Race condition in Xen - CVE-2019-17346
Published: March 5, 2019 / Updated: July 28, 2020
Vulnerability identifier: #VU17901
CSH Severity: Low
CVSS v4: 9.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H]
CVE-ID: CVE-2019-17346
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition when processing TLB flushing on PCID-enabled guest system. A local user of guest operating system can crash a hosts system or execute arbitrary code on other guests.
Only x86 systems with at least one PCID-enabled PV guest are vulnerable.
Affected software
Xen
Debian Linux
xen (Alpine package)
xen (Debian package)
Debian Linux
xen (Alpine package)
xen (Debian package)
How to mitigate CVE-2019-17346
Apply patches:
xen (Debian package) - addressed in versions 4.8.5.final+shim4.10.4-1+deb9u12, 4.11.3+24-g14b62ab3e5-1~deb10u1