Vulnerability Report

CVE-2026-43502

Title: Linux Kernel rds Zerocopy Send Cleanup Vulnerability

Other

Proof Of Concept

PoC Available for CVE-2026-43502

CWE Category NVD-CWE-noinfo

Published Date May 21, 2026

Modified Date Jul 23, 2026

Exploit Status Available

Score 7.8 CVSS v

Exploit Probability (EPSS)

0.12%

Vulnerability Summary

CVE-2026-43502: In the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket. The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned normal payload pages. However, zerocopy ownership is really determined by the presence of op_mmp_znotifier, regardless of whether the message has reached the socket queue. Capture op_mmp_znotifier up front in rds_message_purge() and use it as the cleanup discriminator. If the message is already associated with a socket, keep the existing completion path. Otherwise, drop the pinned page accounting directly and release the notifier before putting the payload pages. This keeps early send failure cleanup consistent with the zerocopy lifetime rules without changing the normal queued completion path.

Impacted Vendors

Reference Links

https://git.kernel.org/stable/c/0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b https://git.kernel.org/stable/c/14ef6fd18db2494098b21e0471bf27a1d8e9993e https://git.kernel.org/stable/c/21d70744e6d3bbf9293aa1ee6fba7c53ad75275e https://git.kernel.org/stable/c/3abc8983b2bae3f487f77d9da5527d7d6b210d46 https://git.kernel.org/stable/c/44b550d88b267320459d518c0743a241ab2108fa

CVSS v3.1

Source Entity 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Severity HIGH

7.8

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-43502 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/suominen/pintheft

View Code

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Attack Vector Matrix

Access Vector LOCAL

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.