Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: perf/x86/intel: KVM: The mask PEBSENABLE must be loaded for guests with a specified vCPU value. When generating the MSRIA32PEBSENABLE value that will be loaded on the VM-Entry to a KVM guest, the value should be masked with the...

Astra Linux – Vulnerability in Linux 5.10, Linux

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Do not generate errors if the user space injects an interrupt with GIF=0. Do not generate errors or warnings during interrupt injection when GIF is cleared. It is trivial for the user space to force this situation using...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: PCI: hv: Fixed a crash in hvpcirestoremsimsg during hibernation. When a Linux virtual machine with a assigned PCI device runs on Hyper-V, if the PCI device driver is not yet loaded i.e., MSI-X/MSI is not enabled on the device,...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Check instead of asserting on nested TSC scaling support Check for nested TSC scaling support on nested SVM VMRUN instead of asserting that TSC scaling is exposed to L1 if L1’s MSRAMD64TSCRATIO has diverged from KVM’s...

Astra Linux – Vulnerability in Linux

The file arch/powerpc/kvm/book3srtas.c in the Linux kernel, as of version 5.13.5 on the PowerPC platform, allows KVM guest OS users to cause memory corruption in the host OS through rtasargs.nargs, also known as CID-f62f3c20647e...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: KVM: x86 – Handling of SRCU initialization failures during page track initialization Check the return value of initsrcustruct, which may fail due to OOM conditions when initializing the page track mechanism. Lack of checking lead...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Forcibly leave nested virtualization mode when SMM state is toggled The nested virtualization mode is forcibly exited if the user space toggles the SMM state using KVMSETVCPUEVENTS or KVMSYNCX86EVENTS. If the user space...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: scsi: qedf: Add stagwork to all the vports A call trace was observed when creating NPIV ports. Only 32 out of 64 ports are shown as online. The stagwork was not initialized for the vports; therefore, it needs to be initialized...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM – Fix for a panic occurring on an out-of-bounds guest IRQ. Since the guestIRQ comes from the KVMIRQFD API call, it may trigger a crash in svmupdatepiirte, due to an out-of-bounds access. Crash output: pid: 22218 task:...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM – Use kzalloc for SEV ioctl interfaces to prevent kernel data leaks. For some SEV ioctl interfaces, the length parameter passed may be less than or equal to SEVFWBLOBMAXSIZE, but larger than the data returned by the PSP...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: KVM: x86/pmu: Disabled support for adaptive PEBS. Support for virtualizing adaptive PEBS has been discontinued. This is because KVM’s implementation is architecturally broken without an obvious or easy way to address the issue...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: KVM: x86 – Mark the target gfn of the emulated atomic instruction as dirty When emulating an atomic access on behalf of the guest, mark the target gfn as dirty if the CMPXCHG instruction attempts to be executed and fails without ...

Astra Linux – Vulnerability in Linux 5.10, Linux, Linux 5.15

A issue was discovered in arch/x86/kvm/vmx/nested.c in the Linux kernel before 6.2.8. nVMX on x8664 lacks consistency checks for CR0 and CR4...

Astra Linux – Vulnerabilities in Linux, Linux-5.10, Linux-5.15, Linux-6.1

Transmitted requests in Xen’s virtual network protocol can consist of multiple parts. Although none of them are actually useful, except for the initial part, any of these parts can be of zero length, meaning they carry no data at all. Apart from the certain initial portion of the data to be...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, Linux, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: KVM: Always flush the async PF workqueue when a vCPU is being destroyed. Whenever a vCPU clears its completion queue, i.e., when a VM and all its vCPUs are being destroyed, the async PF workqueue must always be flushed. KVM must...

Astra Linux – Vulnerability in Xen

A issue was discovered in Xen through version 4.11.x, allowing users of x86 Intel HVM guest operating systems to obtain unintended read/write DMA access. This could potentially lead to a denial of service causing the host operating system to crash or result in privilege escalation. This issue...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, and Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: scsi: xen: scsiback: Fixed a potential memory leak in scsibackremove. The memory allocated for the struct vscsiblkinfo structure in scsibackprobe is not freed in scsibackRemove, resulting in potential memory leaks during the...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: “PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV” This fix reverts to commit 05703271c3cd “PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV”, which caused a deadlock by recursively takin...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Ignore -EBUSY when checking nested events from vcpublock Ignore -EBUSY when checking nested events after exiting a blocking state. This applies when L2 is active; exiting to userspace will typically result in a spurious...

Astra Linux – Vulnerability in Linux 5.10, Linux

In the Linux kernel, the following vulnerability has been resolved: serial: amba-pl011: avoid SBSA UART accessing the DMACR register The chapter “B Generic UART” in “ARM Server Base System Architecture” 1 describes a generic UART interface. Such a generic UART does not support DMA. In current cod...