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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-68217

media: pwc: Drain fill_buf on start_streaming() failure

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: media: pwc: Drain fill_buf on start_streaming() failure pwc_isoc_init() submits its isochronous URBs with usb_submit_urb(.., GFP_KERNEL) in a loop. After the first URB is submitted, its completion handler pwc_isoc_handler() can run on another CPU before the loop finishes: start_streaming() pwc_isoc_init() usb_submit_urb(urbs[0], GFP_KERNEL) pwc_isoc_handler(urbs[0]) pdev->fill_buf = pwc_get_next_fill_buf(pdev) usb_submit_urb(urbs[i>0], ..) -> fails pwc_isoc_cleanup(pdev) /* kills URBs */ return ret; pwc_cleanup_queued_bufs(pdev, VB2_BUF_STATE_QUEUED) pwc_get_next_fill_buf() detaches a buffer from pdev->queued_bufs and stores it in pdev->fill_buf. The error path in start_streaming() only drains pdev->queued_bufs, so the buffer parked in pdev->fill_buf is leaked. vb2_start_streaming() then triggers WARN_ON(owned_by_drv_count). stop_streaming() already handles this since commit 80b0963e1698 ("[media] pwc: fix WARN_ON"), which added the fill_buf drain in the teardown path but not in the start_streaming() error path. Mirror that handling on failure so start_streaming() returns with no buffer owned by the driver. Issue identified by automated review of the INV-003 series at https://sashiko.dev/

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 885fe18f5542fe283a17f70583383c6cadcba1c3 to < 97f3c15957ec7e6d249f05407ad947c0644df24daffected
  • 885fe18f5542fe283a17f70583383c6cadcba1c3 to < a4afffd148991a826e8995362fb10cf8705c1130affected
  • 885fe18f5542fe283a17f70583383c6cadcba1c3 to < eabe9a59640698137d7382d5b549e95dc37f7565affected
  • 885fe18f5542fe283a17f70583383c6cadcba1c3 to < a56e7641e09bd80b976e944ae759109b86fd5b38affected
  • 885fe18f5542fe283a17f70583383c6cadcba1c3 to < acc789b2173070638cad89c2b61d33ed338be0ddaffected
  • 885fe18f5542fe283a17f70583383c6cadcba1c3 to < 9afd605dcd96c7a45f338eded1de16679b30e1dfaffected
  • 885fe18f5542fe283a17f70583383c6cadcba1c3 to < 5d4812668b03f823b5044789d6aa77fe56b42587affected
  • 885fe18f5542fe283a17f70583383c6cadcba1c3 to < 906e410dcffbbd99fb4081abab817a830033aa28affected

Linux Linux

Default version status: affected

  • 3.1affected
  • 0 to < 3.1unaffected
  • 5.10.265 to ≤ 5.10.*unaffected
  • 5.15.216 to ≤ 5.15.*unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.148 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.1.6 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References