CVE-2016-9915

Memory leak in hw/9pfs/9p-handle.c in QEMU (aka Quick Emulator) allows local privileged guest OS users to cause a denial of service (host memory consumption and possibly QEMU process crash) by leveraging a missing cleanup operation in the handle backend.

Weakness

The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.

Affected Software

Name	Vendor	Start Version	End Version
Qemu	Qemu	*	2.7.1 (including)
Qemu	Qemu	2.8.0-rc0 (including)	2.8.0-rc0 (including)
Qemu	Qemu	2.8.0-rc1 (including)	2.8.0-rc1 (including)
Qemu	Ubuntu	trusty	*
Qemu	Ubuntu	upstream	*
Qemu	Ubuntu	xenial	*
Qemu	Ubuntu	yakkety	*
Qemu-kvm	Ubuntu	precise	*
Qemu-kvm	Ubuntu	precise/esm	*
Qemu-kvm	Ubuntu	upstream	*

Potential Mitigations

Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
For example, glibc in Linux provides protection against free of invalid pointers.
When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.

NVD	https://nvd.nist.gov/vuln/detail/CVE-2016-9915
CWE	https://cwe.mitre.org/data/definitions/401.html

Missing Release of Memory after Effective Lifetime

Weakness

Affected Software

Potential Mitigations

References