Linux Kernel up to 6.12.108/6.18.49/7.2.3 UVC Gadget Driver uvc_function_bind/uvc_function_unbind control_req/control_buf use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.6$5k-$25k0.00+

Summaryinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 6.12.108/6.18.49/7.2.3. Impacted is the function uvc_function_bind/uvc_function_unbind of the component UVC Gadget Driver. This manipulation of the argument control_req/control_buf causes use after free. This vulnerability appears as CVE-2026-89733. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.12.108/6.18.49/7.2.3 and classified as very critical. Affected by this vulnerability is the function uvc_function_bind/uvc_function_unbind of the component UVC Gadget Driver. The manipulation of the argument control_req/control_buf with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-89733 since 09/11/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/11/2026).

Upgrading to version 6.12.109, 6.18.50, 7.2.4 or 7.3-rc1 eliminates this vulnerability. Applying the patch 8e88ed8a374de67270d38689f2a81018909cafbb/9897b7da8c0ad8356c1b8649379fcb5a689462cb/38f822ddce9355893d734279a26ddec45182197e/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.0
VulDB Meta Temp Score: 8.6

VulDB Base Score: 9.0
VulDB Temp Score: 8.6
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 6.12.109/6.18.50/7.2.4/7.3-rc1
Patch: 8e88ed8a374de67270d38689f2a81018909cafbb/9897b7da8c0ad8356c1b8649379fcb5a689462cb/38f822ddce9355893d734279a26ddec45182197e/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc

Timelineinfo

09/11/2026 Advisory disclosed
09/11/2026 +0 days CVE reserved
09/11/2026 +0 days VulDB entry created
09/11/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-89733 (🔒)
GCVE (CVE): GCVE-0-2026-89733
GCVE (VulDB): GCVE-100-402583

Entryinfo

Created: 09/11/2026 22:38
Changes: 09/11/2026 22:38 (60)
Complete: 🔍
Cache ID: 216::103

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