CVE-2026-23275
Description
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.
Statement
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.7 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity,Other
Technical Impact: Alter Execution Logic; Unexpected State
The main problem is that -- if a lock is overcome -- data could be altered in a bad state.
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