An issue exists in Xen up to and including 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
xen xen |
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xen xen 4.13.0 |
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fedoraproject fedora 32 |
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