CVE-2018-16882
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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 4.14 | 4.14.91 |
| linux / linux_kernel | 4.15 | 4.19.13 |
| canonical / ubuntu_linux | 16.04 | 16.04.x |
| canonical / ubuntu_linux | 14.04 | 14.04.x |
| canonical / ubuntu_linux | 18.04 | 18.04.x |
| canonical / ubuntu_linux | 18.10 | 18.10.x |
- http://www.securityfocus.com/bid/106254
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16882
- https://lwn.net/Articles/775720/
- https://lwn.net/Articles/775721/
- https://marc.info/?l=kvm&m=154514994222809&w=2
- https://support.f5.com/csp/article/K80557033
- https://usn.ubuntu.com/3871-1/
- https://usn.ubuntu.com/3871-3/
- https://usn.ubuntu.com/3871-4/
- https://usn.ubuntu.com/3871-5/
- https://usn.ubuntu.com/3872-1/
- https://usn.ubuntu.com/3878-1/
- https://usn.ubuntu.com/3878-2/
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