Linux Kernel up to 7.2.5 f_uac1_legacy null pointer dereference

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.0$0-$5k0.00-

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been rated as critical. This issue affects some unknown processing of the component f_uac1_legacy. Performing a manipulation results in null pointer dereference. This vulnerability is cataloged as CVE-2026-93056. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 7.2.5. This affects an unknown function of the component f_uac1_legacy. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_uac1_legacy: remove broken string configfs attributes The UAC1_STR_ATTRIBUTE macro defines configfs show/store handlers for the fn_play, fn_cap, and fn_cntl string options. The store function contains an inverted null check on the kstrndup() return value. This means every write attempt returns -ENOMEM on success and dereferences a NULL pointer on allocation failure. The attributes have been broken and unused for many years. Remove the UAC1_STR_ATTRIBUTE macro and the three attributes it generated. The internal defaults (FILE_PCM_PLAYBACK, FILE_PCM_CAPTURE, FILE_CONTROL) set in f_audio_alloc_inst() are unaffected.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-93056 since 09/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 745adfe6c337f3d5d7737d57529d14a208151b45/6351ba62778f72dc4f6bc18bfa99e618829cff0d/fd43eae7d539ea7cfc7c9f0d3f0eaa890415e8a7/8b9335aec93975bb9186d63993a5a610e5066ffc/2ed25c9d4400cf90d9201657963a231c27a5ea57/977659adb341f6e30fb00dcf183f63f29df879e2/590d74ec8f488e06b9f1c0f8f0941f45531f3a55 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
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: Null pointer dereference
CWE: CWE-476 / CWE-404
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 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 745adfe6c337f3d5d7737d57529d14a208151b45/6351ba62778f72dc4f6bc18bfa99e618829cff0d/fd43eae7d539ea7cfc7c9f0d3f0eaa890415e8a7/8b9335aec93975bb9186d63993a5a610e5066ffc/2ed25c9d4400cf90d9201657963a231c27a5ea57/977659adb341f6e30fb00dcf183f63f29df879e2/590d74ec8f488e06b9f1c0f8f0941f45531f3a55

Timelineinfo

09/17/2026 Advisory disclosed
09/17/2026 +0 days CVE reserved
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-93056 (🔒)
GCVE (CVE): GCVE-0-2026-93056
GCVE (VulDB): GCVE-100-407169

Entryinfo

Created: 09/17/2026 23:33
Changes: 09/17/2026 23:33 (58)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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