A use-after-free issue was found in the way the Linux kernel's KVM hypervisor processed posted interrupts when nested(=1) virtualization is enabled. In nested_get_vmcs12_pages(), in case of an error while processing posted interrupt address, it unmaps the 'pi_desc_page' without resetting 'pi_desc' descriptor address, which is later used in pi_test_and_clear_on(). A guest user/process could use this flaw to crash the host kernel resulting in DoS or potentially gain privileged access to a system. Kernel versions prior to 4.14.91 and prior to 4.19.13 are vulnerable.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
linux linux kernel |
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canonical ubuntu linux 16.04 |
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canonical ubuntu linux 14.04 |
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canonical ubuntu linux 18.04 |
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canonical ubuntu linux 18.10 |
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