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CVE-2020-2732

Status Candidate

Overview

A flaw was discovered in the way that the KVM hypervisor handled instruction emulation for an L2 guest when nested virtualisation is enabled. Under some circumstances, an L2 guest may trick the L0 guest into accessing sensitive L1 resources that should be inaccessible to the L2 guest.

Related Files

Red Hat Security Advisory 2020-2171-01
Posted May 14, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-2171-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include a null pointer vulnerability.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2020-10711, CVE-2020-2732
MD5 | 731c2063b75951642f69d27fc4cb8f99
Red Hat Security Advisory 2020-2102-01
Posted May 12, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-2102-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include null pointer and privilege escalation vulnerabilities.

tags | advisory, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2020-10711, CVE-2020-11884, CVE-2020-2732
MD5 | 6bee4ede729babfed9ef8a70eacbe4a1
Kernel Live Patch Security Notice LSN-0064-1
Posted Mar 19, 2020
Authored by Benjamin M. Romer

Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested (level 2) guest access the resources of a parent (level 1) guest in certain situations. An attacker could use this to expose sensitive information.

tags | advisory, kernel
systems | linux
advisories | CVE-2020-2732
MD5 | 951ac2ddda0402fb80ea73acdceeffb9
Ubuntu Security Notice USN-4303-1
Posted Mar 17, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4303-1 - Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested guest access the resources of a parent guest in certain situations. An attacker could use this to expose sensitive information.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2020-2732
MD5 | 2f7b31b887ff959d2fd1fa9d1e84e67d
Ubuntu Security Notice USN-4303-2
Posted Mar 17, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4303-2 - USN-4303-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 ESM. Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested guest access the resources of a parent guest in certain situations. An attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2020-2732
MD5 | a78140dff5caa78fc9f538a626d51f66
Ubuntu Security Notice USN-4302-1
Posted Mar 17, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4302-1 - Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested guest access the resources of a parent guest in certain situations. An attacker could use this to expose sensitive information. Gregory Herrero discovered that the fix for CVE-2019-14615 to address the Linux kernel not properly clearing data structures on context switches for certain Intel graphics processors was incomplete. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-15217, CVE-2019-19046, CVE-2019-19051, CVE-2019-19056, CVE-2019-19058, CVE-2019-19066, CVE-2019-19068, CVE-2020-2732, CVE-2020-8832
MD5 | 399774618ce50a03b46b4f27b7f87a67
Ubuntu Security Notice USN-4301-1
Posted Mar 17, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4301-1 - It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information. Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested guest access the resources of a parent guest in certain situations. An attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2019-19053, CVE-2019-19056, CVE-2019-19059, CVE-2019-19066, CVE-2019-19068, CVE-2019-3016, CVE-2020-2732
MD5 | 6b921a608ab319902047d0ad4c3538bd
Ubuntu Security Notice USN-4300-1
Posted Mar 17, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4300-1 - It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information. Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested guest access the resources of a parent guest in certain situations. An attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2019-18809, CVE-2019-19043, CVE-2019-19053, CVE-2019-19056, CVE-2019-19058, CVE-2019-19059, CVE-2019-19064, CVE-2019-19066, CVE-2019-19068, CVE-2019-3016, CVE-2020-2732
MD5 | caa07f46355fbda12c3113a6958695d0
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