Bug 2467240 (CVE-2026-43223)

Summary: CVE-2026-43223 kernel: media: pvrusb2: fix URB leak in pvr2_send_request_ex
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's pvrusb2 media driver. When the `pvr2_send_request_ex()` function submits a write USB Request Block (URB) but fails to submit a read URB, the write URB remains active. A subsequent attempt to use this URB triggers a warning, which can lead to system instability or a denial of service.
 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 2026-05-06 13:12:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

media: pvrusb2: fix URB leak in pvr2_send_request_ex

When pvr2_send_request_ex() submits a write URB successfully but fails to
submit the read URB (e.g. returns -ENOMEM), it returns immediately without
waiting for the write URB to complete. Since the driver reuses the same
URB structure, a subsequent call to pvr2_send_request_ex() attempts to
submit the still-active write URB, triggering a 'URB submitted while
active' warning in usb_submit_urb().

Fix this by ensuring the write URB is unlinked and waited upon if the read
URB submission fails.
Comment 1 Keith Grant 2026-05-06 22:09:01 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050653-CVE-2026-43223-9e04@gregkh/T