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A medium severity vulnerability (CVE-2026-53107) in the Linux kernel's libertas wifi driver was resolved. The issue involved improper handling of USB Request Blocks (URBs) in interrupt context, which could cause transmission serialization problems and potential system instability or denial of service. The vulnerability affects multiple linux-hwe-edge kernel versions prior to specific 7.0.0-xx releases. A patch is available and included in updated Linux kernel packages. Users should update and reboot to apply the fix.

The vulnerability in the Linux kernel libertas wifi driver involved killing USB Request Blocks (URBs) in interrupt context, which is unsafe because usb_kill_urb()/usb_kill_anchored_urbs() can sleep and thus cannot be called from interrupt context. The fix prevents sleeping during interrupt context by checking for existing URBs and returning -EBUSY if a request is pending, avoiding unsafe URB termination. This resolves potential issues in the TX path serialization. The vulnerability is fixed in linux-hwe-edge kernel versions 7.0.0-28.28 and later variants as detailed in the Ubuntu security advisories USN-8566-1 and USN-8568-1.

Detailed information about UBUNTU-CVE-2026-53107 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-53107 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: wifi: libertas: don't kill URBs in interrupt context Serialization for the TX… (CVE-2026-53107)

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