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CVE-2018-12893

Status Candidate

Overview

An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users.

Related Files

Gentoo Linux Security Advisory 201810-06
Posted Oct 31, 2018
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201810-6 - Multiple vulnerabilities have been found in Xen, the worst of which could cause a Denial of Service condition. Versions less than 4.10.1-r2 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2017-5715, CVE-2017-5753, CVE-2017-5754, CVE-2018-10471, CVE-2018-10472, CVE-2018-10981, CVE-2018-10982, CVE-2018-12891, CVE-2018-12892, CVE-2018-12893, CVE-2018-15468, CVE-2018-15469, CVE-2018-15470, CVE-2018-3620, CVE-2018-3646, CVE-2018-5244, CVE-2018-7540, CVE-2018-7541, CVE-2018-7542
SHA-256 | b217f9accfba4a764bd6f85c953f7739d90f11d6b6ba34b105c6fadfa4adafee
Debian Security Advisory 4236-1
Posted Jun 29, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4236-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2018-12891, CVE-2018-12892, CVE-2018-12893
SHA-256 | bc38a7c7dcdcd73bd1df565a0d7810fd50d34a4eb9c6c879d0393737aeb23585
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