CVE-2026-68418
Received Received - Intake

RDMA Null Pointer Dereference in Linux Kernel

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Prevent user-triggered null deref on QP create Previously, the user QP creation path would only attempt to populate iwqp->iwpbl if the user-provided req.user_wqe_bufs field was non-zero. The problem is that iwqp->iwpbl is unconditionally dereferenced later on in irdma_setup_virt_qp. While there was a check for iwqp->iwpbl != NULL, this check would only occur if req.user_wqe_bufs was non-zero. The end result is that a user could send a zero user_wqe_bufs value and trigger a null ptr deref. Fix this by unconditionally calling irdma_get_pbl and bailing if it fails, similar to the CQ and SRQ paths.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68418
EUVD
EUVD-2026-55604

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a null pointer dereference vulnerability in the Linux kernel's RDMA subsystem, specifically in the irdma driver. It occurs during user-triggered Queue Pair (QP) creation when a user provides a zero value for user_wqe_bufs. The code attempts to dereference a pointer that remains null, leading to a crash.

Detection Guidance

This vulnerability is specific to the Linux kernel's RDMA/irdma driver and requires kernel-level access to detect. There are no direct network commands to detect it. Check if your system uses the affected kernel components by examining loaded modules and kernel version. Commands like 'lsmod | grep irdma' or 'uname -a' may help identify exposure.

Impact Analysis

An attacker with local access could exploit this to cause a denial of service by crashing the system. It requires user interaction but could lead to system instability or unexpected behavior in systems using the affected RDMA driver.

Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this vulnerability. If immediate patching is not possible, consider disabling the RDMA/irdma driver if not in use. Monitor vendor advisories for kernel updates addressing this issue.

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