CVE-2026-46053

Analyzed Analyzed - Analysis Complete

Linux Kernel Memory Leak in RDS Protocol

Publication date: 2026-05-27

Last updated on: 2026-06-16

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: net: rds: fix MR cleanup on copy error __rds_rdma_map() hands sg/pages ownership to the transport after get_mr() succeeds. If copying the generated cookie back to user space fails after that point, the error path must not free those resources again before dropping the MR reference. Remove the duplicate unpin/free from the put_user() failure branch so that MR teardown is handled only through the existing final cleanup path.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-27

Last Modified

2026-06-16

Generated

2026-07-06

AI Q&A

2026-05-27

EPSS Evaluated

2026-07-05

NVD

CVE-2026-46053

EUVD

EUVD-2026-32435

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	5.6
linux	linux_kernel	5.6
linux	linux_kernel	5.6
linux	linux_kernel	5.6
linux	linux_kernel	5.6
linux	linux_kernel	5.6
linux	linux_kernel	From 6.7 (inc) to 6.12.86 (exc)
linux	linux_kernel	From 5.16 (inc) to 6.1.175 (exc)
linux	linux_kernel	From 5.11 (inc) to 5.15.209 (exc)
linux	linux_kernel	From 6.2 (inc) to 6.6.140 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.27 (exc)
linux	linux_kernel	From 6.19 (inc) to 7.0.4 (exc)
linux	linux_kernel	From 5.6.1 (inc) to 5.10.258 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's RDS (Reliable Datagram Sockets) networking code, specifically in the __rds_rdma_map() function. The issue arises when the function successfully obtains a memory region (MR) reference via get_mr() and hands over ownership of scatter-gather (sg) lists or pages to the transport layer. If copying the generated cookie back to user space fails after this point, the error handling path incorrectly frees or unpins these resources again before dropping the MR reference, causing a duplicate free or resource cleanup.

The fix involves removing this duplicate unpin/free operation in the error path after put_user() failure, ensuring that MR teardown is only handled once through the final cleanup path.

Impact Analysis

If exploited or triggered, this vulnerability could lead to improper resource management within the kernel, such as double freeing or unpinning of memory regions. This can cause kernel instability, crashes, or potentially lead to denial of service conditions.

Hi! I’m here to help you understand CVE-2026-46053. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70