CVE-2019-18660

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-11-27 · updated 2026-06-17
Weakness: CWE-200

Description

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: 14.04, 16.04, 18.04, 19.04, 19.10
Fedoraproject Fedora: 30, 31
Linux kernel: before 5.4.1 — fixed in 5.4.1
openSUSE Leap: 15.1
Red Hat Enterprise Linux: 6.0, 7.0, 8.0

How to fix

Upgrade to a fixed version: Linux kernel 5.4.1. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00029.html
http://packetstormsecurity.com/files/155890/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
http://www.openwall.com/lists/oss-security/2019/11/27/1
https://access.redhat.com/errata/RHSA-2020:0174
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=39e72bf96f5847ba87cc5bd7a3ce0fed813dc9ad
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYIFGYEDQXP5DVJQQUARQRK2PXKBKQGY/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YWWOOJKZ4NQYN4RMFIVJ3ZIXKJJI3MKP/
https://seclists.org/bugtraq/2020/Jan/10
https://security.netapp.com/advisory/ntap-20200103-0001/
https://usn.ubuntu.com/4225-1/
https://usn.ubuntu.com/4225-2/

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