CVE-2026-74299

Received Received - Intake

Memory Leak in Linux Kernel RDMA Core

Publication date: 2026-08-15

Last updated on: 2026-08-17

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix FRMR aging push to queue error flow Aging pools with pinned handles requires moving handles from the active queue to a non-empty inactive queue that might fail on new page allocation, we are currently not handling the fault and leaking any mkey that fails the push. Fix by Introducing push_queue_to_queue_locked() that fills the destination's partial tail page from the source and then splices the remaining source pages onto the destination, performing no allocation. Replace the per-handle move loop in age_pinned_pool() and the open-coded splice in pool_aging_work() with calls to the helper. As the helper cannot fail under memory pressure, removing a class of GFP_ATOMIC allocations under the pool lock and simplifying the error flow.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-15

Last Modified

2026-08-17

Generated

2026-09-04

AI Q&A

2026-08-15

EPSS Evaluated

2026-09-03

NVD

CVE-2026-74299

EUVD

EUVD-2026-59446

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves a memory management issue in the RDMA (Remote Direct Memory Access) core. When aging pools with pinned handles, the system attempts to move handles from an active queue to an inactive queue. If this move fails due to a new page allocation error, the system does not handle the fault properly, leading to a memory leak of mkey (memory key) resources.

Detection Guidance

This vulnerability is specific to the Linux kernel's RDMA subsystem and does not have publicly available detection commands. It requires kernel-level inspection for FRMR aging issues in RDMA pools. Check kernel logs for RDMA-related errors or warnings.

Impact Analysis

This vulnerability could lead to resource exhaustion in systems using RDMA, potentially causing performance degradation or system crashes. It may also result in memory leaks, where memory is not properly released, affecting overall system stability.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it pertains to a memory management issue in the Linux kernel's RDMA subsystem. Compliance risks would only arise if exploitation led to unauthorized data access or system instability, which is not indicated in the provided context.

Mitigation Strategies

Update your Linux kernel to the patched version that includes the fix for this RDMA FRMR aging issue. Monitor RDMA subsystem performance and logs for mkey leaks or aging errors after applying the update.

Hi! I’m here to help you understand CVE-2026-74299. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70