CVE-2024-26851

Advisory lineage Upstream: 0 Downstream: 38
Modified
Published: 17 Apr 2024, 10:17
Last modified:12 May 2026, 11:49

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
<0.01% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

17 Apr 2024, 10:17
Published
Vulnerability first disclosed
12 May 2026, 11:49
Last Modified
Vulnerability information updated

Description

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 Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 1%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • debian•debian_linux

    10.0

  • linux•linux

    ≥ 5e35941d990123f155b02d5663e51a24f816b6f3, < 98db42191329c679f4ca52bec0b319689e1ad8cb | ≥ 5e35941d990123f155b02d5663e51a24f816b6f3, < 4bafcc43baf7bcf93566394dbd15726b5b456b7a | ≥ 5e35941d990123f155b02d5663e51a24f816b6f3, < ccd1108b16ab572d9bf635586b0925635dbd6bbc | ≥ 5e35941d990123f155b02d5663e51a24f816b6f3, < b3c0f553820516ad4b62a9390ecd28d6f73a7b13 | ≥ 5e35941d990123f155b02d5663e51a24f816b6f3, < 39001e3c42000e7c2038717af0d33c32319ad591 | ≥ 5e35941d990123f155b02d5663e51a24f816b6f3, < 014a807f1cc9c9d5173c1cd935835553b00d211c | ≥ 5e35941d990123f155b02d5663e51a24f816b6f3, < 80ee5054435a11c87c9a4f30f1ff750080c96416 | ≥ 5e35941d990123f155b02d5663e51a24f816b6f3, < 767146637efc528b5e3d31297df115e85a2fd362 | 2.6.17

  • linux•linux_kernel

    ≥ 2.6.17, < 4.19.310 | ≥ 4.20, < 5.4.272 | ≥ 5.5, < 5.10.213 | ≥ 5.11, < 5.15.152 | ≥ 5.16, < 6.1.82 | ≥ 6.2, < 6.6.22 | ≥ 6.7, < 6.7.10 | 6.8:rc1 | 6.8:rc2 | 6.8:rc3 | 6.8:rc4 | 6.8:rc5 | 6.8:rc6

References (11)