CVE-2016-7421

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-12-10 · updated 2026-06-17
Weakness: CWE-834

Description

The pvscsi_ring_pop_req_descr function in hw/scsi/vmw_pvscsi.c in QEMU (aka Quick Emulator) allows local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by leveraging failure to limit process IO loop to the ring size.

Affected products

Debian Linux: 8.0
QEMU: through 2.7.1

References

http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=d251157ac1928191af851d199a9ff255d330bec9
http://www.openwall.com/lists/oss-security/2016/09/16/3
http://www.openwall.com/lists/oss-security/2016/09/16/9
http://www.securityfocus.com/bid/92998
https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03609.html
https://security.gentoo.org/glsa/201609-01
http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=d251157ac1928191af851d199a9ff255d330bec9
http://www.openwall.com/lists/oss-security/2016/09/16/3
http://www.openwall.com/lists/oss-security/2016/09/16/9
http://www.securityfocus.com/bid/92998
https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html

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