# CVE-2026-68410: wifi: libertas: fix memory leak in helper_firmware_cb()

Status: published. Published: 2026-08-10. Updated: 2026-11-06.

In the Linux kernel, the following vulnerability has been resolved:

wifi: libertas: fix memory leak in helper_firmware_cb()

helper_firmware_cb() neglects to free the single-stage firmware image
after a successful async load, leading to a memory leak in the USB
firmware-download path.

Fix this memory leak by calling release_firmware() immediately after
lbs_fw_loaded() returns.

The bug was first flagged by an experimental analysis tool we are
developing for kernel memory-management bugs while analyzing
v6.13-rc1. The tool is still under development and is not yet publicly
available. Manual inspection confirms that the bug is still present in
the current wireless tree.

An x86_64 allyesconfig build showed no new warnings. As we do not have
compatible Libertas USB hardware for exercising this firmware-download
path, no runtime testing was able to be performed.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 1dfba3060fe7ee03ccec25a91d35085142dfc295; < 6c1f54a04813676c5a2150d99331c8d21f199374 (affected, git); ≥ 1dfba3060fe7ee03ccec25a91d35085142dfc295; < 7f28722b3e4e0c8d49c859fea4a9b1fa13b5ae06 (affected, git); ≥ 1dfba3060fe7ee03ccec25a91d35085142dfc295; < ce829286f4935f1eb6b5dcb64da02910ce149c76 (affected, git); ≥ 1dfba3060fe7ee03ccec25a91d35085142dfc295; < d497b7566e74920acfe283dd6b2cbf1682890796 (affected, git); ≥ 1dfba3060fe7ee03ccec25a91d35085142dfc295; < eaeb1d74a47fc4864f2c754c0b9d654a9b7dc55c (affected, git); ≥ 1dfba3060fe7ee03ccec25a91d35085142dfc295; < 6cda91bbb8dc3d22ef0323008a12dcf73a5129da (affected, git); ≥ 1dfba3060fe7ee03ccec25a91d35085142dfc295; < 644640cde2fb216e6567de5eee780a38dbc95928 (affected, git); ≥ 1dfba3060fe7ee03ccec25a91d35085142dfc295; < 63c2391deefb31e1b801b7f32bd502ca4808639b (affected, git). Source: CNA: Linux
- Linux / Linux: 3.13 (affected); ≥ 0; < 3.13 (unaffected, semver); ≥ 5.10.265; ≤ 5.10.* (unaffected, semver); ≥ 5.15.216; ≤ 5.15.* (unaffected, semver); ≥ 6.1.183; ≤ 6.1.* (unaffected, semver); ≥ 6.6.148; ≤ 6.6.* (unaffected, semver); ≥ 6.12.101; ≤ 6.12.* (unaffected, semver); ≥ 6.18.42; ≤ 6.18.* (unaffected, semver); ≥ 7.1.6; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-06; percentile 12.14%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/6c1f54a04813676c5a2150d99331c8d21f199374 (CNA: Linux)

- https://git.kernel.org/stable/c/7f28722b3e4e0c8d49c859fea4a9b1fa13b5ae06 (CNA: Linux)

- https://git.kernel.org/stable/c/ce829286f4935f1eb6b5dcb64da02910ce149c76 (CNA: Linux)

- https://git.kernel.org/stable/c/d497b7566e74920acfe283dd6b2cbf1682890796 (CNA: Linux)

- https://git.kernel.org/stable/c/eaeb1d74a47fc4864f2c754c0b9d654a9b7dc55c (CNA: Linux)

- https://git.kernel.org/stable/c/6cda91bbb8dc3d22ef0323008a12dcf73a5129da (CNA: Linux)

- https://git.kernel.org/stable/c/644640cde2fb216e6567de5eee780a38dbc95928 (CNA: Linux)

- https://git.kernel.org/stable/c/63c2391deefb31e1b801b7f32bd502ca4808639b (CNA: Linux)

- https://git.kernel.org/stable/c/63c2391deefb31e1b801b7f32bd502ca4808639b (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/644640cde2fb216e6567de5eee780a38dbc95928 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/6c1f54a04813676c5a2150d99331c8d21f199374 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/6cda91bbb8dc3d22ef0323008a12dcf73a5129da (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7f28722b3e4e0c8d49c859fea4a9b1fa13b5ae06 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/ce829286f4935f1eb6b5dcb64da02910ce149c76 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/d497b7566e74920acfe283dd6b2cbf1682890796 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/eaeb1d74a47fc4864f2c754c0b9d654a9b7dc55c (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-68410; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68410; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-68410; retrieved 2026-11-06; source updated Not reported

Revision: be3ad4fd038f2f8e4a4b50b797233dcc5d012c08dc4c74cf0d9cd194f3bf333c

Canonical: https://y2.dev/cve/CVE-2026-68410

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