Date: Wed, 19 Dec 2018 00:45:34 +0530 (IST) From: P J P <ppandit@...hat.com> To: oss security list <oss-security@...ts.openwall.com> cc: Cfir Cohen <cfir@...gle.com> Subject: CVE-2018-16882 Kernel: KVM: nVMX: use after free in posted interrupt processing 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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