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CVE-2026-6554VulnerabilityPublished Updated

Libpcap BPF Interpreter Treats the Offset

Affects libpcapSource GCVE Database

0
Authoritative record:CVE-2026-6554· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 27 Oct 2026, 06:42 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10libpcappkg:deb/ubuntu/libpcap?arch=source&distro=stonkingOther threatsAffected
  • =1.10.6-1ubuntu1
  • =1.10.6-2ubuntu1
  • =1.10.7-1ubuntu1
Fixed in–
Ubuntu 26.04 LTSlibpcappkg:deb/ubuntu/libpcap?arch=source&distro=resoluteOther threatsAffected
  • 1.10.5-2ubuntu2 – 1.10.6-1ubuntu1.1
4 affected builds
Fixed in–
Ubuntu 24.04 LTSlibpcappkg:deb/ubuntu/libpcap?arch=source&distro=nobleOther threatsAffected
  • 1.10.4-4 – 1.10.4-4ubuntu3
5 affected builds
Fixed in–
Ubuntu 22.04 LTSlibpcappkg:deb/ubuntu/libpcap?arch=source&distro=jammyOther threatsAffected
  • 1.10.0-2build1 – 1.10.1-4ubuntu1.22.04.2
5 affected builds
Fixed in–
Ubuntu Pro 20.04 LTSlibpcappkg:deb/ubuntu/libpcap?arch=source&distro=esm-infra/focalOther threatsAffected
  • 1.9.1-2 – 1.9.1-3ubuntu1.20.04.1+esm1
4 affected builds
Fixed in–
Ubuntu Pro 18.04 LTSlibpcappkg:deb/ubuntu/libpcap?arch=source&distro=esm-infra/bionicOther threatsAffected
  • 1.8.1-5ubuntu1 – 1.8.1-6ubuntu1.18.04.2+esm1
5 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

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.

References

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