CVE-2026-23059
Description
A buffer overflow vulnerability was found in the Linux kernel's QLogic qla2xxx Fibre Channel driver. The qla27xx_copy_fpin_pkt() and qla27xx_copy_multiple_pkt() functions use firmware-reported frame_size to calculate copy length into item->iocb, a fixed 64-byte array. When frame_size exceeds 64 bytes, the memcpy operations overflow the iocb member boundary, writing into adjacent structure members.
Statement
This flaw affects systems with QLogic Fibre Channel HBAs using the qla2xxx driver. The overflow is triggered by malformed firmware responses containing oversized frame_size values. While CONFIG_FORTIFY_SOURCE detects and warns about the cross-member write, the practical security impact depends on what data overwrites adjacent structure members and whether attackers can control firmware responses.
Mitigation
To mitigate this issue, prevent the qla2xxx module from being loaded if QLogic Fibre Channel adapters are not required. See https://access.redhat.com/solutions/41278 for instructions on how to blacklist a kernel module.
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 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of the product's implicit security policy. This can often be used to subvert any other security service.
Availability
Technical Impact: Modify Memory; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU)
Buffer overflows generally lead to crashes. Other attacks leading to lack of availability are possible, including putting the product into an infinite loop.
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