CVE-2026-23282
Description
A flaw was found in the Linux kernel's Server Message Block (SMB) client. This vulnerability occurs when the SMB client fails to properly initialize variables during certain connection operations, such as reconnecting. An uninitialized variable can then be used, leading to a kernel panic and causing a Denial of Service (DoS) on the affected system. A remote attacker could potentially trigger this flaw.
Statement
This flaw affects systems using the SMB/CIFS client for network file sharing. When SMB2_open_init() or SMB2_close_init() fails during operations like reconnection, uninitialized iovec structures are used in subsequent calls, causing a kernel crash. The vulnerability can be triggered by network conditions that cause SMB reconnection failures.
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 | 5.5 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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