[USN-8374-1] Linux kernel vulnerabilities
Rodrigo Figueiredo Zaiden
rodrigo.zaiden at canonical.com
Tue Jun 2 18:02:47 UTC 2026
==========================================================================
Ubuntu Security Notice USN-8374-1
June 02, 2026
linux-aws-6.17, linux-gcp, linux-gcp-6.17 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 25.10
- Ubuntu 24.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-aws-6.17: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp-6.17: Linux kernel for Google Cloud Platform (GCP) 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, CVE-2026-45998, CVE-2026-46000)
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)
Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contain a memory leak when handling AppArmor notifications. A local
attacker could use this to cause resource exhaustion. (CVE-2026-47326)
Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contain a NULL pointer dereference when handling AppArmor notifications. A
local attacker could use this to cause a kernel oops. (CVE-2026-47327)
Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained an invalid free when handling AppArmor notifications. A local
attacker could use this to corrupt kernel memory. (CVE-2026-47328)
Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained insufficient validation of AppArmor notification responses. A
local attacker could use this to allow crafted responses to be processed.
(CVE-2026-47329)
Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 used
an uninitialized variable when handling AppArmor notifications. A local
attacker could use this to cause incorrect caching of data.
(CVE-2026-47330)
Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained an out-of-bounds (OOB) read when handling AppArmor notifications.
A local attacker could use this to cause information disclosure of kernel
memory. (CVE-2026-47332)
Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained a out-of-bounds (OOB) read when handling AppArmor notifications.
A local attacker could use this to cause kernel memory corruption and,
theoretically, influence processing of AppArmor policies. (CVE-2026-47333)
Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained incorrect holding of locks when handling AppArmor notifications.
A local attacker could use this to cause a kernel panic or deadlock.
(CVE-2026-47334)
Tristan Madani and Trevor Lawrence have each independently discovered that
Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained a NULL pointer dereference
when handling AppArmor network socket mediation. A local attacker could use
this to cause a kernel oops. (CVE-2026-47337)
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:
- S390 architecture;
- Cryptographic API;
- GPU drivers;
- Ethernet bonding driver;
- Network file system (NFS) server daemon;
- Distributed Switch Architecture;
- Netfilter;
- Control group (cgroup);
- Kernel kexec() syscall;
- Memory management;
- MAC80211 subsystem;
- Multipath TCP;
- Packet sockets;
- RDS protocol;
- RxRPC session sockets;
- TLS protocol;
- Unix domain sockets;
- AppArmor security module;
(CVE-2025-71088, CVE-2025-71090, CVE-2025-71127, CVE-2025-71134,
CVE-2025-71139, CVE-2025-71141, CVE-2025-71142, CVE-2025-71144,
CVE-2025-71152, CVE-2025-71155, CVE-2026-23274, CVE-2026-23351,
CVE-2026-23394, CVE-2026-31419, CVE-2026-31504, CVE-2026-31533,
CVE-2026-31676, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078,
CVE-2026-43494, CVE-2026-45966, CVE-2026-46028)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 25.10
linux-image-6.17.0-1018-gcp 6.17.0-1018.19
linux-image-6.17.0-1018-gcp-64k 6.17.0-1018.19
linux-image-gcp 6.17.0-1018.19
linux-image-gcp-6.17 6.17.0-1018.19
linux-image-gcp-64k 6.17.0-1018.19
linux-image-gcp-64k-6.17 6.17.0-1018.19
Ubuntu 24.04 LTS
linux-image-6.17.0-1017-aws 6.17.0-1017.17~24.04.1
linux-image-6.17.0-1017-aws-64k 6.17.0-1017.17~24.04.1
linux-image-6.17.0-1018-gcp 6.17.0-1018.19~24.04.1
linux-image-6.17.0-1018-gcp-64k 6.17.0-1018.19~24.04.1
linux-image-aws 6.17.0-1017.17~24.04.1
linux-image-aws-6.17 6.17.0-1017.17~24.04.1
linux-image-aws-64k 6.17.0-1017.17~24.04.1
linux-image-aws-64k-6.17 6.17.0-1017.17~24.04.1
linux-image-gcp 6.17.0-1018.19~24.04.1
linux-image-gcp-6.17 6.17.0-1018.19~24.04.1
linux-image-gcp-64k 6.17.0-1018.19~24.04.1
linux-image-gcp-64k-6.17 6.17.0-1018.19~24.04.1
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-8374-1
CVE-2025-71088, CVE-2025-71090, CVE-2025-71127, CVE-2025-71134,
CVE-2025-71139, CVE-2025-71141, CVE-2025-71142, CVE-2025-71144,
CVE-2025-71152, CVE-2025-71155, CVE-2026-23274, CVE-2026-23351,
CVE-2026-23394, CVE-2026-31419, CVE-2026-31431, CVE-2026-31504,
CVE-2026-31533, CVE-2026-31676, CVE-2026-43033, CVE-2026-43077,
CVE-2026-43078, CVE-2026-43284, CVE-2026-43494, CVE-2026-43500,
CVE-2026-43503, CVE-2026-45966, CVE-2026-45998, CVE-2026-46000,
CVE-2026-46028, CVE-2026-46300, CVE-2026-46333, CVE-2026-47326,
CVE-2026-47327, CVE-2026-47328, CVE-2026-47329, CVE-2026-47330,
CVE-2026-47332, CVE-2026-47333, CVE-2026-47334, CVE-2026-47337
Package Information:
https://launchpad.net/ubuntu/+source/linux-gcp/6.17.0-1018.19
https://launchpad.net/ubuntu/+source/linux-aws-6.17/6.17.0-1017.17~24.04.1
https://launchpad.net/ubuntu/+source/linux-gcp-6.17/6.17.0-1018.19~24.04.1
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