CVE-2016-5126: canonical ubuntu_linux Out-of-bounds Write
Vulnerability summary
CVE-2016-5126 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 0.70% chance of exploitation in the next 30 days, higher than 53.2% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 16 · Related 8Timeline
- 01-06-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
Heap-based buffer overflow in the iscsi_aio_ioctl function in block/iscsi.c in QEMU allows local guest OS users to cause a denial of service (QEMU process crash) or possibly execute arbitrary code via a crafted iSCSI asynchronous I/O ioctl call.
CVSS metrics
5 scores · 3 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.70%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.70% 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.
Redhat8 products
- enterprise_linux_desktop7.0
- enterprise_linux_eus7.2 | 7.3 | 7.4 | 7.5 | 7.6 | 7.7
- enterprise_linux_server7.0
- enterprise_linux_server_aus7.2 | 7.3 | 7.4 | 7.6 | 7.7
- enterprise_linux_server_tus7.2 | 7.3 | 7.6 | 7.7
Debian2 products
- qemu< 1:2.6+dfsg-2
- debian_linuxEOL8.0
Canonical1 product
- ubuntu_linuxEOL12.04 | 14.04 | 16.04
Oracle1 product
- linuxEOL7
Qemu1 product
- qemu≤ 2.6.2
Ubuntu1 product
- qemu< 2.0.0+dfsg-2ubuntu1.26 | < 1:2.5+dfsg-5ubuntu10.3
6 vendors · 14 products
References
22 links- www.openwall.com/lists/oss-security/2016/05/30/6Mailing ListX Refsource MLISTThird Party AdvisoryREPORT
- www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.htmlX Refsource CONFIRMThird Party Advisory
Show all 22 references
- lists.gnu.org/archive/html/qemu-block/2016-05/msg00779.htmlMailing ListX Refsource MLISTPatchThird Party AdvisoryREPORT
lists.debian.org/debian-lts-announce/2019/09/msg00021.htmlMailing ListX Refsource MLISTThird Party Advisory