{"id":"DEBIAN-CVE-2024-26851","details":"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 \u003cnet/netfilter/nf_conntrack_h323_asn1.c:0\u003e vmlinux   decode_seq(bs=0xFFFFFFD008037000, f=0xFFFFFFD008037018, level=134443100) + 1956 \u003cnet/netfilter/nf_conntrack_h323_asn1.c:592\u003e vmlinux   decode_choice(base=0xFFFFFFD0080370F0, level=23843636) + 1216 \u003cnet/netfilter/nf_conntrack_h323_asn1.c:814\u003e vmlinux   decode_seq(f=0xFFFFFFD0080371A8, level=134443500) + 812 \u003cnet/netfilter/nf_conntrack_h323_asn1.c:576\u003e vmlinux   decode_choice(base=0xFFFFFFD008037280, level=0) + 1216 \u003cnet/netfilter/nf_conntrack_h323_asn1.c:814\u003e vmlinux   DecodeRasMessage() + 304 \u003cnet/netfilter/nf_conntrack_h323_asn1.c:833\u003e vmlinux   ras_help() + 684 \u003cnet/netfilter/nf_conntrack_h323_main.c:1728\u003e vmlinux   nf_confirm() + 188 \u003cnet/netfilter/nf_conntrack_proto.c:137\u003e  Due to abnormal data in skb-\u003edata, 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.","modified":"2026-09-15T09:03:05.642580395Z","published":"2024-04-17T11:15:08.473Z","upstream":["CVE-2024-26851"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-26851"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.82-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26851.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.7.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26851.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.7.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26851.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}