Debian Security Advisory DSA 4196-1 (linux - security update)

Published: 2018-05-07 22:00:00
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

Affected Versions:
linux on Debian Linux

Recommendations:
For the oldstable distribution (jessie), these problems have been fixed in version 3.16.56-1+deb8u1. This update includes various fixes for regressions from 3.16.56-1 as released in DSA-4187-1 (Cf. #897427, #898067 and #898100). For the stable distribution (stretch), these problems have been fixed in version 4.9.88-1+deb9u1. The fix for CVE-2018-1108 applied in DSA-4188-1 is temporarily reverted due to various regression, cf. #897599. We recommend that you upgrade your linux Linux Distribution Packages. For the detailed security status of linux please refer to its security tracker page linked in the references.

Summary:
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation or denial of service. CVE-2018-1087 Andy Lutomirski discovered that the KVM implementation did not properly handle #DB exceptions while deferred by MOV SS/POP SS, allowing an unprivileged KVM guest user to crash the guest or potentially escalate their privileges. CVE-2018-8897 Nick Peterson of Everdox Tech LLC discovered that #DB exceptions that are deferred by MOV SS or POP SS are not properly handled, allowing an unprivileged user to crash the kernel and cause a denial of service.

Detection Method:
This check tests the installed software version using the apt Linux Distribution Package manager.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2018-1087
https://nvd.nist.gov/vuln/detail/CVE-2018-8897

References:

https://www.debian.org/security/2018/dsa-4196.html
https://security-tracker.debian.org/tracker/linux

Severity
High
CVSS Score
7.2
Published
2018-05-07
Modified
2019-03-18
Category
Debian Local Security Checks

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