CVE-2026-6244
Description
A flaw was found in libpcap. The Berkeley Packet Filter (BPF) interpreter's 'div #k' and 'mod #k' instructions do not validate if the immediate value 'k' is zero. A local attacker with low privileges could exploit this by providing a specially crafted filter program, leading to a division-by-zero error. This could result in a denial of service (DoS) for the affected system.
Statement
This Moderate flaw in libpcap's BPF interpreter allows a local attacker with low privileges to trigger a denial of service. The vulnerability arises from insufficient validation of immediate values in 'div #k' and 'mod #k' ALU instructions, which can lead to a division-by-zero error when processing a specially crafted filter program. This impact is limited to local denial of service due to the required local access and low privileges.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | 5.5 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart
A Divide by Zero results in a crash.
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