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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 0.36% probability · 29th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel · canonical/ubuntu linux
- Source
- secalert@redhat.com
References
- http://www.securityfocus.com/bid/106254Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16882Issue Tracking, Patch, Third Party Advisory
- https://lwn.net/Articles/775720/Third Party Advisory
- https://lwn.net/Articles/775721/Third Party Advisory
- https://marc.info/?l=kvm&m=154514994222809&w=2Patch, Third Party Advisory
- https://support.f5.com/csp/article/K80557033Third Party Advisory
- https://usn.ubuntu.com/3871-1/Third Party Advisory
- https://usn.ubuntu.com/3871-3/Third Party Advisory
- https://usn.ubuntu.com/3871-4/Third Party Advisory
- https://usn.ubuntu.com/3871-5/Third Party Advisory
- https://usn.ubuntu.com/3872-1/Third Party Advisory
- https://usn.ubuntu.com/3878-1/Third Party Advisory
- https://usn.ubuntu.com/3878-2/Third Party Advisory
- http://www.securityfocus.com/bid/106254Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16882Issue Tracking, Patch, Third Party Advisory
- https://lwn.net/Articles/775720/Third Party Advisory
- https://lwn.net/Articles/775721/Third Party Advisory
- https://marc.info/?l=kvm&m=154514994222809&w=2Patch, Third Party Advisory
- https://support.f5.com/csp/article/K80557033Third Party Advisory
- https://usn.ubuntu.com/3871-1/Third Party Advisory
- https://usn.ubuntu.com/3871-3/Third Party Advisory
- https://usn.ubuntu.com/3871-4/Third Party Advisory
- https://usn.ubuntu.com/3871-5/Third Party Advisory
- https://usn.ubuntu.com/3872-1/Third Party Advisory
- https://usn.ubuntu.com/3878-1/Third Party Advisory
- https://usn.ubuntu.com/3878-2/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.