CVE-2026-31650 Details
Description
In the Linux kernel, the following vulnerability has been resolved: mmc: vub300: fix use-after-free on disconnect The vub300 driver maintains an explicit reference count for the controller and its driver data and the last reference can in theory be dropped after the driver has been unbound. This specifically means that the controller allocation must not be device managed as that can lead to use-after-free. Note that the lifetime is currently also incorrectly tied the parent USB device rather than interface, which can lead to memory leaks if the driver is unbound without its device being physically disconnected (e.g. on probe deferral). Fix both issues by reverting to non-managed allocation of the controller.
A use-after-free vulnerability has been identified in the VUB300 driver of the Linux kernel. This issue arises because the driver manages an explicit reference count for the controller and its associated data, allowing the last reference to be dropped after the driver is unbound. The vulnerability is exacerbated by the fact that the controller allocation is improperly device-managed, leading to potential memory access errors. Additionally, the driver's lifecycle is incorrectly linked to the parent USB device instead of the interface, which can cause memory leaks if the driver is unbound without physically disconnecting the device. The vulnerability affects Linux kernel versions 6.17 and later.
Users can apply the latest patches available in the Linux kernel stable tree to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/8f4d20a710225ec7a565f6a0459862d3b1f32330 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ea7468f61be033f4e18b95f2912010ed1d175d75 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ef0448c569b37ceabdd038e9faa311e5179127b0 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.17.1, < 6.18.23 >= 6.19, < 6.19.13 6.17 - 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 7.0 rc7 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Apr 27, 2026 | Initial Analysis | [email protected] |
| Apr 24, 2026 | New CVE Received | kernel.org |