USN-8371-1: Linux kernel vulnerabilities
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:
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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ubuntu/linux-image-6.17.0-1014-realtimeto a version that resolves this vulnerability.Fixed in 6.17.0-1014.16 - Upgrade
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ubuntu/linux-image-6.17.0-1016-oracleto a version that resolves this vulnerability.Fixed in 6.17.0-1016.16 - Upgrade
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ubuntu/linux-image-6.17.0-1016-oracle-64kto a version that resolves this vulnerability.Fixed in 6.17.0-1016.16 - Upgrade
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ubuntu/linux-image-6.17.0-1017-awsto a version that resolves this vulnerability.Fixed in 6.17.0-1017.17 - Upgrade
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ubuntu/linux-image-6.17.0-1017-aws-64kto a version that resolves this vulnerability.Fixed in 6.17.0-1017.17 - Upgrade
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ubuntu/linux-image-6.17.0-1017-azureto a version that resolves this vulnerability.Fixed in 6.17.0-1017.17 - Upgrade
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ubuntu/linux-image-6.17.0-1018-raspito a version that resolves this vulnerability.Fixed in 6.17.0-1018.18 - Upgrade
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ubuntu/linux-image-6.17.0-35-genericto a version that resolves this vulnerability.Fixed in 6.17.0-35.35 - Upgrade
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ubuntu/linux-image-6.17.0-35-generic-64kto a version that resolves this vulnerability.Fixed in 6.17.0-35.35 - Upgrade
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ubuntu/linux-image-awsto a version that resolves this vulnerability.Fixed in 6.17.0-1017.17 - Upgrade
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ubuntu/linux-image-aws-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1017.17 - Upgrade
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ubuntu/linux-image-aws-64kto a version that resolves this vulnerability.Fixed in 6.17.0-1017.17 - Upgrade
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ubuntu/linux-image-aws-64k-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1017.17 - Upgrade
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ubuntu/linux-image-azureto a version that resolves this vulnerability.Fixed in 6.17.0-1017.17 - Upgrade
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ubuntu/linux-image-azure-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1017.17 - Upgrade
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ubuntu/linux-image-genericto a version that resolves this vulnerability.Fixed in 6.17.0-35.35 - Upgrade
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ubuntu/linux-image-generic-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-35.35 - Upgrade
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ubuntu/linux-image-generic-64kto a version that resolves this vulnerability.Fixed in 6.17.0-35.35 - Upgrade
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ubuntu/linux-image-generic-64k-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-35.35 - Upgrade
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ubuntu/linux-image-oracleto a version that resolves this vulnerability.Fixed in 6.17.0-1016.16 - Upgrade
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ubuntu/linux-image-oracle-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1016.16 - Upgrade
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ubuntu/linux-image-oracle-64kto a version that resolves this vulnerability.Fixed in 6.17.0-1016.16 - Upgrade
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ubuntu/linux-image-oracle-64k-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1016.16 - Upgrade
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ubuntu/linux-image-raspito a version that resolves this vulnerability.Fixed in 6.17.0-1018.18 - Upgrade
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ubuntu/linux-image-raspi-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1018.18 - Upgrade
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ubuntu/linux-image-realtimeto a version that resolves this vulnerability.Fixed in 6.17.0-1014.16 - Upgrade
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ubuntu/linux-image-realtime-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1014.16 - Upgrade
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ubuntu/linux-image-virtualto a version that resolves this vulnerability.Fixed in 6.17.0-35.35 - Upgrade
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ubuntu/linux-image-virtual-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-35.35 - Upgrade
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ubuntu/linux-image-6.17.0-1014-realtimeto a version that resolves this vulnerability.Fixed in Real-time - Upgrade
Upgrade
ubuntu/linux-image-6.17.0-1016-oracleto a version that resolves this vulnerability.Fixed in 6.17.0-1016.16~24.04.1 - Upgrade
Upgrade
ubuntu/linux-image-6.17.0-1016-oracle-64kto a version that resolves this vulnerability.Fixed in 6.17.0-1016.16~24.04.1 - Upgrade
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ubuntu/linux-image-6.17.0-1017-azureto a version that resolves this vulnerability.Fixed in 6.17.0-1017.17~24.04.1 - Upgrade
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ubuntu/linux-image-6.17.0-1021-nvidiato a version that resolves this vulnerability.Fixed in 6.17.0-1021.21 - Upgrade
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ubuntu/linux-image-6.17.0-1021-nvidia-64kto a version that resolves this vulnerability.Fixed in 6.17.0-1021.21 - Upgrade
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ubuntu/linux-image-6.17.0-1024-oemto a version that resolves this vulnerability.Fixed in 6.17.0-1024.24 - Upgrade
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ubuntu/linux-image-6.17.0-35-genericto a version that resolves this vulnerability.Fixed in 6.17.0-35.35~24.04.1 - Upgrade
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ubuntu/linux-image-6.17.0-35-generic-64kto a version that resolves this vulnerability.Fixed in 6.17.0-35.35~24.04.1 - Upgrade
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ubuntu/linux-image-azureto a version that resolves this vulnerability.Fixed in 6.17.0-1017.17~24.04.1 - Upgrade
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ubuntu/linux-image-azure-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1017.17~24.04.1 - Upgrade
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ubuntu/linux-image-generic-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-35.35~24.04.1 - Upgrade
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ubuntu/linux-image-generic-64k-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-35.35~24.04.1 - Upgrade
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ubuntu/linux-image-generic-64k-hwe-24.04to a version that resolves this vulnerability.Fixed in 6.17.0-35.35~24.04.1 - Upgrade
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ubuntu/linux-image-generic-hwe-24.04to a version that resolves this vulnerability.Fixed in 6.17.0-35.35~24.04.1 - Upgrade
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ubuntu/linux-image-nvidia-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1021.21 - Upgrade
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ubuntu/linux-image-nvidia-64k-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1021.21 - Upgrade
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ubuntu/linux-image-nvidia-64k-hwe-24.04to a version that resolves this vulnerability.Fixed in 6.17.0-1021.21 - Upgrade
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ubuntu/linux-image-nvidia-hwe-24.04to a version that resolves this vulnerability.Fixed in 6.17.0-1021.21 - Upgrade
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ubuntu/linux-image-oem-24.04to a version that resolves this vulnerability.Fixed in 6.17.0-1024.24 - Upgrade
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ubuntu/linux-image-oem-24.04ato a version that resolves this vulnerability.Fixed in 6.17.0-1024.24 - Upgrade
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ubuntu/linux-image-oem-24.04bto a version that resolves this vulnerability.Fixed in 6.17.0-1024.24 - Upgrade
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ubuntu/linux-image-oem-24.04cto a version that resolves this vulnerability.Fixed in 6.17.0-1024.24 - Upgrade
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ubuntu/linux-image-oem-24.04dto a version that resolves this vulnerability.Fixed in 6.17.0-1024.24 - Upgrade
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ubuntu/linux-image-oem-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1024.24 - Upgrade
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ubuntu/linux-image-oracleto a version that resolves this vulnerability.Fixed in 6.17.0-1016.16~24.04.1 - Upgrade
Upgrade
ubuntu/linux-image-oracle-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1016.16~24.04.1 - Upgrade
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ubuntu/linux-image-oracle-64kto a version that resolves this vulnerability.Fixed in 6.17.0-1016.16~24.04.1 - Upgrade
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ubuntu/linux-image-oracle-64k-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1016.16~24.04.1 - Upgrade
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ubuntu/linux-image-realtime-6.17to a version that resolves this vulnerability.Fixed in Real-time - Upgrade
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ubuntu/linux-image-realtime-hwe-24.04to a version that resolves this vulnerability.Fixed in Real-time - Upgrade
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ubuntu/linux-image-virtual-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-35.35~24.04.1 - Upgrade
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ubuntu/linux-image-virtual-hwe-24.04to a version that resolves this vulnerability.Fixed in 6.17.0-35.35~24.04.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch USN-8371-1
Event History
Child vulnerabilities
Contains the following vulnerabilities.
Frequently Asked Questions
What is the severity of USN-8371-1?
The severity of USN-8371-1 is classified as 55, indicating a significant risk to affected systems.
How do I fix USN-8371-1?
To fix USN-8371-1, update your Ubuntu Linux kernel to the latest available version as recommended by the security advisory.
What vulnerabilities are addressed in USN-8371-1?
USN-8371-1 addresses vulnerabilities identified as CVE-2026-47337, CVE-2026-47334, and CVE-2026-47333.
What systems are affected by USN-8371-1?
USN-8371-1 affects Ubuntu systems running the specified versions of the Linux kernel.
When was USN-8371-1 released?
USN-8371-1 was released to address security vulnerabilities on an urgent basis, although the exact release date is not specified.