CVE-2026-89969
Description
A flaw was found in the nvmet-tcp component of the Linux kernel. A remote, unauthenticated attacker can exploit an out-of-bounds write vulnerability by sending a specially crafted, over-long Protocol Data Unit (PDU) during connection setup. This can lead to the corruption of adjacent kernel memory, potentially allowing for arbitrary code execution or causing a system crash (Denial of Service).
Statement
This flaw is rated as Moderate severity because it requires an explicit, non-default configuration as an NVMe over Fabrics target to expose the vulnerable TCP transport service. By default, Red Hat Enterprise Linux does not load the nvmet-tcp driver or listen for incoming NVMe-oF network connections. Consequently, typical deployments remain unexposed unless an administrator specifically enables storage target services on untrusted networks.
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 | 7 | N/A | 9.8 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | 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:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
Frequently Asked Questions
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