Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 4.13.4 |
Related Weaknesses (CWE)
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1fa07PatchVendor Advisory
- http://openwall.com/lists/oss-security/2018/03/27/4Mailing ListThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1318
- https://access.redhat.com/security/cve/cve-2018-1091Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1558149Issue TrackingThird Party Advisory
- https://github.com/torvalds/linux/commit/c1fa0768a8713b135848f78fd43ffc208d8ded7PatchThird Party Advisory
- https://marc.info/?l=linuxppc-embedded&m=150535531910494&w=2PatchThird Party Advisory
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5PatchVendor Advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1fa07PatchVendor Advisory
- http://openwall.com/lists/oss-security/2018/03/27/4Mailing ListThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:1318
- https://access.redhat.com/security/cve/cve-2018-1091Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1558149Issue TrackingThird Party Advisory
- https://github.com/torvalds/linux/commit/c1fa0768a8713b135848f78fd43ffc208d8ded7PatchThird Party Advisory
- https://marc.info/?l=linuxppc-embedded&m=150535531910494&w=2PatchThird Party Advisory
FAQ
What is CVE-2018-1091?
CVE-2018-1091 is a vulnerability with a CVSS score of 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 POWE...
How severe is CVE-2018-1091?
CVE-2018-1091 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-1091?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.