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Test ID:1.3.6.1.4.1.25623.1.0.844451
Category:Ubuntu Local Security Checks
Title:Ubuntu: Security Advisory for linux (USN-4367-2)
Summary:The remote host is missing an update for the 'linux'; package(s) announced via the USN-4367-2 advisory.
Description:Summary:
The remote host is missing an update for the 'linux'
package(s) announced via the USN-4367-2 advisory.

Vulnerability Insight:
USN-4367-1 fixed vulnerabilities in the 5.4 Linux kernel. Unfortunately,
that update introduced a regression in overlayfs. This update corrects
the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that the btrfs implementation in the Linux kernel did not
properly detect that a block was marked dirty in some situations. An
attacker could use this to specially craft a file system image that, when
unmounted, could cause a denial of service (system crash). (CVE-2019-19377)

It was discovered that the linux kernel did not properly validate certain
mount options to the tmpfs virtual memory file system. A local attacker
with the ability to specify mount options could use this to cause a denial
of service (system crash). (CVE-2020-11565)

It was discovered that the block layer in the Linux kernel contained a race
condition leading to a use-after-free vulnerability. A local attacker could
possibly use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2020-12657)

Affected Software/OS:
'linux' package(s) on Ubuntu 20.04 LTS.

Solution:
Please install the updated package(s).

CVSS Score:
6.8

CVSS Vector:
AV:N/AC:M/Au:N/C:P/I:P/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2019-19377
Common Vulnerability Exposure (CVE) ID: CVE-2020-11565
Common Vulnerability Exposure (CVE) ID: CVE-2020-12657
CopyrightCopyright (C) 2020 Greenbone Networks GmbH

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