CVE-2026-31738 Details
Description
In the Linux kernel, the following vulnerability has been resolved: vxlan: validate ND option lengths in vxlan_na_create vxlan_na_create() 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.
A vulnerability exists in the Linux kernel's handling of Neighbor Discovery (ND) options within the Virtual Extensible LAN (VXLAN) module. The issue arises in the function 'vxlan_na_create()', which processes ND options based on the lengths specified by the options themselves. A malformed option can cause the parser to read beyond the intended length or to misinterpret the source Link-Layer Address (LLADDR) option. This vulnerability can be exploited by sending crafted ND options that bypass the current validation, potentially leading to incorrect behavior in network communication.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. The official Linux kernel Git repository includes the patched version.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500 | kernel.org | Patch |
| https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958 | kernel.org | Patch |
| https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1 | kernel.org | Patch |
| https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b | kernel.org | Patch |
| https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 3.12.18, < 3.13 >= 3.13.10, < 3.14 >= 3.14.1, < 5.10.253 >= 5.11, < 5.15.203 >= 5.16, < 6.1.168 >= 6.2, < 6.6.134 >= 6.7, < 6.12.81 >= 6.13, < 6.18.22 >= 6.19, < 6.19.12 3.14 - 3.14 rc8 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 7, 2026 | Initial Analysis | [email protected] |
| May 1, 2026 | New CVE Received | kernel.org |