# CVE-2026-72070: wifi: libertas_tf: fix use-after-free in lbtf_free_adapter()

Status: published. Published: 2026-08-15. Updated: 2026-11-06.

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

wifi: libertas_tf: fix use-after-free in lbtf_free_adapter()

lbtf_free_adapter() calls timer_delete(&priv->command_timer), which does
not wait for a running command_timer_fn() callback. lbtf_free_adapter()
runs on the teardown path right before ieee80211_free_hw() frees priv,
both in lbtf_remove_card() and in the probe error path. command_timer is
armed by mod_timer() in lbtf_cmd() whenever a firmware command is sent.
command_timer_fn() dereferences priv. If a command times out as the
device is removed, command_timer_fn() runs concurrently with teardown and
dereferences priv after it has been freed.

This is the same use-after-free that commit 03cc8f90d053 ("wifi: libertas:
fix use-after-free in lbs_free_adapter()") fixed in the sibling libertas
driver. The libertas_tf variant has the identical pattern and was left
unchanged. Use timer_delete_sync() so any in-flight callback completes
before priv is freed.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 06b16ae5319251c26377afcb401e46056d5673f4; < bd75636681588c67006279abdb9a76a708b3ce29 (affected, git); ≥ 06b16ae5319251c26377afcb401e46056d5673f4; < 2fba1d3b2f031a2c68e566a6d45cc5b7a8d6683d (affected, git); ≥ 06b16ae5319251c26377afcb401e46056d5673f4; < 9392fd5de555272449d3d8c63410ea00f8ec853a (affected, git); ≥ 06b16ae5319251c26377afcb401e46056d5673f4; < 4714e95f5d61cb9c5c7c6c4e68b618f37bc6ffcf (affected, git); ≥ 06b16ae5319251c26377afcb401e46056d5673f4; < 066b59e84f90d270cc15f0370166155aca507630 (affected, git); ≥ 06b16ae5319251c26377afcb401e46056d5673f4; < fcff712d0e3d183843ec3916470ee6cc3455baad (affected, git); ≥ 06b16ae5319251c26377afcb401e46056d5673f4; < bcf7968cb97ce4312588042cf2712f04caff6d8f (affected, git); ≥ 06b16ae5319251c26377afcb401e46056d5673f4; < aa6dcd5c8dd9ba1d7d0f60093bcda41c0d6d438d (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.28 (affected); ≥ 0; < 2.6.28 (unaffected, semver); ≥ 5.10.266; ≤ 5.10.* (unaffected, semver); ≥ 5.15.217; ≤ 5.15.* (unaffected, semver); ≥ 6.1.184; ≤ 6.1.* (unaffected, semver); ≥ 6.6.148; ≤ 6.6.* (unaffected, semver); ≥ 6.12.101; ≤ 6.12.* (unaffected, semver); ≥ 6.18.40; ≤ 6.18.* (unaffected, semver); ≥ 7.1.5; ≤ 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 12.60%

- 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/bd75636681588c67006279abdb9a76a708b3ce29 (CNA: Linux)

- https://git.kernel.org/stable/c/2fba1d3b2f031a2c68e566a6d45cc5b7a8d6683d (CNA: Linux)

- https://git.kernel.org/stable/c/9392fd5de555272449d3d8c63410ea00f8ec853a (CNA: Linux)

- https://git.kernel.org/stable/c/4714e95f5d61cb9c5c7c6c4e68b618f37bc6ffcf (CNA: Linux)

- https://git.kernel.org/stable/c/066b59e84f90d270cc15f0370166155aca507630 (CNA: Linux)

- https://git.kernel.org/stable/c/fcff712d0e3d183843ec3916470ee6cc3455baad (CNA: Linux)

- https://git.kernel.org/stable/c/bcf7968cb97ce4312588042cf2712f04caff6d8f (CNA: Linux)

- https://git.kernel.org/stable/c/aa6dcd5c8dd9ba1d7d0f60093bcda41c0d6d438d (CNA: Linux)

- https://git.kernel.org/stable/c/066b59e84f90d270cc15f0370166155aca507630 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/2fba1d3b2f031a2c68e566a6d45cc5b7a8d6683d (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/4714e95f5d61cb9c5c7c6c4e68b618f37bc6ffcf (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/9392fd5de555272449d3d8c63410ea00f8ec853a (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/aa6dcd5c8dd9ba1d7d0f60093bcda41c0d6d438d (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/bcf7968cb97ce4312588042cf2712f04caff6d8f (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/bd75636681588c67006279abdb9a76a708b3ce29 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/fcff712d0e3d183843ec3916470ee6cc3455baad (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-72070; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72070; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-72070; retrieved 2026-11-06; source updated Not reported

Revision: 915fec3275c3e6856d77d274e9b6d0ebd387a67bfe28e6b94a9d6caf68e0db94

Canonical: https://y2.dev/cve/CVE-2026-72070

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