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Fencer Vulns
high 7.5

CVE-2026-6554 json

infinte loop in libpcap before 1.10.7

published 2026-09-05 2 mo ago modified 2026-10-22 17 d ago also EUVD-2026-72019

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

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.

Patch / fix

  • The Tcpdump Group libpcap 1.10.7
  • libpcap Debian 14 1.10.7-1

debian advisories DEBIAN-CVE-2026-6554

  • libpcap SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.10.5-160000.5.1
  • libpcap SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 1.10.1-150400.3.12.1
  • libpcap SLE Module for Package Hub 15 SP7, SLE Module for Basesystem 15 SP7 1.10.5-150700.3.13.1
  • libpcap Linux Micro 6.1 1.10.4-slfo.1.1_3.1
  • libpcap Linux Micro 6.0 1.10.4-5.1
  • libpcap SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.8.1-10.12.1
  • libpcap SLES for SAP 15 SP6, SLES 15 SP6-LTSS 1.10.4-150600.3.12.1

suse advisories SUSE-SU-2026:23892-1SUSE-SU-2026:23907-1SUSE-SU-2026:4239-1SUSE-SU-2026:4195-1SUSE-SU-2026:4194-1SUSE-SU-2026:4188-1

  • libpcap openSUSE Leap 16.0 1.10.5-160000.5.1
  • libpcap openSUSE Tumbleweed 1.10.7-1.1

opensuse advisories openSUSE-SU-2026:21940-1openSUSE-SU-2026:11744-1

  • libpcap Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 1.10.7-r0

alpine advisories ALPINE-CVE-2026-6554

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libpcap Azure Linux 3.0 1.10.7-1

azure linux advisories AZL-99747

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-6554 updated cvss 7.5

libpcap: libpcap: Denial of Service via infinite loop in BPF interpreter

  • Red Hat Enterprise Linux 6 libpcap Red Hat Enterprise Linux 7 libpcap Red Hat Enterprise Linux 8 libpcap Red Hat Enterprise Linux 9 libpcap Red Hat Enterprise Linux 10 libpcap Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • The Tcpdump Group libpcap

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.