CWE
119 416 476 362
Advisory Published

USN-6439-2: Linux kernel (AWS) vulnerabilities

First published: Mon Oct 23 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-4.4.0-1124-aws<4.4.0-1124.130
4.4.0-1124.130
Ubuntu Ubuntu=14.04
All of
ubuntu/linux-image-aws<4.4.0.1124.121
4.4.0.1124.121
Ubuntu Ubuntu=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this advisory?

    The vulnerability ID for this advisory is USN-6439-2.

  • 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.

  • What is the affected software for this vulnerability?

    The affected software for this vulnerability is Ubuntu 14.04 with linux-image-4.4.0-1124-aws (version 4.4.0-1124.130) and linux-image-aws (version 4.4.0.1124.121).

  • How can I fix this vulnerability?

    To fix this vulnerability, update your Ubuntu 14.04 system to the latest linux-image-4.4.0-1124-aws package (version 4.4.0-1124.130) or linux-image-aws package (version 4.4.0.1124.121).

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