Bug 491614 – Kernel : kvm: memory leak when memory slot is moved with assigned device (CVE-2013-4592)

• Status: RESOLVED FIXED
• Product: Gentoo Security

[Description Agostino Sarubbo 2013-11-18 19:38:14 UTC]

From ${URL} :

When a user memory slot is moved (ie. the base_gfn changes), iommu pages are neither unpinned nor 
unmapped.  The memory for these pages then cannot be recovered without rebooting the system.

Local user with ability to assign device (with access to PCI sysfs files for a device) could use 
this flaw to DoS the system.

Upstream fixes:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=12d6e7538e2d418c08f082b1b44ffa5fb7270ed8
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e40f193f5bb022e927a57a4f5d5194e4f12ddb74

[Comment 1 GLSAMaker/CVETool Bot 2013-11-27 21:40:17 UTC]

CVE-2013-4592 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-4592):
  Memory leak in the __kvm_set_memory_region function in virt/kvm/kvm_main.c
  in the Linux kernel before 3.9 allows local users to cause a denial of
  service (memory consumption) by leveraging certain device access to trigger
  movement of memory slots.

[Comment 2 John Helmert III 2022-03-25 16:39:40 UTC]

Fixes in 3.4.72 onward