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A vulnerability in the Linux kernel's intel_th driver caused a device reference leak during output device open() operations. The issue involved failure to drop references properly on both error and successful open() calls, potentially leading to resource exhaustion and denial of service. This flaw has been fixed in updated kernel versions. The vulnerability has a medium severity with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability. No known exploits are reported in the wild. Users should update to the patched Linux kernel versions to remediate the issue.

CVE-2026-23091 is a vulnerability in the Linux kernel's intel_th (Intel Trace Hub) driver where device references were leaked during output device open() calls. Although some error paths were fixed previously, references still leaked on successful open(), causing resource leaks. This could lead to denial of service by exhausting device references. The issue has been addressed in updated Linux kernel packages for linux-aws. The vulnerability has a CVSS 3.1 base score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), indicating local attacker privileges can cause availability impact without affecting confidentiality or integrity. The vendor advisory from Ubuntu confirms the fix is available and recommends updating the kernel and rebooting the system.

Detailed information about UBUNTU-CVE-2026-23091 affecting null linux-aws. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23091 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux aws: In the Linux kernel, the following vulnerability has been resolved: intel_th: fix device leak on output open() Make sure to drop the reference taken… (CVE-2026-23091)

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