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A memory leak vulnerability in the Linux kernel's kvaser_usb driver was fixed. The issue involved URBs (USB Request Blocks) not being properly anchored after completion, causing them not to be freed and resulting in a memory leak. This vulnerability affects certain Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and similar versions. The flaw was addressed by properly anchoring URBs in the completion callback. The vulnerability has a medium severity with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability. A patch is available and included in updated Linux kernel packages distributed by Ubuntu. Users should update and reboot to apply the fix.

The vulnerability in the Linux kernel's kvaser_usb driver (CVE-2026-23061) is a memory leak caused by improper handling of USB Request Blocks (URBs). Specifically, URBs allocated for USB-in transfers are anchored and submitted, but once completed, the USB framework unanchors them before the completion callback is called. This leads to the URBs not being freed by usb_kill_anchored_urbs(), causing a memory leak. The fix involves re-anchoring the URBs in the completion callback to ensure proper cleanup. This issue affects Linux kernel versions prior to certain 5.15.0-xxx releases on Ubuntu 20.04 LTS and 22.04 LTS. The vulnerability has a CVSS 3.1 base score of 5.5 (medium severity), with local attack vector, low complexity, requiring low privileges, no user interaction, and impacts availability only. Ubuntu has released patched kernel packages to address this and other kernel vulnerabilities, requiring system updates and reboots. Due to ABI changes, recompilation of third-party kernel modules may be necessary.

Detailed information about UBUNTU-CVE-2026-23061 affecting null linux. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23061 - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak Fix… (CVE-2026-23061)

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