Ubuntu alert USN-8439-1 (linux-oracle-5.15)

From:
             
 
Rodrigo Figueiredo Zaiden via ubuntu-security-announce <ubuntu-security-announce@lists.ubuntu.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8439-1] Linux kernel (Oracle) vulnerabilities
Date:
             
 
Tue, 16 Jun 2026 17:02:27 -0300
Message-ID:
             
 
<3a0bbee1-9b06-4c40-9e2b-1bfdb77d0f1f@canonical.com>
Cc:
             
 
Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
==========================================================================
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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