An issue was discovered in Xen 4.5.x through 4.9.x. The function `__gnttab_cache_flush` handles GNTTABOP_cache_flush grant table operations. It checks to see if the calling domain is the owner of the page that is to be operated on. If it is not, the owner's grant table is checked to see if a grant mapping to the calling domain exists for the page in question. However, the function does not check to see if the owning domain actually has a grant table or not. Some special domains, such as `DOMID_XEN`, `DOMID_IO` and `DOMID_COW` are created without grant tables. Hence, if __gnttab_cache_flush operates on a page owned by these special domains, it will attempt to dereference a NULL pointer in the domain struct.
CVSS Details
- CVSS 3.0 Base Score: 6.5
- CVSS 3.0 Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xen | Oct 26, 2017 | Sep 12, 2017 |
| Debian | — | Upgrade xen | Nov 29, 2017 | Sep 12, 2017 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Sep 12, 2017 |
| Suse | — | Upgrade xen-kmp-defaultUpgrade xenUpgrade xen-tools-domUUpgrade xen-libs-32bitUpgrade xen-doc-htmlUpgrade xen-develUpgrade xen-libsUpgrade xen-tools | Sep 13, 2017 | Sep 12, 2017 |
| Ubuntu | — | Upgrade xen | Nov 19, 2024 | Sep 12, 2017 |
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