Out-of-bounds Read in Qemu
CVE-2018-7858
Quick Emulator (aka QEMU), when built with the Cirrus CLGD 54xx VGA Emulator support, allows local guest OS privileged users to cause a denial of service (out-of-bounds access and QEMU process crash) by leveraging incorrect region calculation when updating VGA display.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Qemu
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
- openSUSE Leap — versions 42.3
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Server — versions 6.0, 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.6
- Red Hat Enterprise Linux Server Eus — versions 7.5, 7.6
- Red Hat Enterprise Linux Server Tus — versions 7.6
- Red Hat Enterprise Linux Workstation — versions 6.0, 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/errata/RHSA-2018:2162 (vendor-advisory, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- access.redhat.com/errata/RHSA-2018:1369 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3649-1/ (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:1416 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/103350 (VDB Entry, Third Party Advisory, vdb-entry)
- www.openwall.com/lists/oss-security/2018/03/09/1 (mailing-list, Patch, Mailing List, Third Party Advisory)
- lists.nongnu.org/archive/html/qemu-devel/2018-03/msg02174.html (Vendor Advisory, mailing-list, Patch, Mailing List)
- lists.opensuse.org/opensuse-security-announce/2019-03/msg00042.html (vendor-advisory, Mailing List, Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2018-7858?
- CVE-2018-7858 is a medium-severity vulnerability in Qemu, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2018-03-12.
- How severe is CVE-2018-7858?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2018-7858 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.