Out-of-Bounds Affecting xen package, versions <4.17.3+10-g091466ba55-1~deb12u1


Severity

Recommended
0.0
low
0
10

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Threat Intelligence

EPSS
0.05% (18th percentile)

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  • Snyk IDSNYK-DEBIAN12-XEN-6123900
  • published13 Dec 2023
  • disclosed5 Jan 2024

Introduced: 13 Dec 2023

CVE-2023-46837  (opens in a new tab)
CWE-119  (opens in a new tab)

How to fix?

Upgrade Debian:12 xen to version 4.17.3+10-g091466ba55-1~deb12u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

Arm provides multiple helpers to clean & invalidate the cache for a given region. This is, for instance, used when allocating guest memory to ensure any writes (such as the ones during scrubbing) have reached memory before handing over the page to a guest.

Unfortunately, the arithmetics in the helpers can overflow and would then result to skip the cache cleaning/invalidation. Therefore there is no guarantee when all the writes will reach the memory.

This undefined behavior was meant to be addressed by XSA-437, but the approach was not sufficient.

CVSS Scores

version 3.1