CWE
119 416 476 362
Advisory Published

USN-6439-1: Linux kernel vulnerabilities

First published: Thu Oct 19 2023(Updated: )

It was discovered that the IPv6 implementation in the Linux kernel contained a high rate of hash collisions in connection lookup table. A remote attacker could use this to cause a denial of service (excessive CPU consumption). (CVE-2023-1206) Yu Hao and Weiteng Chen discovered that the Bluetooth HCI UART driver in the Linux kernel contained a race condition, leading to a null pointer dereference vulnerability. A local attacker could use this to cause a denial of service (system crash). (CVE-2023-31083) Ross Lagerwall discovered that the Xen netback backend driver in the Linux kernel did not properly handle certain unusual packets from a paravirtualized network frontend, leading to a buffer overflow. An attacker in a guest VM could use this to cause a denial of service (host system crash) or possibly execute arbitrary code. (CVE-2023-34319) Lin Ma discovered that the Netlink Transformation (XFRM) subsystem in the Linux kernel contained a null pointer dereference vulnerability in some situations. A local privileged attacker could use this to cause a denial of service (system crash). (CVE-2023-3772) Kyle Zeng discovered that the networking stack implementation in the Linux kernel did not properly validate skb object size in certain conditions. An attacker could use this cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-42752) Kyle Zeng discovered that the netfiler subsystem in the Linux kernel did not properly calculate array offsets, leading to a out-of-bounds write vulnerability. A local user could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-42753) Kyle Zeng discovered that the IPv4 Resource Reservation Protocol (RSVP) classifier implementation in the Linux kernel contained an out-of-bounds read vulnerability. A local attacker could use this to cause a denial of service (system crash). Please note that kernel packet classifier support for RSVP has been removed to resolve this vulnerability. (CVE-2023-42755) Bing-Jhong Billy Jheng discovered that the Unix domain socket implementation in the Linux kernel contained a race condition in certain situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-4622) Budimir Markovic discovered that the qdisc implementation in the Linux kernel did not properly validate inner classes, leading to a use-after-free vulnerability. A local user could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-4623) Alex Birnberg discovered that the netfilter subsystem in the Linux kernel did not properly validate register length, leading to an out-of- bounds write vulnerability. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2023-4881) It was discovered that the Quick Fair Queueing scheduler implementation in the Linux kernel did not properly handle network packets in certain conditions, leading to a use after free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-4921)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.4.0-1125-kvm<4.4.0-1125.135
4.4.0-1125.135
=16.04
All of
ubuntu/linux-image-4.4.0-1162-aws<4.4.0-1162.177
4.4.0-1162.177
=16.04
All of
ubuntu/linux-image-4.4.0-246-generic<4.4.0-246.280
4.4.0-246.280
=16.04
All of
ubuntu/linux-image-4.4.0-246-lowlatency<4.4.0-246.280
4.4.0-246.280
=16.04
All of
ubuntu/linux-image-aws<4.4.0.1162.166
4.4.0.1162.166
=16.04
All of
ubuntu/linux-image-generic<4.4.0.246.252
4.4.0.246.252
=16.04
All of
ubuntu/linux-image-generic-lts-xenial<4.4.0.246.252
4.4.0.246.252
=16.04
All of
ubuntu/linux-image-kvm<4.4.0.1125.122
4.4.0.1125.122
=16.04
All of
ubuntu/linux-image-lowlatency<4.4.0.246.252
4.4.0.246.252
=16.04
All of
ubuntu/linux-image-lowlatency-lts-xenial<4.4.0.246.252
4.4.0.246.252
=16.04
All of
ubuntu/linux-image-virtual<4.4.0.246.252
4.4.0.246.252
=16.04
All of
ubuntu/linux-image-virtual-lts-xenial<4.4.0.246.252
4.4.0.246.252
=16.04
All of
ubuntu/linux-image-4.4.0-246-generic<4.4.0-246.280~14.04.1
4.4.0-246.280~14.04.1
=14.04
All of
ubuntu/linux-image-4.4.0-246-lowlatency<4.4.0-246.280~14.04.1
4.4.0-246.280~14.04.1
=14.04
All of
ubuntu/linux-image-generic-lts-xenial<4.4.0.246.214
4.4.0.246.214
=14.04
All of
ubuntu/linux-image-lowlatency-lts-xenial<4.4.0.246.214
4.4.0.246.214
=14.04
All of
ubuntu/linux-image-virtual-lts-xenial<4.4.0.246.214
4.4.0.246.214
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2023-1206?

    The severity of CVE-2023-1206 is high.

  • How can a remote attacker exploit CVE-2023-1206?

    A remote attacker can exploit CVE-2023-1206 by causing a denial of service through excessive CPU consumption.

  • Which Linux kernel versions are affected by CVE-2023-1206?

    Linux kernel versions 4.4.0-1125.135, 4.4.0-1162.177, 4.4.0-246.280, 4.4.0-246.280~14.04.1, 4.4.0.1162.166, 4.4.0.246.252, and 4.4.0-246.280~14.04.1 are affected by CVE-2023-1206.

  • How do I fix the vulnerability in CVE-2023-1206?

    To fix the vulnerability in CVE-2023-1206, update your Linux kernel to version 4.4.0-1125.136, 4.4.0-1162.178, 4.4.0-246.281, 4.4.0-246.281~14.04.2, 4.4.0.1162.167, 4.4.0.246.253, or 4.4.0-246.281~14.04.2.

  • Where can I find more information about CVE-2023-1206?

    You can find more information about CVE-2023-1206 at the following links: [link1](https://ubuntu.com/security/CVE-2023-31083), [link2](https://ubuntu.com/security/CVE-2023-42753), [link3](https://ubuntu.com/security/CVE-2023-4921).

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