Vulnerability Details : CVE-2016-7421
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.
Vulnerability category: Denial of service
Products affected by CVE-2016-7421
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2016-7421
0.11%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 26 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2016-7421
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST | |
|
4.4
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H |
0.8
|
3.6
|
NIST |
CWE ids for CVE-2016-7421
-
The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed.Assigned by: nvd@nist.gov (Primary)
References for CVE-2016-7421
-
https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03609.html
[Qemu-devel] [PULL 07/17] scsi: pvscsi: limit process IO loop to ring siPatch;Third Party Advisory
-
http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=d251157ac1928191af851d199a9ff255d330bec9
QEMU · GitLab
-
http://www.securityfocus.com/bid/92998
QEMU Infinite Loop CVE-2016-7421 Denial of Service VulnerabilityThird Party Advisory;VDB Entry
-
http://www.openwall.com/lists/oss-security/2016/09/16/9
oss-security - Re: CVE Request: Qemu: scsi: pvscsi: infinite loop when processing IO requestsMailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
[SECURITY] [DLA 1599-1] qemu security updateMailing List;Third Party Advisory
-
https://security.gentoo.org/glsa/201609-01
QEMU: Multiple vulnerabilities (GLSA 201609-01) — Gentoo securityThird Party Advisory
-
http://www.openwall.com/lists/oss-security/2016/09/16/3
oss-security - CVE Request: Qemu: scsi: pvscsi: infinite loop when processing IO requestsMailing List;Third Party Advisory
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