CVE-2026-46127
Description
A flaw was found in the Linux kernel, specifically within the RDMA (Remote Direct Memory Access) ocrdma driver. This vulnerability arises from an uninitialized pointer in the ocrdma_copy_pd_uresp() function's error handling, which can lead to a NULL dereference. An attacker could exploit this to cause a system crash, resulting in a Denial of Service (DoS).
Statement
This Moderate-severity flaw in the Linux kernel's RDMA ocrdma driver can lead to a system crash and denial of service. The vulnerability, caused by an uninitialized pointer in error handling, requires local access to a system with the ocrdma driver loaded for exploitation. Red Hat Enterprise Linux 6 and 7 are affected.
Mitigation
To prevent the `ocrdma` kernel module from loading, blacklist it by creating a file `/etc/modprobe.d/blacklist-ocrdma.conf` with the content `blacklist ocrdma`. After saving the file, regenerate the initramfs using `dracut -f -v` and reboot the system for the changes to take effect. This action may affect functionality dependent on the ocrdma driver and RDMA hardware.
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
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the uninitialized pointer is used in a read operation, an attacker might be able to read sensitive portions of memory.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the uninitialized pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the uninitialized pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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