Astra Linux – Vulnerability in Linux 6.1

A flaw was discovered in KVM. An improper check in svmsetx2apicmsrinterception may allow direct access to the host’s x2apic MSRs when the guest resets its APIC, potentially leading to a denial-of-service condition...

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 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...

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 found in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: KVM: VMX: Fixed a crash caused by uninitialized currentvmcs. KVM enables “Enlightened VMCS” and “Enlightened MSR Bitmap” when running as a nested hypervisor on top of Hyper-V. When the MSR bitmap is updated, the...

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, Linux, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fixed the flushtlbrange function when it is used to erase normal PMD entries PMD entries that point to page tables, along with the PTE entries in the pointed-to page table. In the arm64 version of flushtlbrange, there is ...

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

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: fix in setting the fpc register The function kvmarchvcpuioctlsetfpu allows for setting the floating-point control fpc register of a guest CPU. The new value is tested for validity by temporarily loading it into the fpc...

Astra Linux – Vulnerability in Qemu

A flaw was discovered in the implementation of the 9p passthrough filesystem 9pfs in QEMU. The 9pfs server did not prevent the opening of special files on the host side, potentially allowing a malicious client to escape from the exported 9p tree by creating and opening a device file in the shared...

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

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Do not recheck L1 intercepts when completing userspace I/O When completing the emulation of instructions that generate a userspace exit for I/O, do not recheck L1 intercepts since KVM has already completed that phase of...

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: KVM: x86: Resets the IRTE to host control if the new route cannot be posted. Restores an IRTE back to host control either remapped or in MSI mode if the new GSI route prevents direct posting of the IRQ to a vCPU, regardless of th...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Remove the user-triggered WARN message emitted by nestedsvmloadcr3. Remove the WARN message generated by svmsetnestedstate in nestedsvmloadcr3 failure cases. This message can be easily triggered from userspace by...

Astra Linux – Vulnerability in Linux

A issue was discovered in Linux: improper handling of VMIO|VMPFNMAP vmas in KVM can bypass RO checks and cause pages to be freed while still accessible by the VMM and guest. This allows users who have the ability to start and control a VM to read/write random pages of memory, potentially leading ...

Astra Linux – Vulnerability in Linux

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Immediately reset the MMU context when the SMM flag is cleared The MMU context should be reset immediately when the SMM flag of the vCPU is cleared, so that the SMM flag in the MMU context is always synchronized with th...

Astra Linux – Vulnerability in Qemu

A use-after-free vulnerability was discovered in the virtio-net device of QEMU. This vulnerability can occur when the address of the descriptor belongs to the non-direct access region, due to the numbuffers being set after the virtqueue elem has been unmapped. A malicious guest can exploit this...

Astra Linux – Vulnerability in libvirt

A flaw was discovered in the libvirt libxl driver. A malicious guest could continuously reboot itself, causing libvirtd on the host to become locked out or crash, resulting in a denial-of-service condition...

Astra Linux – Vulnerability in Linux 5.10, Linux

A flaw was discovered in KVM. When updating a guest’s page table entry, vmpgoff was incorrectly used as the offset to obtain the page’s pfn. Since vaddr and vmpgoff are controllable by user-mode processes, this flaw allows unprivileged local users on the host to write outside the userspace region...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Warns when a triple fault assertion never “escapes” from L2 The warnings are removed because they perform a sanity check that ensures KVM never allows a triple fault in L2 to escape and end up in L1. In normal operation...

Astra Linux – Vulnerability in Linux 5.15

A NULL pointer dereference flaw was discovered in the Linux kernel’s KVM module. This flaw can lead to a denial of service in the x86emulateinsn function in arch/x86/kvm/emulate.c. The flaw occurs when an illegal instruction is executed on the guest CPU of the Intel model...