Use-after-free error in Linux kernel - CVE-2018-16882
Published: December 19, 2018
Vulnerability identifier: #VU16617
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-16882
CWE-ID: CWE-416
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows an adjacent attacker to cause DoS condition or gain elevated privileges on the target system.
The vulnerability exists due to 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 latter used in pi_test_and_clear_on(). An adjacent attacker can use a malicious container to trigger use-after-free error and crash the host kernel resulting in DoS OR potentially gain privileged access to a system.
How to mitigate CVE-2018-16882
Install update from vendor's website.