#VU3355 Improper check or handling of exceptional conditions in Linux kernel and Xen - CVE-2015-5307

Vulnerability identifier: #VU3355

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-2015-5307

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 #AC (aka Alignment Check) exceptions, related to svm.c and vmx.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 - 4.6.3

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External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54a20552e1eae07aa240fa...

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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.