#VU3002 Improper check or handling of exceptional conditions in Linux kernel and Xen - CVE-2015-8104

Vulnerability identifier: #VU3002

Vulnerability risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-8104

CWE-ID: CWE-703

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system
Xen
Server applications / Virtualization software

Vendor: Linux Foundation
Xen Project

Description
The vulnerability allows an adjacent attacker to cause DoS condition on the target system.

The weakness exists in the KVM subsystem due to many #DB (aka Debug) exceptions, related to svm.c. An adjacent attacker can cause the service to crash.

Mitigation
Update Linux Kernel to 4.2.7 or Xen to 4.7.

Vulnerable software versions

Linux kernel: 4.2.0 - 4.2.6

Xen: 4.3.0 - 4.6.1

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External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cbdb967af3d54993f5814f...

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.