Bug 2451173 (CVE-2026-23347)

Summary: CVE-2026-23347 kernel: can: usb: f81604: correctly anchor the urb in the read bulk callback
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's `can: usb: f81604` driver. When a USB Request Block (urb) is submitted, it is not correctly anchored in the read bulk callback. This oversight could lead to a resource leak if `usb_kill_anchored_urbs()` is called, potentially resulting in a Denial of Service (DoS) due to resource exhaustion.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-03-25 11:02:39 UTC 
In the Linux kernel, the following vulnerability has been resolved:

can: usb: f81604: correctly anchor the urb in the read bulk callback

When submitting an urb, that is using the anchor pattern, it needs to be
anchored before submitting it otherwise it could be leaked if
usb_kill_anchored_urbs() is called.  This logic is correctly done
elsewhere in the driver, except in the read bulk callback so do that
here also.
Comment 1 Alexander B 2026-03-25 18:13:17 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026032536-CVE-2026-23347-fa08@gregkh/T