CWE
119 416 476 362
Advisory Published

USN-6440-1: Linux kernel vulnerabilities

First published: Thu Oct 19 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-4.15.0-1125-oracle<4.15.0-1125.136
4.15.0-1125.136
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-1146-kvm<4.15.0-1146.151
4.15.0-1146.151
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-1156-gcp<4.15.0-1156.173
4.15.0-1156.173
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-1162-aws<4.15.0-1162.175
4.15.0-1162.175
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-1171-azure<4.15.0-1171.186
4.15.0-1171.186
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-219-generic<4.15.0-219.230
4.15.0-219.230
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-219-lowlatency<4.15.0-219.230
4.15.0-219.230
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-aws-lts-18.04<4.15.0.1162.160
4.15.0.1162.160
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-azure-lts-18.04<4.15.0.1171.139
4.15.0.1171.139
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-gcp-lts-18.04<4.15.0.1156.170
4.15.0.1156.170
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-generic<4.15.0.219.203
4.15.0.219.203
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-kvm<4.15.0.1146.137
4.15.0.1146.137
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-lowlatency<4.15.0.219.203
4.15.0.219.203
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-oracle-lts-18.04<4.15.0.1125.130
4.15.0.1125.130
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-virtual<4.15.0.219.203
4.15.0.219.203
Ubuntu Ubuntu=18.04
All of
ubuntu/linux-image-4.15.0-1125-oracle<4.15.0-1125.136~16.04.1
4.15.0-1125.136~16.04.1
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-4.15.0-1156-gcp<4.15.0-1156.173~16.04.1
4.15.0-1156.173~16.04.1
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-4.15.0-1171-azure<4.15.0-1171.186~16.04.1
4.15.0-1171.186~16.04.1
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-4.15.0-219-generic<4.15.0-219.230~16.04.1
4.15.0-219.230~16.04.1
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-4.15.0-219-lowlatency<4.15.0-219.230~16.04.1
4.15.0-219.230~16.04.1
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-azure<4.15.0.1171.155
4.15.0.1171.155
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-gcp<4.15.0.1156.146
4.15.0.1156.146
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-generic-hwe-16.04<4.15.0.219.3
4.15.0.219.3
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-gke<4.15.0.1156.146
4.15.0.1156.146
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-lowlatency-hwe-16.04<4.15.0.219.3
4.15.0.219.3
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-oem<4.15.0.219.3
4.15.0.219.3
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-oracle<4.15.0.1125.106
4.15.0.1125.106
Ubuntu Ubuntu=16.04
All of
ubuntu/linux-image-virtual-hwe-16.04<4.15.0.219.3
4.15.0.219.3
Ubuntu Ubuntu=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-6440-1?

    The severity of USN-6440-1 is high.

  • How can a local attacker exploit CVE-2023-0597?

    A local attacker can exploit CVE-2023-0597 to expose sensitive information or in conjunction with another kernel vulnerability.

  • Which versions of Ubuntu are affected by this vulnerability?

    Ubuntu 18.04 and Ubuntu 16.04 are affected by this vulnerability.

  • What is the recommended remedy for this vulnerability?

    The recommended remedy for this vulnerability is to update to the specified versions of the Linux kernel packages.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability on the Ubuntu security website.

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