CVE-2026-45975
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
A vulnerability has been identified in the Linux kernel related to accessing the ublksrv_ctrl_cmd structure, which may reside in userspace-mapped memory. The issue involves a race condition when reading its fields, potentially leading to unpredictable behavior.
Risk Assessment
Accessing the structure's fields by multiple threads may result in application errors and potential security vulnerabilities, threatening system integrity.
Recommendation
It is recommended to update the Linux kernel to the latest version that implements READ_ONCE() for safe reading of the ublksrv_ctrl_cmd structure.
Original NVD description (English source)
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.