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A memory leak vulnerability in the Linux kernel's CAN network layer driver ems_usb was fixed. The issue involved USB Request Blocks (URBs) not being properly anchored and released, causing a memory leak. This flaw was addressed by anchoring the URBs correctly in the ems_usb_read_bulk_callback() function. The vulnerability affects multiple Linux kernel versions prior to specific patched releases. Ubuntu has released updates fixing this and other kernel vulnerabilities, requiring a system reboot and recompilation of third-party kernel modules due to ABI changes.

The vulnerability in the Linux kernel's ems_usb driver (CAN network layer) was caused by improper handling of USB Request Blocks (URBs) in the ems_usb_read_bulk_callback() function. Specifically, URBs were unanchored by the USB framework before the callback was called, leading to them not being freed in ems_usb_close(), resulting in a memory leak. The fix involves anchoring the URBs again within the callback to ensure proper release. This issue is similar to a previously fixed memory leak in the gs_usb driver. The vulnerability affects Linux kernel versions prior to the patched releases listed in the Ubuntu advisories. Multiple Linux kernel subsystems were updated in the related Ubuntu security notices, and the fixes require rebooting and recompiling kernel modules due to ABI changes.

Detailed information about UBUNTU-CVE-2026-23058 affecting null linux. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23058 - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak Fix similar… (CVE-2026-23058)

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