CVE-2016-2391: canonical ubuntu_linux NULL Pointer Dereference
Vulnerability summary
CVE-2016-2391 is a medium (CVSS 5.0) NULL Pointer Dereference vulnerability in canonical ubuntu_linux. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 33.9% of scored vulnerabilities.
Not severe (CVSS 5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 12 · Related 10Timeline
- 16-06-2016PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
The ohci_bus_start function in the USB OHCI emulation support (hw/usb/hcd-ohci.c) in QEMU allows local guest OS administrators to cause a denial of service (NULL pointer dereference and QEMU process crash) via vectors related to multiple eof_timers.
CVSS metrics
5 scores · 3 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated5.0MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.0MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.40%
Chance of exploitation in the next 30 days
Percentile
34%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.40% 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, user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- qemu< 1:2.6+dfsg-1
- debian_linuxEOL8.0
Canonical1 product
- ubuntu_linuxEOL12.04 | 14.04 | 15.10 | 16.04
Qemu1 product
- qemu≤ 2.5.1.1
Ubuntu1 product
- qemu< 2.0.0+dfsg-2ubuntu1.24 | < 1:2.5+dfsg-5ubuntu10.1
4 vendors · 5 products
References
11 links- www.openwall.com/lists/oss-security/2016/02/16/2Mailing ListX Refsource MLISTThird Party AdvisoryREPORT
- bugzilla.redhat.com/show_bug.cgi?id=1304794X Refsource CONFIRMIssue TrackingPatchThird Party Advisory
lists.debian.org/debian-lts-announce/2018/11/msg00038.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.gnu.org/archive/html/qemu-devel/2016-02/msg03374.htmlMailing ListX Refsource MLISTPatchThird Party AdvisoryREPORT