CVE-2026-6554

infinte loop in libpcap before 1.10.7

CVE-2026-6554 is fixed in 4 products on 1 platform, first by FEDORA-2026-4401B94AD0, released September 10, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0044

38th percentile

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. A crafted filter program or the 'protochain' primitive used on a crafted network packet can cause the interpreter to loop infinitely.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
libpcap · Debian 14	1.10.7-1	DEBIAN-CVE-2026-6554	Sep 14, 2026
libpcap · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap · amzn 2023	14:1.10.7-1.amzn2023.0.1	ALAS2023-2026-3100	Sep 28, 2026
libpcap · opensuse-leap 16.0	1.10.5-160000.5.1	OPENSUSE-SU-2026:21940-1	Sep 23, 2026
libpcap · sles 15.6	1.10.4-150600.3.12.1	SUSE-SU-2026:4194-1	Sep 15, 2026
libpcap · sles 15.7	1.10.5-150700.3.13.1	SUSE-SU-2026:4188-1	Sep 15, 2026
libpcap · sles 16.0	1.10.5-160000.5.1	SUSE-SU-2026:23907-1	Sep 23, 2026
libpcap-debuginfo · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap-debuginfo · amzn 2023	14:1.10.7-1.amzn2023.0.1	ALAS2023-2026-3100	Sep 28, 2026
libpcap-debugsource · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap-debugsource · amzn 2023	14:1.10.7-1.amzn2023.0.1	ALAS2023-2026-3100	Sep 28, 2026
libpcap-devel · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap-devel · amzn 2023	14:1.10.7-1.amzn2023.0.1	ALAS2023-2026-3100	Sep 28, 2026

Details

Published
September 5, 2026
Weakness
Loop with Unreachable Exit Condition ('Infinite Loop')
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6554

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/cve/CVE-2026-6554">CVE-2026-6554 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Is this on your machines?

Patchblox finds every install below the fixed version on Windows, macOS and Linux, and updates them through your release rings.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.