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Ubuntu 20.04 LTS Linux Kernel Important Privilege Escalation Fix USN-8439-1

ubuntu
Calendar Grey June 16, 2026
Dist Ubuntu Esm H88
Updates for Ubuntu 20.04 LTS fix kernel security flaws, addressing critical permission issues and potential exploits.
Several security issues were fixed in the Linux kernel.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-oracle-5.15: Linux kernel for Oracle Cloud systems Details: Stonejiajia, Shir Tamari and Sagi Tzadik discovered that the OverlayFS implementation in the Ubuntu Linux kernel did not properly perform permission checks in certain situations. A local attacker could possibly use this to gain elevated privileges. (CVE-2023-2640) Shir Tamari and Sagi Tzadik discovered that the OverlayFS implementation in the Ubuntu Linux kernel did not properly perform permission checks in certain situations. A local attacker could possibly use this to gain elevated privileges. (CVE-2023-32629) 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: - Network drivers; - NVME drivers; -...

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Topics%20covered

Topics Covered

security advisory kernel patch Ubuntu local attack system compromise permission issue

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS linux-image-5.15.0-1104-oracle 5.15.0-1104.110~20.04.1 Available with Ubuntu Pro linux-image-oracle 5.15.0.1104.110~20.04.1 Available with Ubuntu Pro linux-image-oracle-5.15 5.15.0.1104.110~20.04.1 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-8439-1

CVE-2023-2640, CVE-2023-32629, CVE-2024-35862, CVE-2024-50060,

CVE-2026-23112, CVE-2026-23273, CVE-2026-23274, CVE-2026-23351

Severity
critical
Lowest
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Medium
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Critical

Ubuntu Security Notice USN-8439-1

Topics%20covered

Topics Covered

security advisory kernel patch Ubuntu local attack system compromise permission issue

Package Information

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