CVE-2018-10845: Canonical Ubuntu Linux

Medium severity, CVSS 5.9. EPSS: 3.6% chance of exploitation in the next 30 days.

It was found that the GnuTLS implementation of HMAC-SHA-384 was vulnerable to a Lucky thirteen style attack. Remote attackers could use this flaw to conduct distinguishing attacks and plain text recovery attacks via statistical analysis of timing data using crafted packets.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 18.10 only; version 19.04 only
• Debian Debian Linux: version 8.0 only
• Fedoraproject Fedora: version 31 only; version 32 only
• GNU Gnutls: before 3.6.12 (fixed in 3.6.12)
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Workstation: version 7.0 only

Published 2018-08-22. Last modified 2026-06-17.