A flaw was found in Linux kernel's KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host's userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu variables. An attacker can use this to escalate their privileges.

A flaw was found in Linux kernel's KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host's userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu variables. An attacker can use this to escalate their privileges.

kernel: Use-after-free in snd_pcm_info function in ALSA subsystem potentially leads to privilege escalation kernel: Use-after-free in snd_seq_ioctl_create_port() Kernel: hw: cpu: L1 terminal fault (L1TF) Kernel: hw: cpu: L1 terminal fault (L1TF) Kernel: speculative bounds check bypass store kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack) kernel: race condition in snd_seq_write() may lead to UAF or OOB-access kernel: kvm: vmx: host GDT limit corruption kernel: Race condition in sound system can lead to denial of service

Affected: Ubuntu:18.04:LTS: linux-azure-edge

A flaw was found in Linux kernel's KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host's userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu variables. An attacker can use this to escalate their privileges.

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