A Linux kernel security update has been released for Ubuntu Linux 14.04 ESM.

USN-4889-1: Linux kernel vulnerabilities

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Ubuntu Security Notice USN-4889-1
March 25, 2021

linux, linux-lts-xenial vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Adam Nichols discovered that heap overflows existed in the iSCSI subsystem
in the Linux kernel. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2021-27365)

Adam Nichols discovered that the iSCSI subsystem in the Linux kernel did
not properly restrict access to iSCSI transport handles. A local attacker
could use this to cause a denial of service or expose sensitive information
(kernel pointer addresses). (CVE-2021-27363)

Adam Nichols discovered that an out-of-bounds read existed in the iSCSI
subsystem in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or expose sensitive information (kernel
memory). (CVE-2021-27364)

Update instructions:

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

Ubuntu 14.04 ESM:
linux-image-3.13.0-185-generic 3.13.0-185.236
linux-image-3.13.0-185-generic-lpae 3.13.0-185.236
linux-image-3.13.0-185-lowlatency 3.13.0-185.236
linux-image-4.4.0-206-generic 4.4.0-206.238~14.04.1
linux-image-4.4.0-206-generic-lpae 4.4.0-206.238~14.04.1
linux-image-4.4.0-206-lowlatency 4.4.0-206.238~14.04.1
linux-image-generic 3.13.0.185.194
linux-image-generic-lpae 3.13.0.185.194
linux-image-generic-lpae-lts-xenial 4.4.0.206.179
linux-image-generic-lts-xenial 4.4.0.206.179
linux-image-generic-pae 3.13.0.185.194
linux-image-lowlatency 3.13.0.185.194
linux-image-lowlatency-lts-xenial 4.4.0.206.179
linux-image-lowlatency-pae 3.13.0.185.194
linux-image-server 3.13.0.185.194
linux-image-virtual 3.13.0.185.194
linux-image-virtual-lts-xenial 4.4.0.206.179

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-4889-1
CVE-2021-27363, CVE-2021-27364, CVE-2021-27365

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