In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.
History

Wed, 09 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Tue, 08 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 07 Sep 2026 08:45:00 +0000

Type Values Removed Values Added
First Time appeared Tcpdump
Tcpdump libpcap
Vendors & Products Tcpdump
Tcpdump libpcap

Sat, 05 Sep 2026 19:00:00 +0000

Type Values Removed Values Added
Description In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.
Title OOBR and OOBW in libpcap before 1.10.7
Weaknesses CWE-125
CWE-129
CWE-787
References
Metrics cvssV3_1

{'score': 8.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Tcpdump

Published: 2026-09-05T18:48:39.126Z

Updated: 2026-09-08T18:20:50.106Z

Reserved: 2026-01-08T23:19:31.855Z

Link: CVE-2026-0799

cve-icon Vulnrichment

Updated: 2026-09-08T18:20:39.994Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-05T19:16:55.320

Modified: 2026-09-08T19:20:25.117

Link: CVE-2026-0799

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-05T18:48:39Z

Links: CVE-2026-0799 - Bugzilla