CVE-2026-31752
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Linux Kernel ND Option Length Validation Flaw

Publication date: 2026-05-01

Last updated on: 2026-05-07

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: validate ND option lengths br_nd_send() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.
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Meta Information
Published
2026-05-01
Last Modified
2026-05-07
Generated
2026-06-16
AI Q&A
2026-05-01
EPSS Evaluated
2026-06-15
NVD
CVE-2026-31752
EUVD
EUVD-2026-26565
Affected Vendors & Products
Showing 13 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 5.11 (inc) to 5.15.203 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.22 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.168 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.12 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.81 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.134 (exc)
linux linux_kernel From 4.15 (inc) to 5.10.253 (exc)
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Exploitability
CWE
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's bridge component, specifically in the br_nd_send() function which processes Neighbor Discovery (ND) options.

The function walks through ND options based on lengths provided by the options themselves. However, if an option is malformed, it can cause the parser to read beyond the intended option boundary or incorrectly handle a source Link-Layer Address (LLADDR) option that is too short.

The fix involves validating the lengths of options against the remaining Neighbor Solicitation (NS) option area before advancing the parser, and only reading the source LLADDR when the option is large enough to contain a full Ethernet address.

Impact Analysis

This vulnerability in the Linux kernel's bridge component involves improper validation of Neighbor Discovery (ND) option lengths. A malformed ND option can cause the parser to read beyond the intended option boundaries or process an incorrectly sized source link-layer address. This could potentially lead to unexpected behavior in network packet processing, which might be exploited to cause denial of service or other network-related issues.

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