CVE-2024-26851netfilter: nf_conntrack_h323: Add protection for bmp length out of range
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 5e35941d990123f155b02d5663e51a24f816b6f3 before 98db42191329c679f4ca52bec0b319689e1ad8cb; 5e35941d990123f155b02d5663e51a24f816b6f3 builds before 4bafcc43baf7bcf93566394dbd15726b5b456b7a; from 5e35941d990123f155b02d5663e51a24f816b6f3 before ccd1108b16ab572d9bf635586b0925635dbd6bbc; from 5e35941d990123f155b02d5663e51a24f816b6f3 before b3c0f553820516ad4b62a9390ecd28d6f73a7b13; from 5e35941d990123f155b02d5663e51a24f816b6f3 before 39001e3c42000e7c2038717af0d33c32319ad591; from 5e35941d990123f155b02d5663e51a24f816b6f3 before 014a807f1cc9c9d5173c1cd935835553b00d211c; from 5e35941d990123f155b02d5663e51a24f816b6f3 before 80ee5054435a11c87c9a4f30f1ff750080c96416; from 5e35941d990123f155b02d5663e51a24f816b6f3 before 767146637efc528b5e3d31297df115e85a2fd362 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.17 before 4.19.310; from 4.20 before 5.4.272; from 5.5 before 5.10.213; from 5.11 before 5.15.152; from 5.16 before 6.1.82; from 6.2 before 6.6.22; from 6.7 before 6.7.10; 6.8; and 5 more ranges | NVD |
debian debian_linux debian:debian_linux | 10.0 | NVD |
References
- https://git.kernel.org/stable/c/98db42191329c679f4ca52bec0b319689e1ad8cbpatch
- https://git.kernel.org/stable/c/4bafcc43baf7bcf93566394dbd15726b5b456b7apatch
- https://git.kernel.org/stable/c/ccd1108b16ab572d9bf635586b0925635dbd6bbcpatch
- https://git.kernel.org/stable/c/b3c0f553820516ad4b62a9390ecd28d6f73a7b13patch
- https://git.kernel.org/stable/c/39001e3c42000e7c2038717af0d33c32319ad591patch
- https://git.kernel.org/stable/c/014a807f1cc9c9d5173c1cd935835553b00d211cpatch
- https://git.kernel.org/stable/c/80ee5054435a11c87c9a4f30f1ff750080c96416patch
- https://git.kernel.org/stable/c/767146637efc528b5e3d31297df115e85a2fd362patch
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.