Home / mailings [USN-8255-1] Linux kernel vulnerabilities
Posted on 07 May 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8255-1
May 07, 2026
linux, linux-aws, linux-aws-5.15, linux-aws-fips, linux-azure,
linux-azure-fips, linux-fips, linux-gcp, linux-gcp-fips, linux-gke,
linux-gkeop, linux-hwe-5.15, linux-ibm, linux-ibm-5.15,
linux-intel-iot-realtime, linux-intel-iotg, linux-intel-iotg-5.15,
linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia,
linux-nvidia-tegra, linux-nvidia-tegra-igx, linux-oracle, linux-realtime
vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS
- linux-fips: Linux kernel with FIPS
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) systems with FIPS
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-intel-iot-realtime: Linux kernel for Intel IoT Real-time platforms
- linux-intel-iotg: Linux kernel for Intel IoT platforms
- linux-kvm: Linux kernel for cloud environments
- linux-lowlatency: Linux low latency kernel
- linux-nvidia: Linux kernel for NVIDIA systems
- linux-nvidia-tegra: Linux kernel for NVIDIA Tegra systems
- linux-nvidia-tegra-igx: Linux kernel for NVIDIA Tegra IGX systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-realtime: Linux kernel for Real-time systems
- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel
- linux-ibm-5.15: Linux kernel for IBM cloud systems
- linux-intel-iotg-5.15: Linux kernel for Intel IoT platforms
- linux-lowlatency-hwe-5.15: Linux low latency kernel
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;
(CVE-2026-23112, CVE-2026-23273)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS
linux-image-5.15.0-1047-nvidia-tegra-igx 5.15.0-1047.47
linux-image-5.15.0-1047-nvidia-tegra-igx-rt 5.15.0-1047.47
linux-image-5.15.0-1058-nvidia-tegra 5.15.0-1058.58
linux-image-5.15.0-1058-nvidia-tegra-rt 5.15.0-1058.58
linux-image-5.15.0-1089-gkeop 5.15.0-1089.97
linux-image-5.15.0-1098-intel-iot-realtime 5.15.0-1098.100
Available with Ubuntu Pro
linux-image-5.15.0-1098-kvm 5.15.0-1098.103
linux-image-5.15.0-1100-ibm 5.15.0-1100.103
linux-image-5.15.0-1101-intel-iotg 5.15.0-1101.107
linux-image-5.15.0-1101-nvidia 5.15.0-1101.102
linux-image-5.15.0-1101-nvidia-lowlatency 5.15.0-1101.102
linux-image-5.15.0-1102-gke 5.15.0-1102.108
linux-image-5.15.0-1103-oracle 5.15.0-1103.109
linux-image-5.15.0-1105-realtime 5.15.0-1105.114
Available with Ubuntu Pro
linux-image-5.15.0-1106-aws 5.15.0-1106.113
linux-image-5.15.0-1106-aws-64k 5.15.0-1106.113
linux-image-5.15.0-1106-aws-fips 5.15.0-1106.113+fips1
Available with Ubuntu Pro
linux-image-5.15.0-1106-gcp 5.15.0-1106.115
linux-image-5.15.0-1106-gcp-fips 5.15.0-1106.115+fips1
Available with Ubuntu Pro
linux-image-5.15.0-1111-azure 5.15.0-1111.120
linux-image-5.15.0-1111-azure-fips 5.15.0-1111.120+fips1
Available with Ubuntu Pro
linux-image-5.15.0-177-fips 5.15.0-177.187+fips1
Available with Ubuntu Pro
linux-image-5.15.0-177-generic 5.15.0-177.187
linux-image-5.15.0-177-generic-64k 5.15.0-177.187
linux-image-5.15.0-177-generic-lpae 5.15.0-177.187
linux-image-5.15.0-177-lowlatency 5.15.0-177.187
linux-image-5.15.0-177-lowlatency-64k 5.15.0-177.187
linux-image-aws-5.15 5.15.0.1106.109
linux-image-aws-64k-5.15 5.15.0.1106.109
linux-image-aws-64k-lts-22.04 5.15.0.1106.109
linux-image-aws-fips 5.15.0.1106.102
Available with Ubuntu Pro
linux-image-aws-fips-5.15 5.15.0.1106.102
Available with Ubuntu Pro
linux-image-aws-lts-22.04 5.15.0.1106.109
linux-image-azure-5.15 5.15.0.1111.109
linux-image-azure-fips 5.15.0.1111.96
Available with Ubuntu Pro
linux-image-azure-fips-5.15 5.15.0.1111.96
Available with Ubuntu Pro
linux-image-azure-lts-22.04 5.15.0.1111.109
linux-image-fips 5.15.0.177.103
Available with Ubuntu Pro
linux-image-fips-5.15 5.15.0.177.103
Available with Ubuntu Pro
linux-image-gcp-5.15 5.15.0.1106.102
linux-image-gcp-fips 5.15.0.1106.96
Available with Ubuntu Pro
linux-image-gcp-fips-5.15 5.15.0.1106.96
Available with Ubuntu Pro
linux-image-gcp-lts-22.04 5.15.0.1106.102
linux-image-generic 5.15.0.177.162
linux-image-generic-5.15 5.15.0.177.162
linux-image-generic-64k 5.15.0.177.162
linux-image-generic-64k-5.15 5.15.0.177.162
linux-image-generic-lpae 5.15.0.177.162
linux-image-generic-lpae-5.15 5.15.0.177.162
linux-image-gke 5.15.0.1102.101
linux-image-gke-5.15 5.15.0.1102.101
linux-image-gkeop 5.15.0.1089.88
linux-image-gkeop-5.15 5.15.0.1089.88
linux-image-ibm 5.15.0.1100.96
linux-image-ibm-5.15 5.15.0.1100.96
linux-image-intel-iot-realtime 5.15.0.1098.102
Available with Ubuntu Pro
linux-image-intel-iot-realtime-5.15 5.15.0.1098.102
Available with Ubuntu Pro
linux-image-intel-iotg 5.15.0.1101.100
linux-image-intel-iotg-5.15 5.15.0.1101.100
linux-image-kvm 5.15.0.1098.94
linux-image-kvm-5.15 5.15.0.1098.94
linux-image-lowlatency 5.15.0.177.149
linux-image-lowlatency-5.15 5.15.0.177.149
linux-image-lowlatency-64k 5.15.0.177.149
linux-image-lowlatency-64k-5.15 5.15.0.177.149
linux-image-nvidia 5.15.0.1101.101
linux-image-nvidia-5.15 5.15.0.1101.101
linux-image-nvidia-lowlatency 5.15.0.1101.101
linux-image-nvidia-lowlatency-5.15 5.15.0.1101.101
linux-image-nvidia-tegra 5.15.0.1058.58
linux-image-nvidia-tegra-5.15 5.15.0.1058.58
linux-image-nvidia-tegra-igx 5.15.0.1047.49
linux-image-nvidia-tegra-igx-5.15 5.15.0.1047.49
linux-image-nvidia-tegra-igx-rt 5.15.0.1047.49
linux-image-nvidia-tegra-igx-rt-5.15 5.15.0.1047.49
linux-image-nvidia-tegra-rt 5.15.0.1058.58
linux-image-nvidia-tegra-rt-5.15 5.15.0.1058.58
linux-image-oracle-5.15 5.15.0.1103.99
linux-image-oracle-lts-22.04 5.15.0.1103.99
linux-image-realtime 5.15.0.1105.109
Available with Ubuntu Pro
linux-image-realtime-5.15 5.15.0.1105.109
Available with Ubuntu Pro
linux-image-virtual 5.15.0.177.162
linux-image-virtual-5.15 5.15.0.177.162
Ubuntu 20.04 LTS
linux-image-5.15.0-1100-ibm 5.15.0-1100.103~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1101-intel-iotg 5.15.0-1101.107~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-1106-aws 5.15.0-1106.113~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-177-generic 5.15.0-177.187~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-177-generic-64k 5.15.0-177.187~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-177-generic-lpae 5.15.0-177.187~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-177-lowlatency 5.15.0-177.187~20.04.1
Available with Ubuntu Pro
linux-image-5.15.0-177-lowlatency-64k 5.15.0-177.187~20.04.1
Available with Ubuntu Pro
linux-image-aws 5.15.0.1106.113~20.04.1
Available with Ubuntu Pro
linux-image-aws-5.15 5.15.0.1106.113~20.04.1
Available with Ubuntu Pro
linux-image-generic-5.15 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-generic-64k-5.15 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-generic-64k-hwe-20.04 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-generic-hwe-20.04 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-generic-lpae-5.15 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-generic-lpae-hwe-20.04 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-ibm 5.15.0.1100.103~20.04.1
Available with Ubuntu Pro
linux-image-ibm-5.15 5.15.0.1100.103~20.04.1
Available with Ubuntu Pro
linux-image-intel 5.15.0.1101.107~20.04.1
Available with Ubuntu Pro
linux-image-intel-iotg 5.15.0.1101.107~20.04.1
Available with Ubuntu Pro
linux-image-intel-iotg-5.15 5.15.0.1101.107~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-5.15 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-64k-5.15 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-64k-hwe-20.04 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-lowlatency-hwe-20.04 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04b 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04c 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-oem-20.04d 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-virtual-5.15 5.15.0.177.187~20.04.1
Available with Ubuntu Pro
linux-image-virtual-hwe-20.04 5.15.0.177.187~20.04.1
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-8255-1
CVE-2023-2640, CVE-2023-32629, CVE-2026-23112, CVE-2026-23273
Package Information:
https://launchpad.net/ubuntu/+source/linux/5.15.0-177.187
https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-1106.113
https://launchpad.net/ubuntu/+source/linux-aws-fips/5.15.0-1106.113+fips1
https://launchpad.net/ubuntu/+source/linux-azure/5.15.0-1111.120
https://launchpad.net/ubuntu/+source/linux-azure-fips/5.15.0-1111.120+fips1
https://launchpad.net/ubuntu/+source/linux-fips/5.15.0-177.187+fips1
https://launchpad.net/ubuntu/+source/linux-gcp/5.15.0-1106.115
https://launchpad.net/ubuntu/+source/linux-gcp-fips/5.15.0-1106.115+fips1
https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1102.108
https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1089.97
https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1100.103
https://launchpad.net/ubuntu/+source/linux-intel-iot-realtime/5.15.0-1098.100
https://launchpad.net/ubuntu/+source/linux-intel-iotg/5.15.0-1101.107
https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1098.103
https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-177.187
https://launchpad.net/ubuntu/+source/linux-nvidia/5.15.0-1101.102
https://launchpad.net/ubuntu/+source/linux-nvidia-tegra/5.15.0-1058.58
https://launchpad.net/ubuntu/+source/linux-nvidia-tegra-igx/5.15.0-1047.47
https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-1103.109
https://launchpad.net/ubuntu/+source/linux-realtime/5.15.0-1105.114
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