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Fencer Intel
high 7.5

CVE-2026-6554 json

infinte loop in libpcap before 1.10.7

published 2mo ago modified 20d 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

Is CVE-2026-6554 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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 Enterprise Linux BaseOS EUS (v.10.2) libpcap 1.10.4-7.el10_2.2 Red Hat Enterprise Linux CodeReady Linux Builder EUS (v.10.2) libpcap-devel 1.10.4-7.el10_2.2, libpcap-debuginfo 1.10.4-7.el10_2.2, libpcap-debugsource 1.10.4-7.el10_2.2
    fixed: vendor fix RHSA-2026:99163

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
2mo ago

Exploit prediction

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

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 Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.