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A memory leak vulnerability in the Linux kernel's esd_usb driver (CVE-2026-23075) has been fixed. The issue involves URBs (USB Request Blocks) used for USB-in transfers that are not properly anchored after completion, causing them to not be released and resulting in a memory leak. This was addressed by anchoring the URB in the callback function to ensure proper cleanup. The vulnerability affects certain Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and similar versions. A patch is available and included in updated Linux kernel packages distributed by Ubuntu. The vulnerability has a medium severity with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability due to the memory leak. No known exploits are reported in the wild.

The Linux kernel's esd_usb driver suffered from a memory leak vulnerability (CVE-2026-23075) caused by USB Request Blocks (URBs) not being properly anchored after completion in the esd_usb_read_bulk_callback() function. Although URBs are allocated and anchored on submission, the USB framework unanchors them before the completion callback is invoked, leading to URBs not being freed in esd_usb_close(). The fix involves re-anchoring the URB within the completion callback to ensure proper release and prevent memory leaks. This vulnerability affects multiple Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and related builds. Ubuntu has released patches for affected kernel packages, and users are advised to update and reboot to apply the fix. The vulnerability has a CVSS 3.1 base score of 5.5 (medium severity), with local attack vector, low complexity, low privileges required, no user interaction, and impacts availability only. No active exploitation has been reported.

Detailed information about UBUNTU-CVE-2026-23075 affecting null linux. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23075 - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: can: esd_usb: esd_usb_read_bulk_callback(): fix URB memory leak Fix similar… (CVE-2026-23075)

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