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Ubuntu 20.04 LTS: USN-7455-5 critical: Linux kernel denial of service

ubuntu
Calendar Grey April 29, 2025
Dist Ubuntu Esm H88
Important Ubuntu Security Update USN-8374-6 highlights various kernel vulnerabilities impacting 22.04 LTS and the corresponding remedial actions.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems

Details:

Jann Horn discovered that the watch_queue event notification subsystem in

the Linux kernel contained an out-of-bounds write vulnerability. A local

attacker could use this to cause a denial of service (system crash) or

escalate their privileges. (CVE-2022-0995)

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:

- iSCSI Boot Firmware Table Attributes driver;

- Network drivers;

- File systems infrastructure;

- NTFS3 file system;

- Ethernet bridge;

- Ethtool driver;

- IPv6 networking;

- Network traffic control;

- VMware vSockets driver;

(CVE-2024-26837, CVE-2025-21993, CVE-2025-21702, CVE-2024-50248,

CVE-2024-46826, CVE-2024-50256, CVE-2025-21703, CVE-2025-21700,

CVE-2025-21756, CVE-2...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service system update ubuntu linux kernel out-of-bounds

Update Instructions

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

Ubuntu 20.04 LTS
  linux-image-5.15.0-1082-aws     5.15.0-1082.89~20.04.1
  linux-image-aws                 5.15.0.1082.89~20.04.1

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-7455-5

https://ubuntu.com/security/notices/USN-7455-4

https://ubuntu.com/security/notices/USN-7455-3

https://ubuntu.com/security/notices/USN-7455-2

https://ubuntu.com/security/notices/USN-7455-1

CVE-2022-0995, CVE-2024-26837, CVE-2024-46826, CVE-2024-50248,

CVE-2024-50256, CVE-2024-56651, CVE-2025-21700, CVE-2025-21701,

CVE-2025-21702, CVE-2025-21703, CVE-2025-21756, CVE-2025-21993

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7455-5

Topics%20covered

Topics Covered

security advisory denial of service system update ubuntu linux kernel out-of-bounds

Package Information

https://launchpad.net/ubuntu/+source/linux-aws-5.15/5.15.0-1082.89~20.04.1

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