Bug 1635475 (CVE-2018-18021) - CVE-2018-18021 kernel: Privilege escalation on arm64 via KVM hypervisor
Summary: CVE-2018-18021 kernel: Privilege escalation on arm64 via KVM hypervisor
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-18021
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1635476 1635477 1635478 1635721 1637828 1637829
Blocks: 1635479
TreeView+ depends on / blocked
 
Reported: 2018-10-03 03:55 UTC by Sam Fowler
Modified: 2021-12-10 17:45 UTC (History)
50 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was discovered in the Linux kernel that allows an attacker to escalate privileges with using a 64-bit ARM architecture. A local attacker with permission to create KVM-based virtual machines can both panic the hypervisor by triggering an illegal exception return (resulting in a DoS) and to redirect execution elsewhere within the hypervisor with full register control, instead of causing a return to the guest.
Clone Of:
Environment:
Last Closed: 2019-06-10 10:39:01 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:3656 0 None None None 2018-11-26 23:14:53 UTC

Description Sam Fowler 2018-10-03 03:55:57 UTC 
The Linux kernel has vulnerability on 64-bit ARM architectures that allows an attacker to escalate privileges. A local attacker with permission to create KVM-based virtual machines can both panic the hypervisor by triggering an illegal exception return (resulting in a DoS) and to redirect execution elsewhere within the hypervisor with full register control, instead of causing a return to the guest.


Reference:

https://www.openwall.com/lists/oss-security/2018/10/02/2


Proposed Upstream Patches:

https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/commit/?id=d26c25a9
https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/commit/?id=2a3f9345
Comment 1 Sam Fowler 2018-10-03 03:56:43 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1635476]
Comment 3 Fedora Update System 2018-10-09 03:08:58 UTC 
kernel-4.18.12-200.fc28, kernel-headers-4.18.12-200.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2018-10-10 21:54:21 UTC 
kernel-4.18.12-100.fc27, kernel-headers-4.18.12-100.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.
Comment 8 errata-xmlrpc 2018-11-26 23:14:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3656 https://access.redhat.com/errata/RHSA-2018:3656
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