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CVE-2022-2153: KVM: x86: Avoid theoretical NULL pointer dereference in kvm_irq_deliv… · torvalds/linux@00b5f37

A flaw was found in the Linux kernel’s KVM when attempting to set a SynIC IRQ. This issue makes it possible for a misbehaving VMM to write to SYNIC/STIMER MSRs, causing a NULL pointer dereference. This flaw allows an unprivileged local attacker on the host to issue specific ioctl calls, causing a kernel oops condition that results in a denial of service.

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KVM: x86: Avoid theoretical NULL pointer dereference in kvm_irq_deliv…

…ery_to_apic_fast()

When kvm_irq_delivery_to_apic_fast() is called with APIC_DEST_SELF shorthand, ‘src’ must not be NULL. Crash the VM with KVM_BUG_ON() instead of crashing the host.

Signed-off-by: Vitaly Kuznetsov [email protected] Message-Id: [email protected] Cc: [email protected] Signed-off-by: Paolo Bonzini [email protected]

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