Description
A flaw was found in the way Linux kernel KVM hypervisor before 4.18 emulated instructions such as sgdt/sidt/fxsave/fxrstor. It did not check current privilege(CPL) level while emulating unprivileged instructions. An unprivileged guest user/process could use this flaw to potentially escalate privileges inside guest.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux kernel
4.18affected
References
- https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10853 ↗
- https://usn.ubuntu.com/3777-1/ ↗
- https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html ↗
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=129a72a0d3c8e139a04512325384fe5ac119e74 ↗
- https://lists.debian.org/debian-lts-announce/2018/07/msg00020.html ↗
- https://usn.ubuntu.com/3777-2/ ↗
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3c9fa24ca7c9c47605672916491f79e8ccacb9e6 ↗
- https://www.openwall.com/lists/oss-security/2018/09/02/1 ↗
- http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00043.html ↗
- https://access.redhat.com/errata/RHSA-2019:2043 ↗
- https://access.redhat.com/errata/RHSA-2019:2029 ↗
- https://access.redhat.com/errata/RHSA-2020:0036 ↗
- https://access.redhat.com/errata/RHSA-2020:0103 ↗
- https://access.redhat.com/errata/RHSA-2020:0179 ↗