[USN-6388-1] Linux kernel vulnerabilities
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Ubuntu Security Notice USN-6388-1
September 19, 2023
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm: Linux kernel for cloud environments
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
Details:
Daniel Moghimi discovered that some Intel(R) Processors did not properly
clear microarchitectural state after speculative execution of various
instructions. A local unprivileged user could use this to obtain to
sensitive information. (CVE-2022-40982)
Yang Lan discovered that the GFS2 file system implementation in the Linux
kernel could attempt to dereference a null pointer in some situations. An
attacker could use this to construct a malicious GFS2 image that, when
mounted and operated on, could cause a denial of service (system crash).
(CVE-2023-3212)
It was discovered that the NET/ROM protocol implementation in the Linux
kernel contained a race condition in some 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-2023-32269)
It was discovered that the NFC implementation in the Linux kernel contained
a use-after-free vulnerability when performing peer-to-peer communication
in certain conditions. A privileged attacker could use this to cause a
denial of service (system crash) or possibly expose sensitive information
(kernel memory). (CVE-2023-3863)
It was discovered that the bluetooth subsystem in the Linux kernel did not
properly handle L2CAP socket release, 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-2023-40283)
It was discovered that some network classifier implementations in the Linux
kernel contained use-after-free vulnerabilities. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2023-4128)
It was discovered that the JFS file system implementation in the Linux
kernel did not properly validate memory allocations in certain situations,
leading to a null pointer dereference vulnerability. An attacker could use
this to construct a malicious JFS image that, when mounted, could cause a
denial of service (system crash). (CVE-2023-4385)
It was discovered that the VMware VMXNET3 ethernet driver in the Linux
kernel contained a use-after-free vulnerability in certain situations. A
local attacker in a guest VM could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-4387)
It was discovered that the VMware VMXNET3 ethernet driver in the Linux
kernel did not properly handle errors in certain situations, leading to a
null pointer dereference vulnerability. A local attacker in a guest VM
could use this to cause a denial of service (system crash). (CVE-2023-4459)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS (Available with Ubuntu Pro):
linux-image-4.4.0-1124-kvm 4.4.0-1124.134
linux-image-4.4.0-1161-aws 4.4.0-1161.176
linux-image-4.4.0-245-generic 4.4.0-245.279
linux-image-4.4.0-245-lowlatency 4.4.0-245.279
linux-image-aws 4.4.0.1161.165
linux-image-generic 4.4.0.245.251
linux-image-generic-lts-xenial 4.4.0.245.251
linux-image-kvm 4.4.0.1124.121
linux-image-lowlatency 4.4.0.245.251
linux-image-lowlatency-lts-xenial 4.4.0.245.251
linux-image-virtual 4.4.0.245.251
linux-image-virtual-lts-xenial 4.4.0.245.251
Ubuntu 14.04 LTS (Available with Ubuntu Pro):
linux-image-4.4.0-1123-aws 4.4.0-1123.129
linux-image-4.4.0-245-generic 4.4.0-245.279~14.04.1
linux-image-4.4.0-245-lowlatency 4.4.0-245.279~14.04.1
linux-image-aws 4.4.0.1123.120
linux-image-generic-lts-xenial 4.4.0.245.213
linux-image-lowlatency-lts-xenial 4.4.0.245.213
linux-image-virtual-lts-xenial 4.4.0.245.213
After a standard system update you need to reboot your computer to make
all the necessary changes.
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.
References:
https://ubuntu.com/security/notices/USN-6388-1
CVE-2022-40982, CVE-2023-3212, CVE-2023-32269, CVE-2023-3863,
CVE-2023-40283, CVE-2023-4128, CVE-2023-4385, CVE-2023-4387,
CVE-2023-4459
A Linux kernel security update has been released for Ubuntu Linux 14.04 LTS and 16.04 LTS.
