---
id: CVE-2026-0799
title: >-
  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
summary: >-
  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 c…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H'
cwe:
  - CWE-125
  - CWE-129
  - CWE-787
vendor: The Tcpdump Group
product: libpcap
affected:
  - libpcap < 1.10.7
published: '2026-09-05'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:20:25.117'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-0799'
references:
  - url: >-
      https://github.com/the-tcpdump-group/libpcap/commit/48e8960a7108e9e828f9d7bdc7e97bdab841aec7
    label: security@tcpdump.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0799.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-0799'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2529093'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-0799'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-0799'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T18:20:35.280967Z'
epss: 0.00108
epssPercentile: 0.01086
ingestedAt: '2026-09-06T10:53:51.988Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0799.json)