CWE
416 362
Advisory Published

USN-6221-1: Linux kernel vulnerabilities

First published: Wed Jul 12 2023(Updated: )

It was discovered that a race condition existed in the overlay file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-20321) It was discovered that the virtual terminal (vt) device implementation in the Linux kernel contained a race condition in its ioctl handling that led to an out-of-bounds read vulnerability. A local attacker could possibly use this to expose sensitive information. (CVE-2021-3753) It was discovered that the ext4 file system implementation in the Linux kernel contained a use-after-free vulnerability. An attacker could use this to construct a malicious ext4 file system image that, when mounted, could cause a denial of service (system crash). (CVE-2022-1184) Pawan Kumar Gupta, Alyssa Milburn, Amit Peled, Shani Rehana, Nir Shildan and Ariel Sabba discovered that some Intel processors with Enhanced Indirect Branch Restricted Speculation (eIBRS) did not properly handle RET instructions after a VM exits. A local attacker could potentially use this to expose sensitive information. (CVE-2022-26373) Johannes Wikner and Kaveh Razavi discovered that for some Intel x86-64 processors, the Linux kernel's protections against speculative branch target injection attacks were insufficient in some circumstances. A local attacker could possibly use this to expose sensitive information. (CVE-2022-29901) It was discovered that the ST NCI NFC driver did not properly handle device removal events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2023-1990) It was discovered that the btrfs file system implementation in the Linux kernel did not properly handle error conditions in some situations, leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2023-3111)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-virtual<4.4.0.242.248
4.4.0.242.248
=16.04
All of
ubuntu/linux-image-generic<4.4.0.242.248
4.4.0.242.248
=16.04
All of
ubuntu/linux-image-lowlatency-lts-xenial<4.4.0.242.248
4.4.0.242.248
=16.04
All of
ubuntu/linux-image-aws<4.4.0.1158.162
4.4.0.1158.162
=16.04
All of
ubuntu/linux-image-4.4.0-242-lowlatency<4.4.0-242.276
4.4.0-242.276
=16.04
All of
ubuntu/linux-image-4.4.0-1121-kvm<4.4.0-1121.131
4.4.0-1121.131
=16.04
All of
ubuntu/linux-image-virtual-lts-xenial<4.4.0.242.248
4.4.0.242.248
=16.04
All of
ubuntu/linux-image-generic-lts-xenial<4.4.0.242.248
4.4.0.242.248
=16.04
All of
ubuntu/linux-image-4.4.0-242-generic<4.4.0-242.276
4.4.0-242.276
=16.04
All of
ubuntu/linux-image-4.4.0-1158-aws<4.4.0-1158.173
4.4.0-1158.173
=16.04
All of
ubuntu/linux-image-kvm<4.4.0.1121.118
4.4.0.1121.118
=16.04
All of
ubuntu/linux-image-lowlatency<4.4.0.242.248
4.4.0.242.248
=16.04
All of
ubuntu/linux-image-generic-lts-xenial<4.4.0.242.210
4.4.0.242.210
=14.04
All of
ubuntu/linux-image-4.4.0-242-lowlatency<4.4.0-242.276~14.04.1
4.4.0-242.276~14.04.1
=14.04
All of
ubuntu/linux-image-4.4.0-1120-aws<4.4.0-1120.126
4.4.0-1120.126
=14.04
All of
ubuntu/linux-image-aws<4.4.0.1120.117
4.4.0.1120.117
=14.04
All of
ubuntu/linux-image-4.4.0-242-generic<4.4.0-242.276~14.04.1
4.4.0-242.276~14.04.1
=14.04
All of
ubuntu/linux-image-lowlatency-lts-xenial<4.4.0.242.210
4.4.0.242.210
=14.04
All of
ubuntu/linux-image-virtual-lts-xenial<4.4.0.242.210
4.4.0.242.210
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this Linux kernel vulnerability?

    The vulnerability ID for this Linux kernel vulnerability is CVE-2021-20321.

  • What is the impact of this vulnerability?

    This vulnerability can be exploited by a local attacker to cause a denial of service (system crash).

  • Which software versions are affected by this vulnerability?

    This vulnerability affects Ubuntu versions 16.04 and 14.04 that have the following Linux kernel versions: 4.4.0.242.248, 4.4.0.242.210, 4.4.0-242.276~14.04.1, 4.4.0-242.276, 4.4.0-1120.126, 4.4.0.242.248, 4.4.0.242.248, 4.4.0-242.276~14.04.1, 4.4.0-242.276, 4.4.0-1120.126, 4.4.0.242.248, 4.4.0.242.210, 4.4.0.242.210, 4.4.0.242.210.

  • How can I fix this vulnerability?

    To fix this vulnerability, you need to update the Linux kernel packages to version 4.4.0.242.248 or higher.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability on the Ubuntu security advisory page: [link](https://ubuntu.com/security/CVE-2021-20321).

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