CVE-2026-31565
Description
A flaw was found in the Linux kernel's RDMA/irdma component. A local user can trigger a deadlock by performing a network device (netdev) reset while Remote Direct Memory Access (RDMA) applications are actively running, particularly in iWARP mode. This action creates a circular dependency during the removal of RDMA clients, causing an indefinite wait. This vulnerability can lead to a Denial of Service (DoS) condition, making the system unresponsive.
Statement
A Moderate severity flaw was identified in the Linux kernel's RDMA/irdma component. This issue allows a local attacker to induce a denial of service by initiating a network device reset while RDMA applications are actively utilizing iWARP mode. This specific interaction can lead to a kernel deadlock, rendering the system unresponsive.
Mitigation
To mitigate this issue, if RDMA functionality is not required, the `irdma` kernel module can be blacklisted to prevent it from loading. This will disable RDMA capabilities provided by the `irdma` driver.
1. Create a file named `/etc/modprobe.d/blacklist-irdma.conf` with the following content:
blacklist irdma2. Regenerate the initramfs to ensure the blacklist takes effect on boot. For Red Hat Enterprise Linux 8 and 9, use `dracut -f -v`. For Red Hat Enterprise Linux 7, use `dracut -f`.
3. A system reboot is required for these changes to take full effect.
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)
Availability
Technical Impact: DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
An adversary that can cause a resource counter to become inaccurate may be able to create situations where resources are not accounted for and not released, thus causing resources to become scarce for future needs.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An adversary that can cause a resource counter to become inaccurate may be able to force an error that causes the product to crash or exit out of its current operation.
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