Ubuntu alert USN-8371-1 (linux, linux-aws, linux-azure, linux-azure-6.17, linux-hwe-6.17, linux-nvidia-6.17, linux-oem-6.17, linux-oracle, linux-oracle-6.17, linux-raspi, linux-realtime, linux-realtime-6.17)
| From: | Rodrigo Figueiredo Zaiden via ubuntu-security-announce <ubuntu-security-announce@lists.ubuntu.com> | |
| To: | ubuntu-security-announce@lists.ubuntu.com | |
| Subject: | [USN-8371-1] Linux kernel vulnerabilities | |
| Date: | Tue, 02 Jun 2026 11:49:42 -0300 | |
| Message-ID: | <70600d1e-7bc1-4932-a4d2-93ddf2ee4917@canonical.com> | |
| Cc: | Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com> |
========================================================================== Ubuntu Security Notice USN-8371-1 June 02, 2026 linux, linux-aws, linux-azure, linux-azure-6.17, linux-hwe-6.17, linux-nvidia-6.17, linux-oem-6.17, linux-oracle, linux-oracle-6.17, linux-raspi, linux-realtime, linux-realtime-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: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-azure: Linux kernel for Microsoft Azure Cloud 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-azure-6.17: Linux kernel for Microsoft Azure cloud systems - linux-hwe-6.17: Linux hardware enablement (HWE) kernel - linux-nvidia-6.17: Linux kernel for NVIDIA systems - linux-oem-6.17: Linux kernel for OEM systems - linux-oracle-6.17: Linux kernel for Oracle Cloud systems - linux-realtime-6.17: 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) 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; - RxRPC session sockets; (CVE-2026-31676, CVE-2026-43494) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 linux-image-6.17.0-1014-realtime 6.17.0-1014.16 linux-image-6.17.0-1016-oracle 6.17.0-1016.16 linux-image-6.17.0-1016-oracle-64k 6.17.0-1016.16 linux-image-6.17.0-1017-aws 6.17.0-1017.17 linux-image-6.17.0-1017-aws-64k 6.17.0-1017.17 linux-image-6.17.0-1017-azure 6.17.0-1017.17 linux-image-6.17.0-1018-raspi 6.17.0-1018.18 linux-image-6.17.0-35-generic 6.17.0-35.35 linux-image-6.17.0-35-generic-64k 6.17.0-35.35 linux-image-aws 6.17.0-1017.17 linux-image-aws-6.17 6.17.0-1017.17 linux-image-aws-64k 6.17.0-1017.17 linux-image-aws-64k-6.17 6.17.0-1017.17 linux-image-azure 6.17.0-1017.17 linux-image-azure-6.17 6.17.0-1017.17 linux-image-generic 6.17.0-35.35 linux-image-generic-6.17 6.17.0-35.35 linux-image-generic-64k 6.17.0-35.35 linux-image-generic-64k-6.17 6.17.0-35.35 linux-image-oracle 6.17.0-1016.16 linux-image-oracle-6.17 6.17.0-1016.16 linux-image-oracle-64k 6.17.0-1016.16 linux-image-oracle-64k-6.17 6.17.0-1016.16 linux-image-raspi 6.17.0-1018.18 linux-image-raspi-6.17 6.17.0-1018.18 linux-image-realtime 6.17.0-1014.16 linux-image-realtime-6.17 6.17.0-1014.16 linux-image-virtual 6.17.0-35.35 linux-image-virtual-6.17 6.17.0-35.35 Ubuntu 24.04 LTS linux-image-6.17.0-1014-realtime 6.17.0-1014.16~24.04.1 Available with Ubuntu Pro linux-image-6.17.0-1016-oracle 6.17.0-1016.16~24.04.1 linux-image-6.17.0-1016-oracle-64k 6.17.0-1016.16~24.04.1 linux-image-6.17.0-1017-azure 6.17.0-1017.17~24.04.1 linux-image-6.17.0-1021-nvidia 6.17.0-1021.21 linux-image-6.17.0-1021-nvidia-64k 6.17.0-1021.21 linux-image-6.17.0-1024-oem 6.17.0-1024.24 linux-image-6.17.0-35-generic 6.17.0-35.35~24.04.1 linux-image-6.17.0-35-generic-64k 6.17.0-35.35~24.04.1 linux-image-azure 6.17.0-1017.17~24.04.1 linux-image-azure-6.17 6.17.0-1017.17~24.04.1 linux-image-generic-6.17 6.17.0-35.35~24.04.1 linux-image-generic-64k-6.17 6.17.0-35.35~24.04.1 linux-image-generic-64k-hwe-24.04 6.17.0-35.35~24.04.1 linux-image-generic-hwe-24.04 6.17.0-35.35~24.04.1 linux-image-nvidia-6.17 6.17.0-1021.21 linux-image-nvidia-64k-6.17 6.17.0-1021.21 linux-image-nvidia-64k-hwe-24.04 6.17.0-1021.21 linux-image-nvidia-hwe-24.04 6.17.0-1021.21 linux-image-oem-24.04 6.17.0-1024.24 linux-image-oem-24.04a 6.17.0-1024.24 linux-image-oem-24.04b 6.17.0-1024.24 linux-image-oem-24.04c 6.17.0-1024.24 linux-image-oem-24.04d 6.17.0-1024.24 linux-image-oem-6.17 6.17.0-1024.24 linux-image-oracle 6.17.0-1016.16~24.04.1 linux-image-oracle-6.17 6.17.0-1016.16~24.04.1 linux-image-oracle-64k 6.17.0-1016.16~24.04.1 linux-image-oracle-64k-6.17 6.17.0-1016.16~24.04.1 linux-image-realtime-6.17 6.17.0-1014.16~24.04.1 Available with Ubuntu Pro linux-image-realtime-hwe-24.04 6.17.0-1014.16~24.04.1 Available with Ubuntu Pro linux-image-virtual-6.17 6.17.0-35.35~24.04.1 linux-image-virtual-hwe-24.04 6.17.0-35.35~24.04.1 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-8371-1 CVE-2026-31676, 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/6.17.0-35.35 https://launchpad.net/ubuntu/+source/linux-aws/6.17.0-101... https://launchpad.net/ubuntu/+source/linux-azure/6.17.0-1... https://launchpad.net/ubuntu/+source/linux-oracle/6.17.0-... https://launchpad.net/ubuntu/+source/linux-raspi/6.17.0-1... https://launchpad.net/ubuntu/+source/linux-realtime/6.17.... https://launchpad.net/ubuntu/+source/linux-azure-6.17/6.1... https://launchpad.net/ubuntu/+source/linux-hwe-6.17/6.17.... https://launchpad.net/ubuntu/+source/linux-nvidia-6.17/6.... https://launchpad.net/ubuntu/+source/linux-oem-6.17/6.17.... https://launchpad.net/ubuntu/+source/linux-oracle-6.17/6.... https://launchpad.net/ubuntu/+source/linux-realtime-6.17/...
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