CVE-2026-31738

vxlan: validate ND option lengths in vxlan_na_create

State: Published
Severity: Not scored
Published: May 1, 2026
Updated: May 23, 2026
Reserved: Mar 9, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before 901c1dd3bab2955d7e664f914c374c8c3ac2b958Affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before e476745917a1e288eb15e7ff49d286a86a4861d3Affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before 2029712fb2c87e9a8c75094906f2ee29bf08c500Affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before 602596c69a70e50d9ab8c6ae0290a01f88229dd7Affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before de20d2e3b9179d132f5f5b44e490d7c916c6321bAffected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before eddfce70a6f3107d1679b0c2fcbeb96b593bd679Affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before b69c4236255bd8de16cd876e58c6f0867d1d78b1Affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before afa9a05e6c4971bd5586f1b304e14d61fb3d9385Affected d8be18c52dbc94989f6d74637b731af39cd3d902Affected 3927dace523706cc00f808520eaf2125dd7c07b5Affected 3.12.18 to before 3.13Affected 3.13.10 to before 3.14Affected
LinuxLinux	3.14Affected before 3.14Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.168 through 6.1.Not affected 6.6.134 through 6.6.Not affected 6.12.81 through 6.12.Not affected 6.18.22 through 6.18.Not affected 6.19.12 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before 901c1dd3bab2955d7e664f914c374c8c3ac2b958Affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before e476745917a1e288eb15e7ff49d286a86a4861d3Affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before 2029712fb2c87e9a8c75094906f2ee29bf08c500Affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before 602596c69a70e50d9ab8c6ae0290a01f88229dd7Affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before de20d2e3b9179d132f5f5b44e490d7c916c6321bAffected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before eddfce70a6f3107d1679b0c2fcbeb96b593bd679Affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before b69c4236255bd8de16cd876e58c6f0867d1d78b1Affected
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa to before afa9a05e6c4971bd5586f1b304e14d61fb3d9385Affected
d8be18c52dbc94989f6d74637b731af39cd3d902Affected
3927dace523706cc00f808520eaf2125dd7c07b5Affected
3.12.18 to before 3.13Affected
3.13.10 to before 3.14Affected

LinuxLinux

3.14Affected
before 3.14Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.168 through 6.1.*Not affected
6.6.134 through 6.6.*Not affected
6.12.81 through 6.12.*Not affected
6.18.22 through 6.18.*Not affected
6.19.12 through 6.19.*Not affected
7.0 and laterNot affected

References

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