Description
libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. In particular uncommon use cases a crafted filter program can cause the interpreter to loop infinitely.
Published: 2026-09-05
Score: 5.5 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

Upgrade to libpcap 1.10.7.

Tracking

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Advisories

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History

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

Type Values Removed Values Added
Description libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. In particular uncommon use cases a crafted filter program can cause the interpreter to loop infinitely.
Title infinte loop in libpcap before 1.10.7
Weaknesses CWE-835
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: Tcpdump

Published:

Updated: 2026-09-05T18:51:02.338Z

Reserved: 2026-04-17T22:00:24.313Z

Link: CVE-2026-6554

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-05T19:16:56.067

Modified: 2026-09-05T19:16:56.067

Link: CVE-2026-6554

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-05T20:30:17Z

Weaknesses
  • CWE-835

    Loop with Unreachable Exit Condition ('Infinite Loop')