========================================================================== Ubuntu Security Notice USN-8370-1 June 02, 2026
linux, linux-aws, linux-gcp, linux-ibm, linux-nvidia, linux-oracle, linux-raspi, linux-realtime vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-ibm: Linux kernel for IBM cloud systems - linux-nvidia: Linux kernel for NVIDIA 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 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, 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) A security issue was discovered in the Linux kernel. An attacker could possibly use this to compromise the system. This update corrects flaws in the following subsystem: - RDS protocol; (CVE-2026-43494) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS linux-image-7.0.0-1005-gcp 7.0.0-1005.5 linux-image-7.0.0-1005-gcp-64k 7.0.0-1005.5 linux-image-7.0.0-1005-oracle 7.0.0-1005.5 linux-image-7.0.0-1005-oracle-64k 7.0.0-1005.5 linux-image-7.0.0-1006-aws 7.0.0-1006.6 linux-image-7.0.0-1006-aws-64k 7.0.0-1006.6 linux-image-7.0.0-1007-ibm 7.0.0-1007.7 linux-image-7.0.0-1009-nvidia 7.0.0-1009.9 linux-image-7.0.0-1009-nvidia-64k 7.0.0-1009.9 linux-image-7.0.0-1011-raspi 7.0.0-1011.11 linux-image-7.0.0-1011-raspi-realtime 7.0.0-1011.11 linux-image-7.0.0-22-generic 7.0.0-22.22 linux-image-7.0.0-22-generic-64k 7.0.0-22.22 linux-image-7.0.0-22-realtime 7.0.0-22.22.1 linux-image-7.0.0-22-realtime-64k 7.0.0-22.22.1 linux-image-aws 7.0.0-1006.6 linux-image-aws-64k 7.0.0-1006.6 linux-image-aws-64k-7.0 7.0.0-1006.6 linux-image-aws-7.0 7.0.0-1006.6 linux-image-gcp 7.0.0-1005.5 linux-image-gcp-64k 7.0.0-1005.5 linux-image-gcp-64k-7.0 7.0.0-1005.5 linux-image-gcp-7.0 7.0.0-1005.5 linux-image-generic 7.0.0-22.22 linux-image-generic-64k 7.0.0-22.22 linux-image-generic-64k-7.0 7.0.0-22.22 linux-image-generic-64k-hwe-26.04 7.0.0-22.22 linux-image-generic-7.0 7.0.0-22.22 linux-image-generic-hwe-26.04 7.0.0-22.22 linux-image-ibm 7.0.0-1007.7 linux-image-ibm-7.0 7.0.0-1007.7 linux-image-nvidia 7.0.0-1009.9 linux-image-nvidia-64k 7.0.0-1009.9 linux-image-nvidia-64k-7.0 7.0.0-1009.9 linux-image-nvidia-7.0 7.0.0-1009.9 linux-image-oracle 7.0.0-1005.5 linux-image-oracle-64k 7.0.0-1005.5 linux-image-oracle-64k-7.0 7.0.0-1005.5 linux-image-oracle-7.0 7.0.0-1005.5 linux-image-raspi 7.0.0-1011.11 linux-image-raspi-7.0 7.0.0-1011.11 linux-image-raspi-realtime 7.0.0-1011.11 linux-image-raspi-realtime-7.0 7.0.0-1011.11 linux-image-realtime 7.0.0-22.22.1 linux-image-realtime-64k 7.0.0-22.22.1 linux-image-realtime-64k-7.0 7.0.0-22.22.1 linux-image-realtime-64k-hwe-26.04 7.0.0-22.22.1 linux-image-realtime-7.0 7.0.0-22.22.1 linux-image-realtime-hwe-26.04 7.0.0-22.22.1 linux-image-virtual 7.0.0-22.22 linux-image-virtual-7.0 7.0.0-22.22 linux-image-virtual-hwe-26.04 7.0.0-22.22 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-8370-1 CVE-2026-43284, CVE-2026-43494, CVE-2026-43500, CVE-2026-43503, CVE-2026-45998, CVE-2026-46000, 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/7.0.0-22.22 https://launchpad.net/ubuntu/+source/linux-aws/7.0.0-1006.6 https://launchpad.net/ubuntu/+source/linux-gcp/7.0.0-1005.5 https://launchpad.net/ubuntu/+source/linux-ibm/7.0.0-1007.7 https://launchpad.net/ubuntu/+source/linux-nvidia/7.0.0-1009.9 https://launchpad.net/ubuntu/+source/linux-oracle/7.0.0-1005.5 https://launchpad.net/ubuntu/+source/linux-raspi/7.0.0-1011.11 https://launchpad.net/ubuntu/+source/linux-realtime/7.0.0-22.22.1
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