Vulnerability Description
A flaw was found in Linux kernel's KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host's userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu variables. An attacker can use this to escalate their privileges.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 2.6.36 |
| Redhat | Enterprise Linux Desktop | 6.0 |
| Redhat | Enterprise Linux Server | 6.0 |
| Redhat | Enterprise Linux Server Aus | 6.4 |
| Redhat | Enterprise Linux Workstation | 6.0 |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/104905Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:2390Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2391Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2392Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2393Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2394Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10901Issue TrackingPatchThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=34PatchVendor Advisory
- https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxurThird Party Advisory
- https://www.oracle.com/security-alerts/cpujul2020.htmlThird Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatchThird Party Advisory
- http://www.securityfocus.com/bid/104905Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:2390Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2391Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2392Third Party Advisory
FAQ
What is CVE-2018-10901?
CVE-2018-10901 is a vulnerability with a CVSS score of 7.8 (HIGH). A flaw was found in Linux kernel's KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host'...
How severe is CVE-2018-10901?
CVE-2018-10901 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-10901?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Workstation.