Important: kernel

Issue Overview: A flaw was found in the x86 KVM subsystem in kvmstealtimesetpreempted in arch/x86/kvm/x86.c in the Linux kernel. Unprivileged guest users can compromise the guest kernel because TLB flush operations are mishandled in certain KVMVCPUPREEMPTED situations. CVE-2022-39189 In the Linux...

USN-6149-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities

Patryk Sondej and Piotr Krysiuk discovered that a race condition existed in the netfilter subsystem of the Linux kernel when processing batch requests, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service system crash or possibly execute arbitrar...

The vulnerability of the kvm_steal_time_set_preempted() function in the arch/x86/kvm/x86.c module of the Linux operating system allows a hacker to gain access to protected information.

The vulnerability of the kvmstealtimesetpreempted function in the arch/x86/kvm/x86.c module of the Linux operating system’s kernel is related to incorrect status messages for virtual processors. Exploiting this vulnerability could allow an attacker to gain access to protected information...

The vulnerability of the x86_emulate_insn function in the arch/x86/kvm/emulate.c component of the Linux operating system’s kernel allows a hacker to cause a service failure.

The vulnerability of the x86emulateinsn function in the arch/x86/kvm/emulate.c component of the Linux operating system’s kernel is related to pointer arithmetic errors. Exploiting this vulnerability allows an attacker to cause a service failure...

kernel: KVM: nVMX: missing IBPB when exiting from nested guest can lead to Spectre v2 attacks

A flaw was found in the KVM's Intel nested virtualization feature nVMX. Since L1 and L2 shared branch prediction modes guest-user and guest-kernel, KVM did not protect indirect branches in L1 from steering by a malicious agent in L2. This could allow a malicious nested guest to carry out Spectre ...

kernel: KVM: x86/xen: Initialize Xen timer only once

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/xen: Initialize Xen timer only once Add a check for existing xen timers before initializing a new one. Currently kvmxeninittimer is called on every KVMXENVCPUATTRTYPETIMER, which is causing the following ODEBUG crash whe...

kernel: Linux kernel KVM: Denial of Service via incorrect NX bit handling in NPT

A flaw was found in the Linux kernel's Kernel-based Virtual Machine KVM component. When KVM uses Nested Page Tables NPT with NX huge page mitigation enabled, it incorrectly handles the No-Execute NX bit in Shadow Page Table Entries SPTE. This improper handling can be triggered by a local attacker...

kernel: KVM: NULL pointer dereference in kvm_mmu_invpcid_gva

A flaw was found in KVM. With shadow paging enabled if INVPCID is executed with CR0.PG=0, the invlpg callback is not set, and the result is a NULL pointer dereference. This flaw allows a guest user to cause a kernel oops condition on the host, resulting in a denial of service...

Important: kernel

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Do all initialization before exposing /dev/kvm to userspace CVE-2022-49932 A use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve local privilege...

USN-5980-1 linux, linux-aws, linux-azure, linux-gcp, linux-gke, linux-gkeop, linux-ibm, linux-kvm, linux-oracle, linux-raspi vulnerabilities

It was discovered that the System V IPC implementation in the Linux kernel did not properly handle large shared memory counts. A local attacker could use this to cause a denial of service memory exhaustion. CVE-2021-3669 It was discovered that the KVM VMX implementation in the Linux kernel did no...

The vulnerability of the kvm_vcpu_ioctl_x86_getdebugregss() function (arch/x86/kvm/x86.c) in the KVM virtualization subsystem of the Linux operating system allows a attacker to gain access to protected information.

The vulnerability of the kvmvcpuioctlx86getdebugregss function arch/x86/kvm/x86.c in the KVM virtualization subsystem of the Linux operating system is related to errors during initialization. Exploiting this vulnerability can allow an attacker to gain access to protected information...

DEBIAN-CVE-2023-1513

A flaw was found in KVM. When calling the KVMGETDEBUGREGS ioctl, on 32-bit systems, there might be some uninitialized portions of the kvmdebugregs structure that could be copied to userspace, causing an information leak...

SUSE CVE-2023-1513

A flaw was found in KVM. When calling the KVMGETDEBUGREGS ioctl, on 32-bit systems, there might be some uninitialized portions of the kvmdebugregs structure that could be copied to userspace, causing an information leak...

Important: kernel

Issue Overview: A regression exists in the Linux Kernel within KVM: nVMX that allowed for speculative execution attacks. L2 can carry out Spectre v2 attacks on L1 due to L1 thinking it doesn't need retpolines or IBPB after running L2 due to KVM L0 advertising eIBRS support to L1. An attacker at L...

USN-5911-1 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.19, linux-ibm, linux-lowlatency, linux-oracle vulnerabilities

It was discovered that the Upper Level Protocol ULP subsystem in the Linux kernel did not properly handle sockets entering the LISTEN state in certain protocols, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service system crash or possibly execut...

SUSE CVE-2009-2287

The kvmarchvcpuioctlsetsregs function in the KVM in Linux kernel 2.6 before 2.6.30, when running on x86 systems, does not validate the page table root in a KVMSETSREGS call, which allows local users to cause a denial of service crash or hang via a crafted cr3 value, which triggers a NULL pointer...

SUSE CVE-2010-0298

The x86 emulator in KVM 83 does not use the Current Privilege Level CPL and I/O Privilege Level IOPL in determining the memory access available to CPL3 code, which allows guest OS users to cause a denial of service guest OS crash or gain privileges on the guest OS by leveraging access to a 1 IO...

SUSE CVE-2010-0419

The x86 emulator in KVM 83, when a guest is configured for Symmetric Multiprocessing SMP, does not properly restrict writing of segment selectors to segment registers, which might allow guest OS users to cause a denial of service guest OS crash or gain privileges on the guest OS by leveraging...

SUSE CVE-2012-2137

Buffer overflow in virt/kvm/irqcomm.c in the KVM subsystem in the Linux kernel before 3.2.24 allows local users to cause a denial of service crash and possibly execute arbitrary code via vectors related to Message Signaled Interrupts MSI, irq routing entries, and an incorrect check by the...

SUSE CVE-2014-3690

arch/x86/kvm/vmx.c in the KVM subsystem in the Linux kernel before 3.17.2 on Intel processors does not ensure that the value in the CR4 control register remains the same after a VM entry, which allows host OS users to kill arbitrary processes or cause a denial of service system disruption by...