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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2017-09-12T15:00:00

Updated: 2024-08-05T19:20:41.545Z

Reserved: 2017-09-12T00:00:00

Link: CVE-2017-14318

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2017-09-12T15:29:00.300

Modified: 2017-11-30T02:29:03.417

Link: CVE-2017-14318

cve-icon Redhat

Severity : Important

Publid Date: 2017-09-12T00:00:00Z

Links: CVE-2017-14318 - Bugzilla