6.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
4.9 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
0.001 Low
EPSS
Percentile
25.9%
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.
6.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
4.9 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
0.001 Low
EPSS
Percentile
25.9%