CVE-2023-46837 | BDVDB-2026-221113 Detail
XenXen
Description#
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.
Impact#
A malicious guest may be able to read sensitive data from memory that previously belonged to another guest.
Weaknesses#
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References#
- https://xenbits.xenproject.org/xsa/advisory-447.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XLL6SQ6IKFYXLYWITYZCRV5IBRK5G35R/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JFVKWYQFRUU3CAS53THTUKXEOUDWI42G/
- http://xenbits.xen.org/xsa/advisory-447.html
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.