CVE-2026-45975 Details
Description
In the Linux kernel, the following vulnerability has been resolved: ublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd struct ublksrv_ctrl_cmd is part of the io_uring_sqe, which may lie in userspace-mapped memory. It's racy to access its fields with normal loads, as userspace may write to them concurrently. Use READ_ONCE() to copy the ublksrv_ctrl_cmd from the io_uring_sqe to the stack. Use the local copy in place of the one in the io_uring_sqe.
A race condition vulnerability has been addressed in the Linux kernel ublk driver, specifically in the handling of the ublksrv_ctrl_cmd structure, which is part of the io_uring_sqe and may reside in userspace-mapped memory. The vulnerability arises because the fields of this structure can be accessed with normal loads, creating a risk of concurrent writes from userspace. To mitigate this, the kernel now uses READ_ONCE() to safely copy the ublksrv_ctrl_cmd from the io_uring_sqe to the stack, where it can be safely accessed without interference from userspace. This vulnerability affects the Linux kernel ublk driver in the stable tree.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. The specific commit that resolves this issue is available in the Linux kernel stable tree.
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/ce63eda3e6d36e2c253febee1c8421ecbd1a680e | kernel.org | Patch |
| https://git.kernel.org/stable/c/ed9f54cc1e335096733aed03c2a46de3d58922ed | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.19, < 6.19.4 |
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 |
| Jun 16, 2026 | Initial Analysis | [email protected] |
| May 27, 2026 | New CVE Received | kernel.org |