5.5

CVE-2026-6244: the tcpdump group libpcap Divide By Zero

CVSS: 5.5v3.1MediumAwaiting analysis
AliasesALPINE-CVE-2026-6244UBUNTU-CVE-2026-6244DEBIAN-CVE-2026-6244
Published 05-09-2026Last modified 17-09-2026
Open JSON

Vulnerability summary

CVE-2026-6244 is a medium (CVSS 5.5) Divide By Zero vulnerability in the tcpdump group libpcap. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 3.6% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.15%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 10
MGASA-2026-0416OPENSUSE-SU-2026:11744-1OPENSUSE-SU-2026:21940-1SUSE-SU-2026:23737-1SUSE-SU-2026:23829-1SUSE-SU-2026:23892-1

Timeline

  1. 05-09-2026
    PublishedVulnerability first disclosed.
  2. 17-09-2026
    Last modifiedVulnerability information updated.

Description

libpcap BPF interpreter for the 'div #k' and 'mod #k' ALU instructions does not check whether the immediate value is zero. In particular uncommon use cases a crafted filter program can cause a division by zero.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

+0.05 pp

From 0.10% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Alpine1 product
  • libpcap< 1.10.7-r0
Debian1 product
  • libpcapAll versions (No fix recorded) | < 1.10.7-1
The tcpdump group1 product
Ubuntu1 product
  • libpcapAll versions (No fix recorded)

4 vendors · 4 products

References

6 links