# usb: gadget: f_fs: Fix Use-After-Free in AIO error path

CVE record · `CVE-2026-90044`

- **Identifiers:** `CVE-2026-90044`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:33 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: `de2080d41b5d584205e408d72021f0f335a046fc to before 922a29e1f8573fd405eea1a73a52112c4e7fcfc4` (git)
  - affected: `de2080d41b5d584205e408d72021f0f335a046fc to before 0a2f71ccf9c2053de725e9a7922d081f3f3a3804` (git)
  - affected: `de2080d41b5d584205e408d72021f0f335a046fc to before b5f0e80a03e87bd932487e03248eae3ba3ed7b45` (git)
  - affected: `de2080d41b5d584205e408d72021f0f335a046fc to before 153b5ecd29ed055562400bc17c91df3fd869b0ce` (git)
  - affected: `de2080d41b5d584205e408d72021f0f335a046fc to before 4a2fb2d12b87b43724230abb52a1440617c7b6cc` (git)
  - affected: `de2080d41b5d584205e408d72021f0f335a046fc to before e78dcb1f7ec271449c54984dc90c62a5ba272de7` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.0`
  - unaffected: `before 4.0` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 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.

> The Linux kernel USB gadget FunctionFS (f_fs) driver is affected starting with 4.0, and the fixed stable releases are 6.1.191, 6.6.160, 6.12.111, and 6.18.51 or later in each series. A local user who can issue asynchronous I/O on a FunctionFS endpoint can race a cancel request against an error path, causing a use-after-free. Upgrade to a fixed version; the source lists no workaround.

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:** 0.0017, the 6th percentile, on 13 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90044](https://www.cve.org/CVERecord?id=CVE-2026-90044)
- [NVD: CVE-2026-90044](https://nvd.nist.gov/vuln/detail/CVE-2026-90044)

### References from the CNA

- <https://git.kernel.org/stable/c/922a29e1f8573fd405eea1a73a52112c4e7fcfc4>
- <https://git.kernel.org/stable/c/0a2f71ccf9c2053de725e9a7922d081f3f3a3804>
- <https://git.kernel.org/stable/c/b5f0e80a03e87bd932487e03248eae3ba3ed7b45>
- <https://git.kernel.org/stable/c/153b5ecd29ed055562400bc17c91df3fd869b0ce>
- <https://git.kernel.org/stable/c/4a2fb2d12b87b43724230abb52a1440617c7b6cc>
- <https://git.kernel.org/stable/c/e78dcb1f7ec271449c54984dc90c62a5ba272de7>

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-2026-90044>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90044/>. Everything for agents: <https://agentprime.io/llms.txt>.