Test ID:	1.3.6.1.4.1.25623.1.0.844451
Category:	Ubuntu Local Security Checks
Title:	Ubuntu: Security Advisory (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. 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 https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19377 https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html https://usn.ubuntu.com/4367-1/ https://usn.ubuntu.com/4369-1/ https://usn.ubuntu.com/4414-1/ Common Vulnerability Exposure (CVE) ID: CVE-2020-11565 Debian Security Information: DSA-4667 (Google Search) https://www.debian.org/security/2020/dsa-4667 Debian Security Information: DSA-4698 (Google Search) https://www.debian.org/security/2020/dsa-4698 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=aa9f7d5172fac9bf1f09e678c35e287a40a7b7dd https://github.com/torvalds/linux/commit/aa9f7d5172fac9bf1f09e678c35e287a40a7b7dd https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html https://usn.ubuntu.com/4363-1/ https://usn.ubuntu.com/4364-1/ https://usn.ubuntu.com/4368-1/ Common Vulnerability Exposure (CVE) ID: CVE-2020-12657 https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9 https://github.com/torvalds/linux/commit/2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9 https://patchwork.kernel.org/patch/11447049/ SuSE Security Announcement: openSUSE-SU-2020:0801 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
Copyright	Copyright (C) 2020 Greenbone AG

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