Description

A parameter verification issue was discovered in Xen through 4.9.x. The function `alloc_heap_pages` allows callers to specify the first NUMA node that should be used for allocations through the `memflags` parameter; the node is extracted using the `MEMF_get_node` macro. While the function checks to see if the special constant `NUMA_NO_NODE` is specified, it otherwise does not handle the case where `node >= MAX_NUMNODES`. This allows an out-of-bounds access to an internal array.

References

http://www.securityfocus.com/bid/100818

http://www.securitytracker.com/id/1039348

http://xenbits.xen.org/xsa/advisory-231.html

https://lists.debian.org/debian-lts-announce/2018/10/msg00009.html

https://support.citrix.com/article/CTX227185

https://www.debian.org/security/2017/dsa-4050

Details

Risk Information

CVSS v2

CVSS v3