Description
A flaw was found in Linux kernel's KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host's userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu variables. An attacker can use this to escalate their privileges.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
[UNKNOWN] kernel:
n/aaffected
References
- http://www.securityfocus.com/bid/104905 ↗
- https://access.redhat.com/errata/RHSA-2018:2393 ↗
- https://access.redhat.com/errata/RHSA-2018:2390 ↗
- https://access.redhat.com/errata/RHSA-2018:2391 ↗
- https://access.redhat.com/errata/RHSA-2018:2392 ↗
- https://access.redhat.com/errata/RHSA-2018:2394 ↗
- https://www.oracle.com/security-alerts/cpujul2020.html ↗
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html ↗
- https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0 ↗
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3444d7da1839b851eefedd372978d8a982316c36 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10901 ↗