Privilege escalation in Linux Kernel
CVE-2018-10853
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.0 (High). Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (38.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Linux Kernel — versions 4.18
- Linux Kernel
- Canonical Ubuntu Linux — versions 16.04, 18.04
- Debian Linux — versions 8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.debian.org/debian-lts-announce/2018/07/msg00015.html (mailing-list, Mailing List, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- usn.ubuntu.com/3777-1/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2018/07/msg00016.html (mailing-list, Mailing List, Third Party Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- lists.debian.org/debian-lts-announce/2018/07/msg00020.html (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/3777-2/ (vendor-advisory, Third Party Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- www.openwall.com/lists/oss-security/2018/09/02/1 (Patch, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-05/msg00043.html (vendor-advisory)
Frequently asked questions
- What is CVE-2018-10853?
- CVE-2018-10853 is a high-severity vulnerability in Linux Kernel, classified under CWE-250. CVSS score: 7.0/10. Published 2018-09-11.
- How severe is CVE-2018-10853?
- High severity. CVSS v3 base score is 7.0 out of 10.
- Is CVE-2018-10853 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.