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Tracker / CVE-2022-49568

CVE-2022-49568

Media 5.5

In the Linux kernel, the following vulnerability has been resolved: KVM: Don't null dereference ops->destroy A KVM device cleanup happens in either of two callbacks: 1) destroy() which is called when the VM is being destroyed; 2) release() which is called when a device fd is closed. Most KVM devices use 1) but Book3s's interrupt controller KVM devices (XICS, XIVE, XIVE-native) use 2) as they need to close and reopen during the machine execution. The error handling in kvm_ioctl_create_device() assumes destroy() is always defined which leads to NULL dereference as discovered by Syzkaller. This adds a checks for destroy!=NULL and adds a missing release(). This is not changing kvm_destroy_devices() as devices with defined release() should have been removed from the KVM devices list by then.

Prodotti e versioni affette

linux linux_kernel
linux linux_kernel · … → 5.4.210
linux linux_kernel · 5.11 → 5.15.58
linux linux_kernel · 5.16 → 5.18.15
linux linux_kernel · 5.5 → 5.10.134

Analisi

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Riferimenti