Linux Kernel up to 6.12.108/6.18.49/7.2.3 i3c i3c_master_unregister_i3c_devs information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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2.2$0-$5k0.00+

Summaryinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 6.12.108/6.18.49/7.2.3. This impacts the function i3c_master_unregister_i3c_devs of the component i3c. The manipulation leads to information disclosure. This vulnerability is listed as CVE-2026-80952. The attack must be carried out locally. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 6.12.108/6.18.49/7.2.3. This issue affects the function i3c_master_unregister_i3c_devs of the component i3c. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: i3c: master: Fix info leak and UAF in device unregister path i3c_master_unregister_i3c_devs() clears i3cdev->dev->desc before calling device_unregister(). During device_unregister(), device_del() emits a KOBJ_REMOVE uevent and unbinds the driver while the device descriptor is still expected to be valid. As a result, i3c_device_uevent() and a racing modalias_show() can observe a NULL desc and fall back to an uninitialized stack struct i3c_device_info, leaking kernel stack contents in the generated modalias. Driver .remove() callbacks may also encounter an unexpected NULL desc during unbind. Keep desc valid until device_unregister() has completed. Since device_unregister() drops the device reference and may free the device, take an extra reference with get_device() before unregistering. Clear desc afterwards and release the extra reference with put_device(). This preserves the release-time invariant that desc must be NULL while avoiding both the information leak and a potential use-after-free from writing desc after the device has been released.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-80952 since 08/26/2026. The exploitation is known to be easy. An attack has to be approached locally. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 6.12.109, 6.18.50, 7.2.4 or 7.3-rc1 eliminates this vulnerability. Applying the patch c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49/94fb9786d67a8f8b899e77381620f86bad94fdf7/4837be0f9ac2efe5e83b35a696b6242c473d280c/d2c743efd2d1ee64e94324664808f623dd865872 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: 2.3
VulDB Meta Temp Score: 2.2

VulDB Base Score: 2.3
VulDB Temp Score: 2.2
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: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

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: c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49/94fb9786d67a8f8b899e77381620f86bad94fdf7/4837be0f9ac2efe5e83b35a696b6242c473d280c/d2c743efd2d1ee64e94324664808f623dd865872

Timelineinfo

08/26/2026 CVE reserved
09/11/2026 +16 days Advisory disclosed
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-2026-80952 (🔒)
GCVE (CVE): GCVE-0-2026-80952
GCVE (VulDB): GCVE-100-402653

Entryinfo

Created: 09/11/2026 23:22
Changes: 09/11/2026 23:22 (59)
Complete: 🔍
Cache ID: 216::103

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