Ubuntu alert USN-8462-1 (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-8462-1] Linux kernel (Oracle) vulnerabilities
Date:
             
 
Mon, 22 Jun 2026 20:19:04 -0300
Message-ID:
             
 
<abdfc581-6c6b-4377-8aab-0b2f27f5ca1c@canonical.com>
Cc:
             
 
Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
==========================================================================
Ubuntu Security Notice USN-8462-1
June 22, 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:

It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)

It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500)

It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a container. (CVE-2026-43503,
CVE-2026-46300)

Qualys discovered that a race condition existed in the ptrace subsystem of
the Linux kernel when privileged processes are exiting. An unprivileged
local attacker could use this issue to expose sensitive information.
(CVE-2026-46333)

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:
   - Cryptographic API;
   - Ethernet bonding driver;
   - Packet sockets;
   - RDS protocol;
   - TLS protocol;
(CVE-2026-31419, CVE-2026-31504, CVE-2026-31533, CVE-2026-43033,
CVE-2026-43077, CVE-2026-43078, CVE-2026-43494, CVE-2026-46028)

Update instructions:

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

Ubuntu 20.04 LTS
   linux-image-5.15.0-1106-oracle  5.15.0-1106.112~20.04.1
                                   Available with Ubuntu Pro
   linux-image-oracle              5.15.0.1106.112~20.04.1
                                   Available with Ubuntu Pro
   linux-image-oracle-5.15         5.15.0.1106.112~20.04.1
                                   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-8462-1
   CVE-2026-31419, CVE-2026-31431, CVE-2026-31504, CVE-2026-31533,
   CVE-2026-43033, CVE-2026-43077, CVE-2026-43078, CVE-2026-43284,
   CVE-2026-43494, CVE-2026-43500, CVE-2026-43503, CVE-2026-46028,
   CVE-2026-46300, CVE-2026-46333



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