CVE-2018-0495: Canonical Ubuntu Linux

Medium severity, CVSS 4.7. EPSS: 0.9% chance of exploitation in the next 30 days.

Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only; version 17.10 only; version 18.04 only; version 18.10 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Gnupg Libgcrypt: before 1.7.10 (fixed in 1.7.10); from 1.8.0, before 1.8.3 (fixed in 1.8.3)
• Oracle Traffic Director: version 11.1.1.9.0 only
• Red Hat Ansible Tower: version 3.3 only
• 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 2018-06-13. Last modified 2026-06-17.