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Debian: Security Advisory for linux (DSA-4667-1)

Information

Severity

Severity

Medium

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

5.4

CVSSv2 Vector

CVSSv2 Vector

AV:L/AC:M/Au:N/C:N/I:P/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

2 years ago

Modified

Modified

2 years ago

Summary

The remote host is missing an update for the 'linux' package(s) announced via the DSA-4667-1 advisory.

Insight

Insight

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service, or information leak. CVE-2020-2732 Paulo Bonzini discovered that the KVM implementation for Intel processors did not properly handle instruction emulation for L2 guests when nested virtualization is enabled. This could allow an L2 guest to cause privilege escalation, denial of service, or information leaks in the L1 guest. CVE-2020-8428 Al Viro discovered a use-after-free vulnerability in the VFS layer. This allowed local users to cause a denial-of-service (crash) or obtain sensitive information from kernel memory. CVE-2020-10942 It was discovered that the vhost_net driver did not properly validate the type of sockets set as back-ends. A local user permitted to access /dev/vhost-net could use this to cause a stack corruption via crafted system calls, resulting in denial of service (crash) or possibly privilege escalation. CVE-2020-11565 Entropy Moe reported that the shared memory filesystem (tmpfs) did not correctly handle an mpol mount option specifying an empty node list, leading to a stack-based out-of-bounds write. If user namespaces are enabled, a local user could use this to cause a denial of service (crash) or possibly for privilege escalation. CVE-2020-11884 Al Viro reported a race condition in memory management code for IBM Z (s390x architecture), that can result in the kernel executing code from the user address space. A local user could use this for privilege escalation.

Affected Software

Affected Software

'linux' package(s) on Debian Linux.

Detection Method

Detection Method

Checks if a vulnerable package version is present on the target host.

Solution

Solution

For the stable distribution (buster), these problems have been fixed in version 4.19.98-1+deb10u1. We recommend that you upgrade your linux packages.

Common Vulnerabilities and Exposures (CVE)