# usb: gadget: at91_udc: drain polled-VBUS timer/work before udc is freed

CVE record · `CVE-2026-89738`

- **Identifiers:** `CVE-2026-89738`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 2440ce54b8c4c8aa6963c181eb56164a466fbe1c` (git)
  - affected: `4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 1674e34fe61ad3f5585dc833ba6bb6522912e6a5` (git)
  - affected: `4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 723d73b245843d4fff4c3f42e857c78c2b2d414e` (git)
  - affected: `4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before a2a602cb1e28d76a5398cec3fa21b0110385f501` (git)
  - affected: `4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 51a311eb97e91ce1aed3005cb71ccb2e30f8cce8` (git)
  - affected: `4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before 557ef547d49ff5e6026a4d39bdd3113bd81d7688` (git)
  - affected: `4037242c4f5ff77afe61bf07ca1e8a99490219e5 to before c27d13ce4bab80fbdf6523928071b6c24b37606c` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.36`
  - unaffected: `before 2.6.36` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Linux kernel's at91_udc USB gadget driver, in polled-VBUS mode, can use a freed device structure: its VBUS timer and work item may still run after the driver is removed or probe fails. The source does not state which attacker position is needed or what effects are possible beyond the use-after-free. Upgrade to a fixed kernel version: the fixes are listed for the stable branches 5.15.224, 6.1.191, 6.6.160 and 6.12.109 and later, with the affected range starting at commit 4037242c4f5ff77afe61bf07ca1e8a99490219e5. No workaround is listed.

Written 12 Nov 2026.

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0019, the 8th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89738](https://www.cve.org/CVERecord?id=CVE-2026-89738)
- [NVD: CVE-2026-89738](https://nvd.nist.gov/vuln/detail/CVE-2026-89738)

### References from the CNA

- <https://git.kernel.org/stable/c/2440ce54b8c4c8aa6963c181eb56164a466fbe1c>
- <https://git.kernel.org/stable/c/1674e34fe61ad3f5585dc833ba6bb6522912e6a5>
- <https://git.kernel.org/stable/c/723d73b245843d4fff4c3f42e857c78c2b2d414e>
- <https://git.kernel.org/stable/c/a2a602cb1e28d76a5398cec3fa21b0110385f501>
- <https://git.kernel.org/stable/c/51a311eb97e91ce1aed3005cb71ccb2e30f8cce8>
- <https://git.kernel.org/stable/c/557ef547d49ff5e6026a4d39bdd3113bd81d7688>
- <https://git.kernel.org/stable/c/c27d13ce4bab80fbdf6523928071b6c24b37606c>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-89738>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89738/>. Everything for agents: <https://agentprime.io/llms.txt>.