6.17 semver Not specified
CNA Linux Linux unaffected 4.19.310 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.272 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.213 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.152 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.82 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.22 6.6.* semver Not specified
CNA Linux Linux unaffected 6.7.10 6.7.* semver Not specified
CNA Linux Linux unaffected 6.8 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/80ee5054435a11c87c9a4f30f1ff750080c96416 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List
git.kernel.org/stable/c/39001e3c42000e7c2038717af0d33c32319ad591 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/014a807f1cc9c9d5173c1cd935835553b00d211c af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/767146637efc528b5e3d31297df115e85a2fd362 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/b3c0f553820516ad4b62a9390ecd28d6f73a7b13 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/4bafcc43baf7bcf93566394dbd15726b5b456b7a af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/98db42191329c679f4ca52bec0b319689e1ad8cb af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00020.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List
git.kernel.org/stable/c/ccd1108b16ab572d9bf635586b0925635dbd6bbc af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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