Resource management error in xen (Alpine package)

1) Resource management error

EUVDB-ID: #VU46980

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-2020-25603

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to event channels control structures can be accessed lockless as long as the port is considered to be valid. Such sequence is missing appropriate memory barrier (e.g smp_*mb()) to prevent both the compiler and CPU to re-order access. A malicious guest may be able to cause a hypervisor crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.10.1-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.