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Date: Tue, 18 Dec 2018 14:24:08 -0500
From: Alex Gaynor <>
Cc: Cfir Cohen <>
Subject: Re: CVE-2018-16882 Kernel: KVM: nVMX: use after free
 in posted interrupt processing

Can you say more about why this is only a DoS? The commit message sounds
(to someone with little domain expertise in KVM) like a fairly traditional
pattern for an exploitable for code exec uaf.


On Tue, Dec 18, 2018, 2:16 PM P J P < wrote:

>    Hello,
> A use after free issue was found in the way Linux kernel's KVM hypervisor
> processed posted interrupts, when nested(=1) virtualization is enabled. In
> nested_get_vmcs12_pages(), in case of an error while processing posted
> interrupt address, it unmaps the 'pi_desc_page' without resetting
> 'pi_desc'
> descriptor address. Which is latter used in pi_test_and_clear_on().
> A guest user/process could use this flaw to crash the host kernel
> resulting in
> DoS.
> Upstream patch:
> ---------------
>    ->
> This issue was reported by Cfir Cohen of
> Thank you.
> --
> Prasad J Pandit / Red Hat Product Security Team
> 47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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