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Ubuntu Security Notice USN-6973-2
August 23, 2024

linux-azure-5.4 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems

Details:

It was discovered that a race condition existed in the Bluetooth subsystem
in the Linux kernel, leading to a null pointer dereference vulnerability. A
privileged local attacker could use this to possibly cause a denial of
service (system crash). (CVE-2024-24860)

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
   - SuperH RISC architecture;
   - MMC subsystem;
   - Network drivers;
   - SCSI drivers;
   - GFS2 file system;
   - IPv4 networking;
   - IPv6 networking;
   - HD-audio driver;
(CVE-2024-26830, CVE-2024-39484, CVE-2024-36901, CVE-2024-26929,
CVE-2024-26921, CVE-2021-46926, CVE-2023-52629, CVE-2023-52760)

Update instructions:

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

Ubuntu 18.04 LTS
   linux-image-5.4.0-1136-azure    5.4.0-1136.143~18.04.1
                                   Available with Ubuntu Pro
   linux-image-azure               5.4.0.1136.143~18.04.1
                                   Available with Ubuntu Pro

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-6973-2
   https://ubuntu.com/security/notices/USN-6973-1
   CVE-2021-46926, CVE-2023-52629, CVE-2023-52760, CVE-2024-24860,
   CVE-2024-26830, CVE-2024-26921, CVE-2024-26929, CVE-2024-36901,
   CVE-2024-39484