Уязвимость ядра операционной системы Linux, связанная с недостатками разграничения доступа, позволяющая нарушителю повысить свои привилегии

Уязвимость ядра Linux

A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.

A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.

A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.

A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result the L2 guest would be allowed to read/write physical pages of the host resulting in a crash of the entire system leak of sensitive data or potential guest-to-host escape.

A flaw was found in the KVM's AMD code for supporting SVM nested virtu ...

ELSA-2021-9422: Unbreakable Enterprise kernel-container security update (IMPORTANT)

ELSA-2021-9421: Unbreakable Enterprise kernel-container security update (IMPORTANT)

ELSA-2021-9420: Unbreakable Enterprise kernel security update (IMPORTANT)

ELSA-2021-9419: Unbreakable Enterprise kernel security update (IMPORTANT)

Security update for the Linux Kernel (Live Patch 5 for SLE 15 SP3)

Important: kernel-rt security and bug fix update

ELSA-2021-9565: Unbreakable Enterprise kernel-container security update (IMPORTANT)

ELSA-2021-9564: Unbreakable Enterprise kernel security update (IMPORTANT)

ELSA-2021-4056: kernel security, bug fix, and enhancement update (IMPORTANT)

ELSA-2021-3801: kernel security and bug fix update (IMPORTANT)

ELSA-2021-9451: Unbreakable Enterprise kernel-container security update (IMPORTANT)

ELSA-2021-9450: Unbreakable Enterprise kernel security update (IMPORTANT)

ELSA-2022-9245: Unbreakable Enterprise kernel-container security update (IMPORTANT)