New issue
Advanced search Search tips

Issue 907055 link

Starred by 1 user
Status: WontFix
Owner:
zsm@chromium.org
Closed: Nov 20
Cc:
rkolchmeyer@google.com
wonderfly@google.com
groeck@chromium.org
chromeos-kernel-security-bug-access@google.com
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: ----
Type: Bug-Security



Sign in to add a comment

CVE-2018-10853 CrOS: Vulnerability reported in Linux kernel

Project Member Reported by vomit.go...@appspot.gserviceaccount.com, Nov 20 
VOMIT (go/vomit) has received an external vulnerability report for the Linux kernel. 

Advisory: CVE-2018-10853
  Details: http://vomit.googleplex.com/advisory?id=CVE/CVE-2018-10853
  CVSS severity score: 4.6/10.0
  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.



This bug was filed by http://go/vomit
Please contact us at vomit-team@google.com if you need any assistance.

Comment 1 by zsm@chromium.org, Nov 20

Owner: zsm@chromium.org
Status: Assigned (was: Untriaged)

Comment 2 by zsm@chromium.org, Nov 20

Cc: groeck@chromium.org wonderfly@google.com
Labels: Security_Severity-Medium Security_Impact-None
Upstream patches are :-
- 129a72a0d3c8 ("KVM: x86: Introduce segmented_write_std")
- 3c9fa24ca7c9 ("kvm: x86: use correct privilege level for sgdt/sidt/fxsave/fxrstor access")

These commits are present in chromeos-4.19, v4.14, and v4.4.
Older kernels do not have this commit; as CONFIG_KVM is not enabled on older kernels, marking as WontFix.

Comment 3 by zsm@chromium.org, Nov 20

Status: WontFix (was: Assigned)

Comment 4 by wonderfly@google.com, Nov 20

Cc: rkolchmeyer@google.com
►

Sign in to add a comment