========================================================================== Ubuntu Security Notice USN-8439-1 June 16, 2026
linux-oracle-5.15 vulnerabilities
==========================================================================
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;
- SMB network file system;
- Netfilter;
- io_uring subsystem;
(CVE-2024-35862, CVE-2024-50060, CVE-2026-23112, CVE-2026-23273,
CVE-2026-23274, CVE-2026-23351)
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
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