CVE-2026-68217 (GCVE-0-2026-68217)
Vulnerability from cvelistv5
Published
2026-08-10 12:00
Modified
2026-08-19 16:31
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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/
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 885fe18f5542fe283a17f70583383c6cadcba1c3 Version: 885fe18f5542fe283a17f70583383c6cadcba1c3 Version: 885fe18f5542fe283a17f70583383c6cadcba1c3 Version: 885fe18f5542fe283a17f70583383c6cadcba1c3 Version: 885fe18f5542fe283a17f70583383c6cadcba1c3 Version: 885fe18f5542fe283a17f70583383c6cadcba1c3 Version: 885fe18f5542fe283a17f70583383c6cadcba1c3 Version: 885fe18f5542fe283a17f70583383c6cadcba1c3 |
||
{
"containers": {
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"programFiles": [
"drivers/media/usb/pwc/pwc-if.c"
],
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],
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"versions": [
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},
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
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},
{
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"status": "unaffected",
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},
{
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"status": "unaffected",
"version": "6.1.183",
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},
{
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"version": "6.6.148",
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},
{
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"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.18.42",
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},
{
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"status": "unaffected",
"version": "7.1.6",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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}
],
"negate": false,
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],
"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-\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/"
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:31:48.858Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"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": "2026-08-19T16:31:48.858Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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