Описание
The KVM implementation in the Linux kernel through 4.20.5 has a Use-after-Free.
A use-after-free vulnerability was found in the way the Linux kernel's KVM hypervisor emulates a preemption timer for L2 guests when nested (=1) virtualization is enabled. This high resolution timer(hrtimer) runs when a L2 guest is active. After VM exit, the sync_vmcs12() timer object is stopped. The use-after-free occurs if the timer object is freed before calling sync_vmcs12() routine. A guest user/process could use this flaw to crash the host kernel resulting in a denial of service or, potentially, gain privileged access to a system.
Отчет
This issue does not affect the version of the kernel package as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2. This issue affects the versions of Linux kernel as shipped with Red Hat Enterprise Linux 7. Future kernel updates for Red Hat Enterprise Linux 7 may address this issue. Note: Impact on Red Hat Enterprise Linux 7 kernel is limited, as it requires that nested virtualization feature is enabled on a system. Nested Virtualization feature is available only as - Technology Preview.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | ||
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-alt | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | ||
| Red Hat Enterprise MRG 2 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2019:0833 | 23.04.2019 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2019:0818 | 23.04.2019 |
| Red Hat Enterprise Linux 7.4 Advanced Update Support | kernel | Fixed | RHSA-2019:4058 | 03.12.2019 |
| Red Hat Enterprise Linux 7.4 Telco Extended Update Support | kernel | Fixed | RHSA-2019:4058 | 03.12.2019 |
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Дополнительная информация
Статус:
EPSS
7.5 High
CVSS3
Связанные уязвимости
The KVM implementation in the Linux kernel through 4.20.5 has a Use-after-Free.
The KVM implementation in the Linux kernel through 4.20.5 has a Use-after-Free.
The KVM implementation in the Linux kernel through 4.20.5 has a Use-af ...
The KVM implementation in the Linux kernel through 4.20.5 has a Use-after-Free.
Уязвимость подсистемы виртуализации Kernel-based Virtual Machine (KVM) ядра операционных систем Linux, позволяющая нарушителю вызвать отказ в обслуживании или выполнить произвольный код
EPSS
7.5 High
CVSS3