NULL pointer dereference in Xen - CVE-2016-5242
Published: June 7, 2016 / Updated: July 28, 2020
Vulnerability identifier: #VU32258
CSH Severity: Medium
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H]
CVE-ID: CVE-2016-5242
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in arch/arm/p2m.c in Xen 4.4.x through 4.6.x allows local guest OS users with access to the driver domain to cause a denial of service (NULL pointer dereference and host OS crash) by creating concurrent domains and holding references to them, related to VMID exhaustion. <a href="http://cwe.mitre.org/data/definitions/476. A remote attacker can perform a denial of service (DoS) attack.
Affected software
Xen
xen (Alpine package)
xen (Alpine package)
How to mitigate CVE-2016-5242
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
xen (Alpine package) - update to 4.4.4-r0