CVE-2024-26851

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.

• CWE-787

• https://git.kernel.org/stable/c/014a807f1cc9c9d5173c1cd935835553b00d211cPatch
• https://git.kernel.org/stable/c/39001e3c42000e7c2038717af0d33c32319ad591Patch
• https://git.kernel.org/stable/c/4bafcc43baf7bcf93566394dbd15726b5b456b7aPatch
• https://git.kernel.org/stable/c/767146637efc528b5e3d31297df115e85a2fd362Patch
• https://git.kernel.org/stable/c/80ee5054435a11c87c9a4f30f1ff750080c96416Patch
• https://git.kernel.org/stable/c/98db42191329c679f4ca52bec0b319689e1ad8cbPatch
• https://git.kernel.org/stable/c/b3c0f553820516ad4b62a9390ecd28d6f73a7b13Patch
• https://git.kernel.org/stable/c/ccd1108b16ab572d9bf635586b0925635dbd6bbcPatch
• https://git.kernel.org/stable/c/014a807f1cc9c9d5173c1cd935835553b00d211cPatch
• https://git.kernel.org/stable/c/39001e3c42000e7c2038717af0d33c32319ad591Patch
• https://git.kernel.org/stable/c/4bafcc43baf7bcf93566394dbd15726b5b456b7aPatch
• https://git.kernel.org/stable/c/767146637efc528b5e3d31297df115e85a2fd362Patch
• https://git.kernel.org/stable/c/80ee5054435a11c87c9a4f30f1ff750080c96416Patch
• https://git.kernel.org/stable/c/98db42191329c679f4ca52bec0b319689e1ad8cbPatch
• https://git.kernel.org/stable/c/b3c0f553820516ad4b62a9390ecd28d6f73a7b13Patch
• https://git.kernel.org/stable/c/ccd1108b16ab572d9bf635586b0925635dbd6bbcPatch
• https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
• https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List
• https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Published

Apr 17, 2024

Last Modified

Aug 4, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2024-26846In the Linux kernel, the following vulnerability has been re…4.4
• CVE-2024-26847In the Linux kernel, the following vulnerability has been re…5.1
• CVE-2024-26848Rejected reason: This CVE ID has been rejected or withdrawn …
• CVE-2024-26849In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2024-2685A vulnerability, which was classified as problematic, was fo…6.1
• CVE-2024-26850In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2024-26852In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2024-26853In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2024-26854In the Linux kernel, the following vulnerability has been re…7.5
• CVE-2024-26855In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2024-26856In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2024-26857In the Linux kernel, the following vulnerability has been re…7.3