CVE-2026-43435

Undergoing Analysis Undergoing Analysis - In Progress

Linux Kernel Oneway Spam Detection Bypass

Publication date: 2026-05-08

Last updated on: 2026-05-22

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: rust_binder: fix oneway spam detection The spam detection logic in TreeRange was executed before the current request was inserted into the tree. So the new request was not being factored in the spam calculation. Fix this by moving the logic after the new range has been inserted. Also, the detection logic for ArrayRange was missing altogether which meant large spamming transactions could get away without being detected. Fix this by implementing an equivalent low_oneway_space() in ArrayRange. Note that I looked into centralizing this logic in RangeAllocator but iterating through 'state' and 'size' got a bit too complicated (for me) and I abandoned this effort.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-08

Last Modified

2026-05-22

Generated

2026-07-09

AI Q&A

2026-05-08

EPSS Evaluated

2026-07-08

NVD

CVE-2026-43435

EUVD

EUVD-2026-28741

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	From 6.19 (inc) to 6.19.9 (exc)
linux	linux_kernel	From 6.18 (inc) to 6.18.19 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability relates to the Linux kernel's rust_binder component, specifically its spam detection logic for oneway transactions.

The issue was that the spam detection in TreeRange was performed before the new request was added to the tracking tree, so the new request was not considered in the spam calculation.

Additionally, the ArrayRange detection logic was missing entirely, allowing large spamming transactions to go undetected.

The fix involved moving the spam detection logic to after the new request insertion in TreeRange and implementing a similar detection mechanism for ArrayRange.

Impact Analysis

This vulnerability could allow large spamming transactions to bypass detection in the rust_binder component of the Linux kernel.

Such undetected spamming could lead to resource exhaustion or degraded system performance due to excessive oneway requests.

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