Vulnerability Description
A flaw was found in the way Linux kernel KVM hypervisor before 4.18 emulated instructions such as sgdt/sidt/fxsave/fxrstor. It did not check current privilege(CPL) level while emulating unprivileged instructions. An unprivileged guest user/process could use this flaw to potentially escalate privileges inside guest.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Ubuntu Linux | 16.04 |
| Debian | Debian Linux | 8.0 |
| Linux | Linux Kernel | < 4.18 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00043.html
- https://access.redhat.com/errata/RHSA-2019:2029
- https://access.redhat.com/errata/RHSA-2019:2043
- https://access.redhat.com/errata/RHSA-2020:0036
- https://access.redhat.com/errata/RHSA-2020:0103
- https://access.redhat.com/errata/RHSA-2020:0179
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10853Issue TrackingPatchThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=12PatchVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3cPatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/07/msg00015.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/07/msg00016.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/07/msg00020.htmlMailing ListThird Party Advisory
- https://usn.ubuntu.com/3777-1/Third Party Advisory
- https://usn.ubuntu.com/3777-2/Third Party Advisory
- https://www.openwall.com/lists/oss-security/2018/09/02/1Mailing ListPatchThird Party Advisory
FAQ
What is CVE-2018-10853?
CVE-2018-10853 is a vulnerability with a CVSS score of 7.0 (HIGH). A flaw was found in the way Linux kernel KVM hypervisor before 4.18 emulated instructions such as sgdt/sidt/fxsave/fxrstor. It did not check current privilege(CPL) level while emulating unprivileged i...
How severe is CVE-2018-10853?
CVE-2018-10853 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-10853?
Check the references section above for vendor advisories and patch information. Affected products include: Canonical Ubuntu Linux, Debian Debian Linux, Linux Linux Kernel.