CVE-2026-90009

7.8 HIGH

Published 2026-09-16 · Updated 2026-09-16

AI risk analysis

Summary: This vulnerability allows a malicious user to exploit a time-of-check to time-of-use race condition in the io_uring passthrough command setup, potentially leading to buffer overflow and code execution.
Exploitability: Exploitation requires a race condition between checking and using a field in the SQE, making it moderately difficult. Precondition is the ability to manipulate the SQE after the initial check.
Blast radius: If exploited, the impact could be severe, potentially leading to arbitrary code execution with kernel privileges.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the fixed version 5.19.1 or later.

rcekernelbuffer-overflow

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

In the Linux kernel, the following vulnerability has been resolved: scsi: bsg: Fix TOCTOU in io_uring passthrough command setup scsi_bsg_uring_cmd() reads bsg_uring_cmd from the shared mmap'd SQE. Userspace can change a field after we check it and before we use it. request_len is the sharp case: it can grow past sizeof(scmd->cmnd) after the bound check and overflow scmd->cmnd in copy_from_user(). READ_ONCE() the SQE fields we check or use into locals before use.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.