CVE-2018-7858: canonical ubuntu_linux Out-of-bounds Read
Vulnerability summary
CVE-2018-7858 is a medium (CVSS 5.5) Out-of-bounds Read vulnerability in canonical ubuntu_linux. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 49.2% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 10 · Related 4Timeline
- 12-03-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.61%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.61% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat11 products
- enterprise_linux_desktop6.0 | 7.0
- enterprise_linux_server6.0 | 7.0
- enterprise_linux_server_aus7.6
- enterprise_linux_server_eus7.5 | 7.6
- enterprise_linux_server_tus7.6
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10
Debian1 product
- qemu< 1:2.12~rc3+dfsg-1
Opensuse1 product
- leapEOL42.3
Qemu1 product
- qemu≤ 2.11.2
Ubuntu1 product
- qemu< 1:2.11+dfsg-1ubuntu7.1
6 vendors · 16 products
References
17 links- bugzilla.redhat.com/show_bug.cgi?id=1553402X Refsource CONFIRMIssue TrackingThird Party AdvisoryREPORT
- access.redhat.com/errata/RHSA-2018:1416Vendor AdvisoryX Refsource REDHATThird Party AdvisoryAdvisory
- www.openwall.com/lists/oss-security/2018/03/09/1Mailing ListX Refsource MLISTPatchThird Party Advisory
- lists.nongnu.org/archive/html/qemu-devel/2018-03/msg02174.htmlMailing ListX Refsource MLISTPatchVendor AdvisoryREPORT
- lists.opensuse.org/opensuse-security-announce/2019-03/msg00042.htmlVendor AdvisoryX Refsource SUSEMailing ListRelease NotesThird Party Advisory
