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Bug 1635475 - (CVE-2018-18021) CVE-2018-18021 kernel: Privilege escalation on arm64 via KVM hypervisor
CVE-2018-18021 kernel: Privilege escalation on arm64 via KVM hypervisor
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20181003,repo...
: Security
Depends On: 1635478 1635721 1637828 1635476 1635477 1637829
Blocks: 1635479
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Reported: 2018-10-02 23:55 EDT by Sam Fowler
Modified: 2018-10-24 11:48 EDT (History)
51 users (show)

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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.
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Description Sam Fowler 2018-10-02 23:55:57 EDT 
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 2018-10-02 23:56:43 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1635476]
Comment 3 Fedora Update System 2018-10-08 23:08:58 EDT 
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 17:54:21 EDT 
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.
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