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 before 4.14.91 and before 4.19.13 are vulnerable.
| Version | Score | Severity | Vector String |
|---|---|---|---|
| 3.0 | 6.1 | Medium | CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:H |
| Product | Vendor | Version |
|---|---|---|
| kernel: | The Linux Foundation | 10 Version 1709 for ARM64-based Systems |