Resource management error in QEMU - CVE-2016-7421
Published: December 10, 2016 / Updated: August 9, 2020
Vulnerability identifier: #VU39981
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2016-7421
CWE-ID: CWE-399
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: QEMU
Affected software:
QEMU
QEMU
Detailed vulnerability description
The vulnerability allows a local privileged user to perform a denial of service (DoS) attack.
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.
How to mitigate CVE-2016-7421
Install update from vendor's website.
Sources
- http://git.qemu.org/?p=qemu.git;a=commit;h=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