Unchecked Return Value Affecting xen package, versions [0,]


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-UNMANAGED-XEN-2383797
  • published26 Jan 2022
  • disclosed15 Dec 2020
  • creditUnknown

Introduced: 15 Dec 2020

CVE-2020-29569  (opens in a new tab)
CWE-252  (opens in a new tab)

How to fix?

There is no fixed version for xen.

Overview

Affected versions of this package are vulnerable to Unchecked Return Value. 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.

CVSS Scores

version 3.1