CVE-2026-43184

Analyzed Analyzed - Analysis Complete

Zeroed Response Buffer in Linux Kernel rnbd-srv

Publication date: 2026-05-06

Last updated on: 2026-05-11

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: rnbd-srv: Zero the rsp buffer before using it Before using the data buffer to send back the response message, zero it completely. This prevents any stray bytes to be picked up by the client side when there the message is exchanged between different protocol versions.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-06

Last Modified

2026-05-11

Generated

2026-07-06

AI Q&A

2026-05-06

EPSS Evaluated

2026-07-05

NVD

CVE-2026-43184

EUVD

EUVD-2026-27744

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.2 (inc) to 6.6.128 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.75 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.16 (exc)
linux	linux_kernel	From 6.19 (inc) to 6.19.6 (exc)
linux	linux_kernel	From 5.11 (inc) to 5.15.202 (exc)
linux	linux_kernel	From 5.16 (inc) to 6.1.165 (exc)
linux	linux_kernel	From 5.8 (inc) to 5.10.252 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel component called rnbd-srv. It involves the rsp buffer, which is used to send back response messages. Before this fix, the rsp buffer was not completely cleared (zeroed) before use, which could cause leftover data (stray bytes) from previous messages to be included in the response. This could happen especially when messages are exchanged between different protocol versions.

The fix involves zeroing the rsp buffer completely before using it to ensure no unintended data is sent back to the client.

Impact Analysis

If exploited, this vulnerability could cause unintended data from previous communications to be leaked to clients. This could potentially expose sensitive or confidential information that was stored in the buffer from earlier messages.

Such data leakage might lead to privacy concerns or information disclosure, depending on what data is inadvertently sent.

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