CVE-2016-1922

Severity: medium (CVSS 5.5 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: 2016-12-29 · updated 2026-06-17
Weakness: CWE-476

Description

QEMU (aka Quick Emulator) built with the TPR optimization for 32-bit Windows guests support is vulnerable to a null pointer dereference flaw. It occurs while doing I/O port write operations via hmp interface. In that, 'current_cpu' remains null, which leads to the null pointer dereference. A user or process could use this flaw to crash the QEMU instance, resulting in DoS issue.

Affected products

Debian Linux: 7.0, 8.0
QEMU: through 2.5.1.1

References

http://www.debian.org/security/2016/dsa-3469
http://www.debian.org/security/2016/dsa-3470
http://www.debian.org/security/2016/dsa-3471
http://www.openwall.com/lists/oss-security/2016/01/16/1
http://www.openwall.com/lists/oss-security/2016/01/16/6
http://www.securityfocus.com/bid/81058
https://bugzilla.redhat.com/show_bug.cgi?id=1283934
https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg02812.html
https://security.gentoo.org/glsa/201604-01
http://www.debian.org/security/2016/dsa-3469
http://www.debian.org/security/2016/dsa-3470
http://www.debian.org/security/2016/dsa-3471

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