Linux Kernel up to 7.2-rc3 libertas_tf lbtf_free_adapter use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.00+

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 6.6.147/6.12.100/6.18.39/7.1.4/7.2-rc3. The impacted element is the function lbtf_free_adapter of the component libertas_tf. The manipulation leads to use after free. This vulnerability is referenced as CVE-2026-72070. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 6.6.147/6.12.100/6.18.39/7.1.4/7.2-rc3. This issue affects the function lbtf_free_adapter of the component libertas_tf. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-72070 since 08/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 6.6.148, 6.12.101, 6.18.40, 7.1.5 or 7.2-rc4 eliminates this vulnerability. Applying the patch 4714e95f5d61cb9c5c7c6c4e68b618f37bc6ffcf/066b59e84f90d270cc15f0370166155aca507630/fcff712d0e3d183843ec3916470ee6cc3455baad/bcf7968cb97ce4312588042cf2712f04caff6d8f/aa6dcd5c8dd9ba1d7d0f60093bcda41c0d6d438d is able to eliminate this problem.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.148/6.12.101/6.18.40/7.1.5/7.2-rc4
Patch: 4714e95f5d61cb9c5c7c6c4e68b618f37bc6ffcf/066b59e84f90d270cc15f0370166155aca507630/fcff712d0e3d183843ec3916470ee6cc3455baad/bcf7968cb97ce4312588042cf2712f04caff6d8f/aa6dcd5c8dd9ba1d7d0f60093bcda41c0d6d438d

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72070 (🔒)
GCVE (CVE): GCVE-0-2026-72070
GCVE (VulDB): GCVE-100-390485

Entryinfo

Created: 08/15/2026 11:49
Changes: 08/15/2026 11:49 (59)
Complete: 🔍
Cache ID: 216::103

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