CVE-2026-92525
Description
A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) subsystem, specifically within the rxe component. A local, unprivileged user can exploit this vulnerability by submitting malformed work queue entries (WQE). This can lead to an out-of-bounds read operation, resulting in a system crash and a denial of service (DoS).
Statement
A vmalloc out-of-bounds read in the RDMA rxe requester path can occur because a user QP WQE is read from an mmap ring controlled by userspace and num_sge or cur_sge were not validated before indexing wqe dma sge in copy_data(). A local user with access to the rxe RDMA device can post a malformed WQE with an out-of-range cur_sge or oversized num_sge and trigger an invalid kernel read. For the CVSS the PR:L is used because triggering requires a local user or process with access to the RDMA userspace interface, but not full administrative privileges. The issue is not directly network reachable because the malformed state is supplied through the local user QP ring rather than by remote packets. Impact is at least local denial of service via kernel crash or KASAN-detected fault, with limited confidentiality impact considered in the paranoid score due to the concrete invalid read primitive.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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 | 7.1 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
An attacker could provide unexpected values and cause a program crash or arbitrary control of resource allocation, leading to excessive consumption of resources such as memory and CPU.
Confidentiality
Technical Impact: Read Memory; Read Files or Directories
An attacker could read confidential data if they are able to control resource references.
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
An attacker could use malicious input to modify data or possibly alter control flow in unexpected ways, including arbitrary command execution.
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