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Vulnerabilities / CVE-2018-6836

critical

CVE-2018-6836

wireshark: free operation on an uninitialized memory address in wiretap/netmon.c

Published Modified CWE 763
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat3.3CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Ubuntu (medium), Red Hat (low).

Description

The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a free operation on an uninitialized memory address, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact.

Affected packages and fixed versions

SourcePackageFixed in
Red Hatwireshark, wireshark-cli, wireshark-devel and 1 moreno fix listed
ubuntu 14.04wireshark2.6.3-1~ubuntu14.04.1
ubuntu 14.04-ESMwireshark2.6.3-1~ubuntu14.04.1
ubuntu 16.04wireshark2.6.3-1~ubuntu16.04.1
ubuntu 16.04-ESMwireshark2.6.3-1~ubuntu16.04.1
ubuntu 18.04wireshark2.6.3-1~ubuntu18.04.1
ubuntu 18.04-ESMwireshark2.6.3-1~ubuntu18.04.1
Show all 10 entries from 7 sources
SourcePackageFixed in
Red Hatwiresharkno fix listed
Red Hatwireshark-clino fix listed
Red Hatwireshark-develno fix listed
Red Hatwireshark-gnomeno fix listed
ubuntu 14.04wireshark2.6.3-1~ubuntu14.04.1
ubuntu 14.04-ESMwireshark2.6.3-1~ubuntu14.04.1
ubuntu 16.04wireshark2.6.3-1~ubuntu16.04.1
ubuntu 16.04-ESMwireshark2.6.3-1~ubuntu16.04.1
ubuntu 18.04wireshark2.6.3-1~ubuntu18.04.1
ubuntu 18.04-ESMwireshark2.6.3-1~ubuntu18.04.1

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.