{"cve":"CVE-2026-68217","nvd":{"published":"2026-08-10T13:20:09.657","modified":"2026-08-19T17:20:37.867","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: pwc: Drain fill_buf on start_streaming() failure\n\npwc_isoc_init() submits its isochronous URBs with\nusb_submit_urb(.., GFP_KERNEL) in a loop. After the first URB is\nsubmitted, its completion handler pwc_isoc_handler() can run on another\nCPU before the loop finishes:\n\n  start_streaming()\n    pwc_isoc_init()\n      usb_submit_urb(urbs[0], GFP_KERNEL)\n                                  pwc_isoc_handler(urbs[0])\n                                    pdev->fill_buf =\n                                      pwc_get_next_fill_buf(pdev)\n      usb_submit_urb(urbs[i>0], ..)  -> fails\n      pwc_isoc_cleanup(pdev)           /* kills URBs */\n      return ret;\n    pwc_cleanup_queued_bufs(pdev, VB2_BUF_STATE_QUEUED)\n\npwc_get_next_fill_buf() detaches a buffer from pdev->queued_bufs and\nstores it in pdev->fill_buf. The error path in start_streaming() only\ndrains pdev->queued_bufs, so the buffer parked in pdev->fill_buf is\nleaked. vb2_start_streaming() then triggers\nWARN_ON(owned_by_drv_count).\n\nstop_streaming() already handles this since commit 80b0963e1698\n(\"[media] pwc: fix WARN_ON\"), which added the fill_buf drain in the\nteardown path but not in the start_streaming() error path. Mirror that\nhandling on failure so start_streaming() returns with no buffer owned\nby the driver.\n\nIssue identified by automated review of the INV-003 series at\nhttps://sashiko.dev/","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/5d4812668b03f823b5044789d6aa77fe56b42587","https://git.kernel.org/stable/c/906e410dcffbbd99fb4081abab817a830033aa28","https://git.kernel.org/stable/c/97f3c15957ec7e6d249f05407ad947c0644df24d","https://git.kernel.org/stable/c/9afd605dcd96c7a45f338eded1de16679b30e1df","https://git.kernel.org/stable/c/a4afffd148991a826e8995362fb10cf8705c1130"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:47:54.990491175+00:00"},"epss":{"cve":"CVE-2026-68217","score":0.0022,"percentile":0.12572,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}