CVE-2026-23275

A flaw was found in the Linux kernel's io_uring subsystem. This vulnerability occurs during the resizing of an io_uring ring when task work is added with specific flags (DEFER_TASKRUN or SETUP_TASKRUN). A race condition allows the IORING_SQ_TASKRUN flag to be set in an unstable memory region, which can lead to unpredictable system behavior or system instability.

This flaw affects io_uring applications using DEFER_TASKRUN mode with ring resizing. The race window exists between swapping to a new rings structure and freeing the old one, where task work can manipulate flags in freed memory. Exploiting this requires an application using the specific io_uring configuration and triggering ring resize operations concurrently with task work additions.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.