RLSA-2021:3547 Moderate: kernel-rt security and bug fix update

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fixes: kernel: SVM nested virtualization issue in KVM AVIC support CVE-2021-3653 For more details about the security issues, including the impact...

kernel-rt security and bug fix update

An update is available for kernel-rt. This update affects Rocky Linux 8. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list The kernel-rt packages provide the Real Time Linux Kernel, which enables...

CentOS 8 : kernel (CESA-2021:3548)

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2021:3548 advisory. - kernel: SVM nested virtualization issue in KVM AVIC support CVE-2021-3653 Note that Nessus has not tested for this issue but has instead relied only on the...

Medium: kernel

Issue Overview: 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 "intctl" field, this issue could...

RHEL 8 : kernel-rt (RHSA-2021:3547)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:3547 advisory. The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Securi...

Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-5072-1)

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5072-1 advisory. Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable...

Ubuntu 16.04 ESM / 18.04 LTS : Linux kernel vulnerabilities (USN-5073-1)

The remote Ubuntu 16.04 ESM / 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5073-1 advisory. Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM ...

Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-5071-1)

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5071-1 advisory. Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM ...

Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-5070-1)

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5070-1 advisory. Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable...

USN-5072-1 linux-azure-5.8, linux-oem-5.10 vulnerabilities

Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a guest VM could use this to read or write portions of the host's physical memory...

Ubuntu 16.04 ESM : Linux kernel vulnerability (USN-5062-1)

The remote Ubuntu 16.04 ESM host has a package installed that is affected by a vulnerability as referenced in the USN-5062-1 advisory. Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in...

CVE-2021-29657

A flaw was found in the Linux kernel. A KVM guest on AMD can launch a nested guest without the Intercept VMRUN control bit by exploiting a TOCTOU vulnerability in nestedsvmvmrun. A malicious guest could use this flaw to gain unrestricted access to host MSRs, possibly leading to guest-to-host esca...

CVE-2021-3653

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 "intctl" field, this issue could allow a malicious ...

CVE-2021-3656

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 "virtext" field, this issue could allow a malicious...

CVE-2021-3656

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 "virtext" field, this issue could allow a malicious...

UBUNTU-CVE-2021-3656

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 "virtext" field, this issue could allow a malicious...

CVE-2021-3653

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 "intctl" field, this issue could allow a malicious ...

UBUNTU-CVE-2021-3653

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 "intctl" field, this issue could allow a malicious ...

Oracle Linux 7 : Unbreakable Enterprise kernel-container (ELSA-2021-9422)

The remote Oracle Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2021-9422 advisory. - KVM: nSVM: always intercept VMLOAD/VMSAVE when nested Maxim Levitsky Orabug: 33205367 CVE-2021-3656 Tenable has extracted the preceding description...

KVM 安全漏洞

KVM is a kernel-based virtual machine. A security vulnerability exists in the AMD code for KVM, which stems from incorrect validation of "virtext" when processing VMCBs Virtual Machine Control Blocks provided by L1 guests to generate/process nested guests L2...