{"id":"CVE-2026-68217","summary":"media: pwc: Drain fill_buf on start_streaming() failure","details":"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-\u003efill_buf =\n                                      pwc_get_next_fill_buf(pdev)\n      usb_submit_urb(urbs[i\u003e0], ..)  -\u003e 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-\u003equeued_bufs and\nstores it in pdev-\u003efill_buf. The error path in start_streaming() only\ndrains pdev-\u003equeued_bufs, so the buffer parked in pdev-\u003efill_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/","modified":"2026-08-21T03:30:10.252338994Z","published":"2026-08-10T12:00:36.773Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68217.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5d4812668b03f823b5044789d6aa77fe56b42587"},{"type":"WEB","url":"https://git.kernel.org/stable/c/906e410dcffbbd99fb4081abab817a830033aa28"},{"type":"WEB","url":"https://git.kernel.org/stable/c/97f3c15957ec7e6d249f05407ad947c0644df24d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9afd605dcd96c7a45f338eded1de16679b30e1df"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a4afffd148991a826e8995362fb10cf8705c1130"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a56e7641e09bd80b976e944ae759109b86fd5b38"},{"type":"WEB","url":"https://git.kernel.org/stable/c/acc789b2173070638cad89c2b61d33ed338be0dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eabe9a59640698137d7382d5b549e95dc37f7565"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68217.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68217"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"885fe18f5542fe283a17f70583383c6cadcba1c3"},{"fixed":"97f3c15957ec7e6d249f05407ad947c0644df24d"},{"fixed":"a4afffd148991a826e8995362fb10cf8705c1130"},{"fixed":"eabe9a59640698137d7382d5b549e95dc37f7565"},{"fixed":"a56e7641e09bd80b976e944ae759109b86fd5b38"},{"fixed":"acc789b2173070638cad89c2b61d33ed338be0dd"},{"fixed":"9afd605dcd96c7a45f338eded1de16679b30e1df"},{"fixed":"5d4812668b03f823b5044789d6aa77fe56b42587"},{"fixed":"906e410dcffbbd99fb4081abab817a830033aa28"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68217.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68217.json"}}],"schema_version":"1.9.0"}