Resource management error in xen (Alpine package)

1) Resource management error

EUVDB-ID: #VU46969

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25598

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to missing unlock in XENMEM_acquire_resource error path in Xen. A malicious HVM stubdomain can cause an RCU reference to be leaked.  This causes subsequent administration operations, (e.g. CPU offline) to livelock, resulting in a host denial of service.

The vulnerability only affects VMs using HVM stubdomains.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.12.1-r0 - 4.14.0-r0

External links

http://git.alpinelinux.org/aports/commit/?id=f48590ae54ca9e0c3bf6b3fae3e6b065f14223e3

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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