CVE-2018-1091

low-risk
Published 2018-03-27

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.

Do I need to act?

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0.08% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Linux

References (16)

Patch http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1fa07...
Mailing List http://openwall.com/lists/oss-security/2018/03/27/4
https://access.redhat.com/errata/RHSA-2018:1318
Third Party Advisory https://access.redhat.com/security/cve/cve-2018-1091
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1558149
Patch https://github.com/torvalds/linux/commit/c1fa0768a8713b135848f78fd43ffc208d8ded7...
Patch https://marc.info/?l=linuxppc-embedded&m=150535531910494&w=2
Patch https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5
Patch http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1fa07...
Mailing List http://openwall.com/lists/oss-security/2018/03/27/4
https://access.redhat.com/errata/RHSA-2018:1318
Third Party Advisory https://access.redhat.com/security/cve/cve-2018-1091
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1558149
Patch https://github.com/torvalds/linux/commit/c1fa0768a8713b135848f78fd43ffc208d8ded7...
Patch https://marc.info/?l=linuxppc-embedded&m=150535531910494&w=2
Patch https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5
23
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal