CVE-2026-31738

vxlan: validate ND option lengths in vxlan_na_create

MEDIUM

5.5

CVSS Score

Published: May 1, 2026 at 02:14 PM UTC

Updated: June 17, 2026 at 10:34 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v ≥ 3.12.18v ≥ 3.13.103.12.18 ≤ v < 3.133.13.10 ≤ v < 3.143.14 ≤ v < 5.10.2533.14 ≤ v < 5.15.2033.14 ≤ v < 6.1.1683.14 ≤ v < 6.12.813.14 ≤ v < 6.18.223.14 ≤ v < 6.19.123.14 ≤ v < 6.6.1343.14 ≤ v < 7.03.14.1 ≤ v < 5.10.2535.11 ≤ v < 5.15.2035.16 ≤ v < 6.1.1686.13 ≤ v < 6.18.226.19 ≤ v < 6.19.126.2 ≤ v < 6.6.1346.7 ≤ v < 6.12.813.12.18 3.13.10 3.14 3.14 rc83927dace523706cc00f808520eaf2125dd7c07b54b29dba9c085a4fb79058fb1c45a2f6257ca3dfa7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6d8be18c52dbc94989f6d74637b731af39cd3d902

Vendor states this is fixed in 2029712fb2c87e9a8c75094906f2ee29bf08c500 (fixed)

Vendor states this is fixed in 602596c69a70e50d9ab8c6ae0290a01f88229dd7 (fixed)

Vendor states this is fixed in 901c1dd3bab2955d7e664f914c374c8c3ac2b958 (fixed)

Vendor states this is fixed in afa9a05e6c4971bd5586f1b304e14d61fb3d9385 (fixed)

Vendor states this is fixed in b69c4236255bd8de16cd876e58c6f0867d1d78b1 (fixed)

Vendor states this is fixed in de20d2e3b9179d132f5f5b44e490d7c916c6321b (fixed)

Vendor states this is fixed in e476745917a1e288eb15e7ff49d286a86a4861d3 (fixed)

Vendor states this is fixed in eddfce70a6f3107d1679b0c2fcbeb96b593bd679 (fixed)

Affected range stops below 3.13, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 3.14 (unaffected)

Vendor states this is fixed in 5.10.253 (unaffected)

Vendor states this is fixed in 5.15.203 (unaffected)