Medium 5.5Published May 1, 2026

CVE-2026-31738vxlan: validate ND option lengths in vxlan_na_create

Updated under an hour ago (Oct 27, 2026, 5:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before 901c1dd3bab2955d7e664f914c374c8c3ac2b958; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before e476745917a1e288eb15e7ff49d286a86a4861d3; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before 2029712fb2c87e9a8c75094906f2ee29bf08c500; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before 602596c69a70e50d9ab8c6ae0290a01f88229dd7; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before de20d2e3b9179d132f5f5b44e490d7c916c6321b; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before eddfce70a6f3107d1679b0c2fcbeb96b593bd679; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before b69c4236255bd8de16cd876e58c6f0867d1d78b1; from 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa before afa9a05e6c4971bd5586f1b304e14d61fb3d9385; and 4 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 3.12.18 before 3.13; from 3.13.10 before 3.14; from 3.14.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; and 9 more ranges	NVD

References

References

https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958	patch
https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3	patch
https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500	patch
https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7	patch
https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b	patch
https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679	patch
https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1	patch
https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.