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CVE-2018-1091

5.5 · MEDIUM

In the flush_tmregs_to_thread function in arch/powerpc/kernel/ptrace.c in the Linux kernel before 4.13.5, a guest kernel crash can be triggered from unprivileged userspace during a core dump on a P…

Published Mar 27, 2018CWE-391EPSS 0.40%

Overview

CVE-2018-1091 is a medium-severity vulnerability. It was published on March 27, 2018 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the flush_tmregs_to_thread function in arch/powerpc/kernel/ptrace.c in the Linux kernel before 4.13.5, a guest kernel crash can be triggered from unprivileged userspace during a core dump on a POWER host due to a missing processor feature check and an erroneous use of transactional memory (TM) instructions in the core dump path, leading to a denial of service.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1fa0768a8713b135848f78fd43ffc208d8ded70Refopenwall.com/lists/oss-security/2018/03/27/4Refaccess.redhat.com/errata/RHSA-2018:1318Refaccess.redhat.com/security/cve/cve-2018-1091Refbugzilla.redhat.com/show_bug.cgi?id=1558149GitHubgithub.com/torvalds/linux/commit/c1fa0768a8713b135848f78fd43ffc208d8ded70Refmarc.info/?l=linuxppc-embedded&m=150535531910494&w=2Refwww.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1fa0768a8713b135848f78fd43ffc208d8ded70Refopenwall.com/lists/oss-security/2018/03/27/4

How CyberStrike helps

Frequently asked questions

What is CVE-2018-1091?

CVE-2018-1091 is a medium-severity vulnerability. It was published on March 27, 2018 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

How severe is CVE-2018-1091?

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2018-1091?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-1091?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-1091 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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