Date: Tue, 18 Dec 2018 14:24:08 -0500 From: Alex Gaynor <alex.gaynor@...il.com> To: oss-security@...ts.openwall.com Cc: Cfir Cohen <cfir@...gle.com> 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. Cheers, Alex On Tue, Dec 18, 2018, 2:16 PM P J P <ppandit@...hat.com 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: > --------------- > -> https://marc.info/?l=kvm&m=154514994222809&w=2 > > This issue was reported by Cfir Cohen of google.com. > > Thank you. > -- > Prasad J Pandit / Red Hat Product Security Team > 47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F >
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