CVE-2019-18660: Canonical Ubuntu Linux

Medium severity, CVSS 4.7. EPSS: 0.7% chance of exploitation in the next 30 days.

The Linux kernel before 5.4.1 on powerpc allows Information Exposure because the Spectre-RSB mitigation is not in place for all applicable CPUs, aka CID-39e72bf96f58. This is related to arch/powerpc/kernel/entry_64.S and arch/powerpc/kernel/security.c.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 19.04 only; version 19.10 only
• Fedoraproject Fedora: version 30 only; version 31 only
• Linux Linux Kernel: before 5.4.1 (fixed in 5.4.1)
• Opensuse Leap: version 15.1 only
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only

Published 2019-11-27. Last modified 2026-06-17.