CVE-2018-16882: Use After Free
First published: Thu Jan 03 2019(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 | |
| Linux Kernel | >=4.14<4.14.91 | |
| Linux Kernel | >=4.15<4.19.13 | |
| Ubuntu Linux | =14.04 | |
| Ubuntu Linux | =16.04 | |
| Ubuntu Linux | =18.04 | |
| Ubuntu Linux | =18.10 |
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Reference Links
- 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/
- https://marc.info/?l=kvm&m=154514994222809&w=2
- https://launchpad.net/bugs/cve/CVE-2018-16882
- https://git.kernel.org/linus/c2dd5146e9fe1f22c77c1b011adf84eea0245806
- https://security-tracker.debian.org/tracker/CVE-2018-16882
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16882
- https://nvd.nist.gov/vuln/detail/CVE-2018-16882
- https://ubuntu.com/security/CVE-2018-16882
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