medium
5.6
CWE
200
Advisory Published
Updated

CVE-2019-18660: Infoleak

First published: Wed Nov 27 2019(Updated: )

A flaw was found in the way the Linux kernel implemented a software flush of the Count Cache (indirect branch cache) and Link (Return Address) Stack on the PowerPC platform. The flushing of these structures helps to prevent SpectreRSB like attacks which may leak information from one user process to another. An unprivileged user could use this flaw to cross the syscall or process boundary and read privileged memory by conducting targeted cache side-channel attacks.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/kernel<0:2.6.32-754.31.1.el6
0:2.6.32-754.31.1.el6
redhat/kernel-alt<0:4.14.0-115.17.1.el7a
0:4.14.0-115.17.1.el7a
redhat/kernel<0:3.10.0-1127.el7
0:3.10.0-1127.el7
redhat/kernel<0:3.10.0-957.56.1.el7
0:3.10.0-957.56.1.el7
redhat/kernel<0:3.10.0-1062.21.1.el7
0:3.10.0-1062.21.1.el7
redhat/kernel<0:4.18.0-147.8.1.el8_1
0:4.18.0-147.8.1.el8_1
redhat/kernel<0:4.18.0-80.23.2.el8_0
0:4.18.0-80.23.2.el8_0
IBM Data Risk Manager<=2.0.6
Linux Kernel<5.4.1
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=19.04
Ubuntu=19.10
Fedora=30
Fedora=31
SUSE Linux=15.1
Red Hat Enterprise Linux=6.0
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
debian/linux
5.10.223-1
5.10.234-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.17-1

Remedy

http://www.openwall.com/lists/oss-security/2019/11/27/1

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=39e72bf96f5847ba87cc5bd7a3ce0fed813dc9ad

Remedy

https://www.openwall.com/lists/oss-security/2019/11/27/1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2019-18660?

    CVE-2019-18660 is rated as a medium-severity vulnerability in the Linux kernel impacting the PowerPC platform.

  • How do I fix CVE-2019-18660?

    To fix CVE-2019-18660, update your Linux kernel to the appropriate remedial version for your distribution.

  • Which systems are affected by CVE-2019-18660?

    CVE-2019-18660 affects various versions of the Linux kernel, including certain Red Hat, Ubuntu, Fedora, and openSUSE systems.

  • What type of vulnerability is CVE-2019-18660?

    CVE-2019-18660 is a flaw related to insufficient flushing of the Count Cache and Link Stack, potentially leading to information leaks.

  • Can I still use my system if it is affected by CVE-2019-18660?

    While you can still use your system, it is strongly recommended to apply the necessary patches to mitigate the risk of exploitation.

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