CVE-2026-68217
media: pwc: Drain fill_buf on start_streaming() failure
Description
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/
INFO
Published Date :
Aug. 10, 2026, 1:20 p.m.
Last Modified :
Aug. 17, 2026, 5:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to include the fix.
- Ensure the fill buffer is drained on error.
- Test streaming functionality after update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-68217.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68217 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-68217
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-68217 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68217 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': 'a56e7641e09bd80b976e944ae759109b86fd5b38', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': 'acc789b2173070638cad89c2b61d33ed338be0dd', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': '9afd605dcd96c7a45f338eded1de16679b30e1df', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': '5d4812668b03f823b5044789d6aa77fe56b42587', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': '906e410dcffbbd99fb4081abab817a830033aa28', 'versionType': 'git'}], 'programFiles': ['drivers/media/usb/pwc/pwc-if.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/media/usb/pwc/pwc-if.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': 'a56e7641e09bd80b976e944ae759109b86fd5b38', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': 'acc789b2173070638cad89c2b61d33ed338be0dd', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': '9afd605dcd96c7a45f338eded1de16679b30e1df', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': '5d4812668b03f823b5044789d6aa77fe56b42587', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': '906e410dcffbbd99fb4081abab817a830033aa28', 'versionType': 'git'}], 'programFiles': ['drivers/media/usb/pwc/pwc-if.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/media/usb/pwc/pwc-if.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 10, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': 'a56e7641e09bd80b976e944ae759109b86fd5b38', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': 'acc789b2173070638cad89c2b61d33ed338be0dd', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': '9afd605dcd96c7a45f338eded1de16679b30e1df', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': '5d4812668b03f823b5044789d6aa77fe56b42587', 'versionType': 'git'}, {'status': 'affected', 'version': '885fe18f5542fe283a17f70583383c6cadcba1c3', 'lessThan': '906e410dcffbbd99fb4081abab817a830033aa28', 'versionType': 'git'}], 'programFiles': ['drivers/media/usb/pwc/pwc-if.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/media/usb/pwc/pwc-if.c'], 'defaultStatus': 'affected'}] Added Description 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/ Added Reference https://git.kernel.org/stable/c/5d4812668b03f823b5044789d6aa77fe56b42587 Added Reference https://git.kernel.org/stable/c/906e410dcffbbd99fb4081abab817a830033aa28 Added Reference https://git.kernel.org/stable/c/9afd605dcd96c7a45f338eded1de16679b30e1df Added Reference https://git.kernel.org/stable/c/a56e7641e09bd80b976e944ae759109b86fd5b38 Added Reference https://git.kernel.org/stable/c/acc789b2173070638cad89c2b61d33ed338be0dd