1. Ubuntu Security Notices
  2. USN-6536-1

USN-6536-1: Linux kernel vulnerabilities

Publication date

6 December 2023

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Lucas Leong discovered that the netfilter subsystem in the Linux kernel did
not properly validate some attributes passed from userspace. A local
attacker could use this to cause a denial of service (system crash) or
possibly expose sensitive information (kernel memory). (CVE-2023-39189)

Kyle Zeng discovered that the IPv4 implementation in the Linux kernel did
not properly handle socket buffers (skb) when performing IP routing in
certain circumstances, leading to a null pointer dereference vulnerability.
A privileged attacker could use this to cause a denial of service (system
crash). (CVE-2023-42754)

Yikebaer Aizezi discovered that the ext4 file system implementation in the
Linux kernel contained a use-after-free vulnerability when handling inode
extent metadata. An attacker could use this to construct a malicious ext4
file system image that, when...

Lucas Leong discovered that the netfilter subsystem in the Linux kernel did
not properly validate some attributes passed from userspace. A local
attacker could use this to cause a denial of service (system crash) or
possibly expose sensitive information (kernel memory). (CVE-2023-39189)

Kyle Zeng discovered that the IPv4 implementation in the Linux kernel did
not properly handle socket buffers (skb) when performing IP routing in
certain circumstances, leading to a null pointer dereference vulnerability.
A privileged attacker could use this to cause a denial of service (system
crash). (CVE-2023-42754)

Yikebaer Aizezi discovered that the ext4 file system implementation in the
Linux kernel contained a use-after-free vulnerability when handling inode
extent metadata. 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-2023-45898)

Jason Wang discovered that the virtio ring implementation in the Linux
kernel did not properly handle iov buffers in some situations. A local
attacker in a guest VM could use this to cause a denial of service (host
system crash). (CVE-2023-5158)

Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel
did not properly handle queue initialization failures in certain
situations, leading to a use-after-free vulnerability. A remote attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2023-5178)

Budimir Markovic discovered that the perf subsystem in the Linux kernel did
not properly handle event groups, leading to an out-of-bounds write
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-5717)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
23.10 mantic linux-image-6.5.0-1005-starfive –  6.5.0-1005.6
linux-image-6.5.0-1007-laptop –  6.5.0-1007.10
linux-image-6.5.0-1008-raspi –  6.5.0-1008.11
linux-image-6.5.0-1011-aws –  6.5.0-1011.11
linux-image-6.5.0-1013-oracle –  6.5.0-1013.13
linux-image-6.5.0-14-generic –  6.5.0-14.14
linux-image-6.5.0-14-generic-64k –  6.5.0-14.14
linux-image-6.5.0-14-lowlatency –  6.5.0-14.14.1
linux-image-6.5.0-14-lowlatency-64k –  6.5.0-14.14.1
linux-image-aws –  6.5.0.1011.11
linux-image-generic –  6.5.0.14.16
linux-image-generic-64k –  6.5.0.14.16
linux-image-generic-lpae –  6.5.0.14.16
linux-image-kvm –  6.5.0.14.16
linux-image-laptop-23.10 –  6.5.0.1007.10
linux-image-lowlatency –  6.5.0.14.14.12
linux-image-lowlatency-64k –  6.5.0.14.14.12
linux-image-oracle –  6.5.0.1013.13
linux-image-raspi –  6.5.0.1008.9
linux-image-raspi-nolpae –  6.5.0.1008.9
linux-image-starfive –  6.5.0.1005.7
linux-image-virtual –  6.5.0.14.16
22.04 jammy linux-image-6.5.0-1009-oem –  6.5.0-1009.10
linux-image-oem-22.04d –  6.5.0.1009.11

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References

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