CWE
119 416 476 362
Advisory Published

USN-6440-2: Linux kernel (Azure) vulnerabilities

First published: Fri Oct 20 2023(Updated: )

Seth Jenkins discovered that the Linux kernel did not properly perform address randomization for a per-cpu memory management structure. A local attacker could use this to expose sensitive information (kernel memory) or in conjunction with another kernel vulnerability. (CVE-2023-0597) 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-4.15.0-1171-azure<4.15.0-1171.186~14.04.1
4.15.0-1171.186~14.04.1
=14.04
All of
ubuntu/linux-image-azure<4.15.0.1171.137
4.15.0.1171.137
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-6440-2?

    The severity of USN-6440-2 is high.

  • How does the Linux kernel vulnerability (CVE-2023-0597) in USN-6440-2 work?

    The Linux kernel vulnerability (CVE-2023-0597) in USN-6440-2 allows a local attacker to expose sensitive information or exploit it in combination with another kernel vulnerability.

  • Which software versions are affected by USN-6440-2?

    The Linux kernel versions 4.15.0.1171.137 and 4.15.0-1171.186~14.04.1 are affected by USN-6440-2.

  • How do I fix USN-6440-2?

    To fix USN-6440-2, update the Linux kernel to version 4.15.0.1171.137 or 4.15.0-1171.186~14.04.1, depending on the affected version.

  • Where can I find more information about USN-6440-2?

    More information about USN-6440-2 can be found at the following references: [1](https://ubuntu.com/security/CVE-2023-4921), [2](https://ubuntu.com/security/CVE-2023-4622), [3](https://ubuntu.com/security/CVE-2023-42755).

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