CVE-2023-46837 arm32: The cache may not be properly cleaned/invalidated (take two)

2024-01-0516:36:10

XEN

www.cve.org

arm32

cache cleaning

memory writes

overflow

xsa-437

4.3 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.3%

JSON

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.

CNA Affected

[
  {
    "defaultStatus": "unknown",
    "product": "Xen",
    "vendor": "Xen",
    "versions": [
      {
        "status": "unknown",
        "version": "consult Xen advisory XSA-447"
      }
    ]
  }
]