Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fixed the host’s stage-2 PGD refcount issue The KVM page-table library counts the pages of concatenated stage-2 PGs individually. However, when KVM runs in protected mode, the host’s stage-2 PGD is currently managed b...

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 vulnerabilities have been resolved: KVM: x86: Fixed a stack-out-of-bounds memory access from ioapicwriteindirect. KASAN reports the following issue: BUG: In kvmmakevcpusrequestmask+0x174/0x440 kvm, there is a stack-out-of-bounds situation. A read of size 8 at...

Astra Linux – Vulnerability in Linux, Linux 5.10

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 in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: A WARN message is generated on vNMI when an NMI window is requested, provided that the NMIs are effectively masked. This occurs only if the vCPU is already handling an NMI. KVM’s approach for handling simultaneous NMIs ...

Astra Linux – Vulnerability in Linux 5.10, Linux

A flaw was discovered in the Linux kernel’s implementation of proxied virtualized TPM devices. In a system where virtualized TPM devices are enabled which is not the default setting, a local attacker can exploit this flaw to create a “use-after-free” condition, potentially allowing them to escala...

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: 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 5.15

A flaw was discovered in KVM AMD Secure Encrypted Virtualization SEV within the Linux kernel. A KVM guest that uses SEV-ES or SEV-SNP with multiple vCPUs can trigger a double fetch race condition vulnerability and invoke the VMGEXIT handler recursively. If an attacker manages to call the handler...

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 validated by temporarily loading it into the fpc register...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: The existing SPTE is dropped/zapped even when creating an MMIO SPTE. When installing an emulated MMIO SPTE, do so after dropping/zapping the existing SPTE if it’s shadow-present. While the commit a54aa15c6bda3 was...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: KVM: arm64: Fixed a shift-out-of-bounds bug Fixed a shift-out-of-bounds bug reported by UBSAN when running VMs with MTE enabled on host kernels. UBSAN: Shift-out-of-bounds in arch/arm64/kvm/sys regs.c:1988:14 The shift exponen...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: mm: gup: stop abusing trygrabfolio A kernel warning was reported when pinning folio in CMA memory during the launch of the SEV virtual machine. The error message looks like this: 464.325306 WARNING: CPU: 13 PID: 6734 at...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: PCI: hv: Fixed double calls to idafree in the hvpciprobe error path. If hvpciprobe fails after storing the domain number in hbus-bridge-domainNr, a call to free this domainNr is made via pciBusReleaseEmulDomainNr. However, during...

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, Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: x86/ioremap: Maps EFI-reserved memory as encrypted for SEV. Some drivers require memory that is marked as EFI boot services data. To prevent this memory from being reused by the kernel after ExitBootServices, efimemreserve is use...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV – Lock all vCPUs when synchronizing VMSAs for SNP launches to complete. Lock all vCPUs when synchronizing and encrypting VMSAs for SNP guests. Allowing the user space to manipulate or run a vCPU while its state is being...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM – Writing hgatp registers with valid mode bits According to the RISC-V Privileged Architecture Specification, when MODE=Bare is selected, software must write zero to the remaining fields of hgatp. We have previously...

Astra Linux – Vulnerability in Linux 5.10

A vulnerability was discovered in the kvms390guestsidaop function within the arch/s390/kvm/kvm-s390.c file in KVM for s390 in the Linux kernel. This flaw allows a local attacker with normal user privileges to gain unauthorized memory write access. This vulnerability affects Linux kernel versions...

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...