Alpine: xen: security update to 0

high Tenable Cloud Security Plugin ID 407730

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

- An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux
kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped.
However, the handler may not have time to run if the frontend quickly toggles between the states connect
and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving
guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege
escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.
(CVE-2020-29569)

- An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are
processing watch events using a single thread. If the events are received faster than the thread is able
to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the
backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable. (CVE-2020-29568)

Plugin Details

Severity: High

ID: 407730

Version: Revision 1.26

Type: Local

Family: Alpine Linux Local Security Checks

Published: 10/31/2023

Updated: 2/24/2025

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 95.07

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2020-29569

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 12/15/2020

Reference Information

CVE: CVE-2020-29568, CVE-2020-29569, CVE-2022-21127, CVE-2023-46840

IAVB: 2020-B-0077-S, 2023-B-0090-S

Detections

Analytics