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.
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Meta Information
Published
2026-05-27
Last Modified
2026-06-16
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-46053
EUVD
EUVD-2026-32435
Affected Vendors & Products
Showing 13 associated CPEs
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)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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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.

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