Ubuntu alert USN-8388-1 (linux, linux-aws, linux-aws-5.15, linux-aws-fips, linux-fips, linux-gcp, linux-gcp-5.15, 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-kvm, linux-nvidia, linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx, linux-oracle, linux-raspi, linux-realtime)
| From: | Rodrigo Figueiredo Zaiden via ubuntu-security-announce <ubuntu-security-announce@lists.ubuntu.com> | |
| To: | ubuntu-security-announce@lists.ubuntu.com | |
| Subject: | [USN-8388-1] Linux kernel vulnerabilities | |
| Date: | Thu, 04 Jun 2026 18:29:22 -0300 | |
| Message-ID: | <90cbff76-1716-40ee-adc8-3e5ca733eed5@canonical.com> | |
| Cc: | Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com> |
========================================================================== Ubuntu Security Notice USN-8388-1 June 04, 2026 linux, linux-aws, linux-aws-5.15, linux-aws-fips, linux-fips, linux-gcp, linux-gcp-5.15, 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-kvm, linux-nvidia, linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx, linux-oracle, linux-raspi, 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-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-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-raspi: Linux kernel for Raspberry Pi systems - linux-realtime: Linux kernel for Real-time systems - linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems - linux-gcp-5.15: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe-5.15: Linux hardware enablement (HWE) kernel - linux-ibm-5.15: Linux kernel for IBM cloud systems - linux-nvidia-tegra-5.15: Linux kernel for NVIDIA Tegra systems Details: 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: - RDS protocol; (CVE-2026-43494) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 22.04 LTS linux-image-5.15.0-1050-nvidia-tegra-igx 5.15.0-1050.50 linux-image-5.15.0-1050-nvidia-tegra-igx-rt 5.15.0-1050.50 linux-image-5.15.0-1061-nvidia-tegra 5.15.0-1061.61 linux-image-5.15.0-1061-nvidia-tegra-rt 5.15.0-1061.61 linux-image-5.15.0-1092-gkeop 5.15.0-1092.100 linux-image-5.15.0-1101-intel-iot-realtime 5.15.0-1101.103 Available with Ubuntu Pro linux-image-5.15.0-1101-kvm 5.15.0-1101.106 linux-image-5.15.0-1103-ibm 5.15.0-1103.106 linux-image-5.15.0-1103-raspi 5.15.0-1103.106 linux-image-5.15.0-1104-intel-iotg 5.15.0-1104.110 linux-image-5.15.0-1104-nvidia 5.15.0-1104.105 linux-image-5.15.0-1104-nvidia-lowlatency 5.15.0-1104.105 linux-image-5.15.0-1105-gke 5.15.0-1105.111 linux-image-5.15.0-1106-oracle 5.15.0-1106.112 linux-image-5.15.0-1108-realtime 5.15.0-1108.117 Available with Ubuntu Pro linux-image-5.15.0-1109-aws 5.15.0-1109.116 linux-image-5.15.0-1109-aws-64k 5.15.0-1109.116 linux-image-5.15.0-1109-aws-fips 5.15.0-1109.116+fips1 Available with Ubuntu Pro linux-image-5.15.0-1109-gcp 5.15.0-1109.118 linux-image-5.15.0-1109-gcp-fips 5.15.0-1109.118+fips1 Available with Ubuntu Pro linux-image-5.15.0-181-fips 5.15.0-181.191+fips1 Available with Ubuntu Pro linux-image-5.15.0-181-generic 5.15.0-181.191 linux-image-5.15.0-181-generic-64k 5.15.0-181.191 linux-image-5.15.0-181-generic-lpae 5.15.0-181.191 linux-image-aws-5.15 5.15.0.1109.112 linux-image-aws-64k-5.15 5.15.0.1109.112 linux-image-aws-64k-lts-22.04 5.15.0.1109.112 linux-image-aws-fips 5.15.0.1109.105 Available with Ubuntu Pro linux-image-aws-fips-5.15 5.15.0.1109.105 Available with Ubuntu Pro linux-image-aws-lts-22.04 5.15.0.1109.112 linux-image-fips 5.15.0.181.106 Available with Ubuntu Pro linux-image-fips-5.15 5.15.0.181.106 Available with Ubuntu Pro linux-image-gcp-5.15 5.15.0.1109.105 linux-image-gcp-fips 5.15.0.1109.99 Available with Ubuntu Pro linux-image-gcp-fips-5.15 5.15.0.1109.99 Available with Ubuntu Pro linux-image-gcp-lts-22.04 5.15.0.1109.105 linux-image-generic 5.15.0.181.164 linux-image-generic-5.15 5.15.0.181.164 linux-image-generic-64k 5.15.0.181.164 linux-image-generic-64k-5.15 5.15.0.181.164 linux-image-generic-lpae 5.15.0.181.164 linux-image-generic-lpae-5.15 5.15.0.181.164 linux-image-gke 5.15.0.1105.104 linux-image-gke-5.15 5.15.0.1105.104 linux-image-gkeop 5.15.0.1092.91 linux-image-gkeop-5.15 5.15.0.1092.91 linux-image-ibm 5.15.0.1103.99 linux-image-ibm-5.15 5.15.0.1103.99 linux-image-intel-iot-realtime 5.15.0.1101.105 Available with Ubuntu Pro linux-image-intel-iot-realtime-5.15 5.15.0.1101.105 Available with Ubuntu Pro linux-image-intel-iotg 5.15.0.1104.103 linux-image-intel-iotg-5.15 5.15.0.1104.103 linux-image-kvm 5.15.0.1101.97 linux-image-kvm-5.15 5.15.0.1101.97 linux-image-nvidia 5.15.0.1104.104 linux-image-nvidia-5.15 5.15.0.1104.104 linux-image-nvidia-lowlatency 5.15.0.1104.104 linux-image-nvidia-lowlatency-5.15 5.15.0.1104.104 linux-image-nvidia-tegra 5.15.0.1061.61 linux-image-nvidia-tegra-5.15 5.15.0.1061.61 linux-image-nvidia-tegra-igx 5.15.0.1050.52 linux-image-nvidia-tegra-igx-5.15 5.15.0.1050.52 linux-image-nvidia-tegra-igx-rt 5.15.0.1050.52 linux-image-nvidia-tegra-igx-rt-5.15 5.15.0.1050.52 linux-image-nvidia-tegra-rt 5.15.0.1061.61 linux-image-nvidia-tegra-rt-5.15 5.15.0.1061.61 linux-image-oem-20.04 5.15.0.181.164 linux-image-oracle-5.15 5.15.0.1106.102 linux-image-oracle-lts-22.04 5.15.0.1106.102 linux-image-raspi 5.15.0.1103.101 linux-image-raspi-5.15 5.15.0.1103.101 linux-image-raspi-nolpae 5.15.0.1103.101 linux-image-realtime 5.15.0.1108.112 Available with Ubuntu Pro linux-image-realtime-5.15 5.15.0.1108.112 Available with Ubuntu Pro linux-image-virtual 5.15.0.181.164 linux-image-virtual-5.15 5.15.0.181.164 Ubuntu 20.04 LTS linux-image-5.15.0-1061-nvidia-tegra 5.15.0-1061.61~20.04.1 Available with Ubuntu Pro linux-image-5.15.0-1061-nvidia-tegra-rt 5.15.0-1061.61~20.04.1 Available with Ubuntu Pro linux-image-5.15.0-1103-ibm 5.15.0-1103.106~20.04.1 Available with Ubuntu Pro linux-image-5.15.0-1109-aws 5.15.0-1109.116~20.04.1 Available with Ubuntu Pro linux-image-5.15.0-1109-gcp 5.15.0-1109.118~20.04.1 Available with Ubuntu Pro linux-image-5.15.0-181-generic 5.15.0-181.191~20.04.1 Available with Ubuntu Pro linux-image-5.15.0-181-generic-64k 5.15.0-181.191~20.04.1 Available with Ubuntu Pro linux-image-5.15.0-181-generic-lpae 5.15.0-181.191~20.04.1 Available with Ubuntu Pro linux-image-aws 5.15.0.1109.116~20.04.1 Available with Ubuntu Pro linux-image-aws-5.15 5.15.0.1109.116~20.04.1 Available with Ubuntu Pro linux-image-gcp 5.15.0.1109.118~20.04.1 Available with Ubuntu Pro linux-image-gcp-5.15 5.15.0.1109.118~20.04.1 Available with Ubuntu Pro linux-image-generic-5.15 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-generic-64k-5.15 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-generic-64k-hwe-20.04 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-generic-hwe-20.04 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-generic-lpae-5.15 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-generic-lpae-hwe-20.04 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-ibm 5.15.0.1103.106~20.04.1 Available with Ubuntu Pro linux-image-ibm-5.15 5.15.0.1103.106~20.04.1 Available with Ubuntu Pro linux-image-nvidia-tegra 5.15.0.1061.61~20.04.1 Available with Ubuntu Pro linux-image-nvidia-tegra-5.15 5.15.0.1061.61~20.04.1 Available with Ubuntu Pro linux-image-nvidia-tegra-rt 5.15.0.1061.61~20.04.1 Available with Ubuntu Pro linux-image-nvidia-tegra-rt-5.15 5.15.0.1061.61~20.04.1 Available with Ubuntu Pro linux-image-oem-20.04 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-oem-20.04b 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-oem-20.04c 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-oem-20.04d 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-virtual-5.15 5.15.0.181.191~20.04.1 Available with Ubuntu Pro linux-image-virtual-hwe-20.04 5.15.0.181.191~20.04.1 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-8388-1 CVE-2026-43284, CVE-2026-43494, CVE-2026-43500, CVE-2026-43503, CVE-2026-46300, CVE-2026-46333 Package Information: https://launchpad.net/ubuntu/+source/linux/5.15.0-181.191 https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-110... https://launchpad.net/ubuntu/+source/linux-aws-fips/5.15.... https://launchpad.net/ubuntu/+source/linux-fips/5.15.0-18... https://launchpad.net/ubuntu/+source/linux-gcp/5.15.0-110... https://launchpad.net/ubuntu/+source/linux-gcp-fips/5.15.... https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-110... https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1... https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-110... https://launchpad.net/ubuntu/+source/linux-intel-iot-real... https://launchpad.net/ubuntu/+source/linux-intel-iotg/5.1... https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-110... https://launchpad.net/ubuntu/+source/linux-nvidia/5.15.0-... https://launchpad.net/ubuntu/+source/linux-nvidia-tegra/5... https://launchpad.net/ubuntu/+source/linux-nvidia-tegra-i... https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-... https://launchpad.net/ubuntu/+source/linux-raspi/5.15.0-1... https://launchpad.net/ubuntu/+source/linux-realtime/5.15....
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