{"api_version":"1","generated_at":"2026-08-12T02:25:26+00:00","cve":"CVE-2026-68217","urls":{"html":"https://cve.report/CVE-2026-68217","api":"https://cve.report/api/cve/CVE-2026-68217.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68217","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68217"},"summary":{"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/","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-10 13:20:09","updated_at":"2026-08-10 13:20:09"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/906e410dcffbbd99fb4081abab817a830033aa28","name":"https://git.kernel.org/stable/c/906e410dcffbbd99fb4081abab817a830033aa28","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/acc789b2173070638cad89c2b61d33ed338be0dd","name":"https://git.kernel.org/stable/c/acc789b2173070638cad89c2b61d33ed338be0dd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5d4812668b03f823b5044789d6aa77fe56b42587","name":"https://git.kernel.org/stable/c/5d4812668b03f823b5044789d6aa77fe56b42587","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a56e7641e09bd80b976e944ae759109b86fd5b38","name":"https://git.kernel.org/stable/c/a56e7641e09bd80b976e944ae759109b86fd5b38","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9afd605dcd96c7a45f338eded1de16679b30e1df","name":"https://git.kernel.org/stable/c/9afd605dcd96c7a45f338eded1de16679b30e1df","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68217","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68217","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 885fe18f5542fe283a17f70583383c6cadcba1c3 a56e7641e09bd80b976e944ae759109b86fd5b38 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 885fe18f5542fe283a17f70583383c6cadcba1c3 acc789b2173070638cad89c2b61d33ed338be0dd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 885fe18f5542fe283a17f70583383c6cadcba1c3 9afd605dcd96c7a45f338eded1de16679b30e1df git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 885fe18f5542fe283a17f70583383c6cadcba1c3 5d4812668b03f823b5044789d6aa77fe56b42587 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 885fe18f5542fe283a17f70583383c6cadcba1c3 906e410dcffbbd99fb4081abab817a830033aa28 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/media/usb/pwc/pwc-if.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a56e7641e09bd80b976e944ae759109b86fd5b38","status":"affected","version":"885fe18f5542fe283a17f70583383c6cadcba1c3","versionType":"git"},{"lessThan":"acc789b2173070638cad89c2b61d33ed338be0dd","status":"affected","version":"885fe18f5542fe283a17f70583383c6cadcba1c3","versionType":"git"},{"lessThan":"9afd605dcd96c7a45f338eded1de16679b30e1df","status":"affected","version":"885fe18f5542fe283a17f70583383c6cadcba1c3","versionType":"git"},{"lessThan":"5d4812668b03f823b5044789d6aa77fe56b42587","status":"affected","version":"885fe18f5542fe283a17f70583383c6cadcba1c3","versionType":"git"},{"lessThan":"906e410dcffbbd99fb4081abab817a830033aa28","status":"affected","version":"885fe18f5542fe283a17f70583383c6cadcba1c3","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/media/usb/pwc/pwc-if.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.1"},{"lessThan":"3.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.101","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.42","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.148","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.101","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.42","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"3.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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/"}],"providerMetadata":{"dateUpdated":"2026-08-10T12:00:36.773Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}],"title":"media: pwc: Drain fill_buf on start_streaming() failure","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68217","datePublished":"2026-08-10T12:00:36.773Z","dateReserved":"2026-07-30T09:28:09.375Z","dateUpdated":"2026-08-10T12:00:36.773Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-10 13:20:09","lastModifiedDate":"2026-08-10 13:20:09","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68217","Ordinal":"1","Title":"media: pwc: Drain fill_buf on start_streaming() failure","CVE":"CVE-2026-68217","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68217","Ordinal":"1","NoteData":"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/","Type":"Description","Title":"media: pwc: Drain fill_buf on start_streaming() failure"}]}}}