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A memory leak vulnerability in the Linux kernel's mcba_usb driver was fixed. The issue involved USB Request Blocks (URBs) not being properly anchored and released, causing a memory leak. This was addressed by anchoring the URBs correctly in the mcba_usb_read_bulk_callback() function. The vulnerability affects certain linux-azure kernel versions prior to specific 5.15.0 releases. A patch is available and included in updated kernel packages.

The Linux kernel's mcba_usb driver had a memory leak vulnerability (CVE-2026-23080) caused by URBs for USB-in transfers not being properly anchored after completion. The USB framework unanchors URBs before the completion callback is called, so the existing cleanup function usb_kill_anchored_urbs() did not free these URBs, leading to a memory leak. The fix anchors the URBs again in the mcba_usb_read_bulk_callback() to ensure proper release. This vulnerability was resolved in linux-azure kernel versions 5.15.0-1105.112~20.04.1 and later.

Detailed information about UBUNTU-CVE-2026-23080 affecting null linux-azure. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23080 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux azure: In the Linux kernel, the following vulnerability has been resolved: can: mcba_usb: mcba_usb_read_bulk_callback(): fix URB memory leak Fix similar… (CVE-2026-23080)

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