{"id":"CVE-2026-68217","state":"PUBLISHED","title":"media: pwc: Drain fill_buf on start_streaming() failure","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/","publishedAt":"2026-08-10T12:00:36.773Z","updatedAt":"2026-08-19T16:31:48.858Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"97f3c15957ec7e6d249f05407ad947c0644df24d","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"a4afffd148991a826e8995362fb10cf8705c1130","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"eabe9a59640698137d7382d5b549e95dc37f7565","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"a56e7641e09bd80b976e944ae759109b86fd5b38","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"acc789b2173070638cad89c2b61d33ed338be0dd","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"9afd605dcd96c7a45f338eded1de16679b30e1df","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"5d4812668b03f823b5044789d6aa77fe56b42587","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"906e410dcffbbd99fb4081abab817a830033aa28","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/usb/pwc/pwc-if.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.1","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/usb/pwc/pwc-if.c"]}],"references":["https://git.kernel.org/stable/c/97f3c15957ec7e6d249f05407ad947c0644df24d","https://git.kernel.org/stable/c/a4afffd148991a826e8995362fb10cf8705c1130","https://git.kernel.org/stable/c/eabe9a59640698137d7382d5b549e95dc37f7565","https://git.kernel.org/stable/c/a56e7641e09bd80b976e944ae759109b86fd5b38","https://git.kernel.org/stable/c/acc789b2173070638cad89c2b61d33ed338be0dd","https://git.kernel.org/stable/c/9afd605dcd96c7a45f338eded1de16679b30e1df","https://git.kernel.org/stable/c/5d4812668b03f823b5044789d6aa77fe56b42587","https://git.kernel.org/stable/c/906e410dcffbbd99fb4081abab817a830033aa28"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68217.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68217","state":"PUBLISHED","datePublished":"2026-08-10T12:00:36.773Z","dateUpdated":"2026-08-19T16:31:48.858Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.375Z"},"containers":{"cna":{"title":"media: pwc: Drain fill_buf on start_streaming() failure","descriptions":[{"lang":"en","value":"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/"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"97f3c15957ec7e6d249f05407ad947c0644df24d","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"a4afffd148991a826e8995362fb10cf8705c1130","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"eabe9a59640698137d7382d5b549e95dc37f7565","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"a56e7641e09bd80b976e944ae759109b86fd5b38","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"acc789b2173070638cad89c2b61d33ed338be0dd","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"9afd605dcd96c7a45f338eded1de16679b30e1df","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"5d4812668b03f823b5044789d6aa77fe56b42587","versionType":"git"},{"version":"885fe18f5542fe283a17f70583383c6cadcba1c3","status":"affected","lessThan":"906e410dcffbbd99fb4081abab817a830033aa28","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/usb/pwc/pwc-if.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.1","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/usb/pwc/pwc-if.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/97f3c15957ec7e6d249f05407ad947c0644df24d"},{"url":"https://git.kernel.org/stable/c/a4afffd148991a826e8995362fb10cf8705c1130"},{"url":"https://git.kernel.org/stable/c/eabe9a59640698137d7382d5b549e95dc37f7565"},{"url":"https://git.kernel.org/stable/c/a56e7641e09bd80b976e944ae759109b86fd5b38"},{"url":"https://git.kernel.org/stable/c/acc789b2173070638cad89c2b61d33ed338be0dd"},{"url":"https://git.kernel.org/stable/c/9afd605dcd96c7a45f338eded1de16679b30e1df"},{"url":"https://git.kernel.org/stable/c/5d4812668b03f823b5044789d6aa77fe56b42587"},{"url":"https://git.kernel.org/stable/c/906e410dcffbbd99fb4081abab817a830033aa28"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:31:48.858Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}