vxlan: validate ND option lengths in vxlan_na_create

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Summary

CVECVE-2026-31738
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:36 UTC
Updated2026-05-07 18:58:07 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa 901c1dd3bab2955d7e664f914c374c8c3ac2b958 git Not specified
CNA Linux Linux affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa e476745917a1e288eb15e7ff49d286a86a4861d3 git Not specified
CNA Linux Linux affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa 2029712fb2c87e9a8c75094906f2ee29bf08c500 git Not specified
CNA Linux Linux affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa 602596c69a70e50d9ab8c6ae0290a01f88229dd7 git Not specified
CNA Linux Linux affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa de20d2e3b9179d132f5f5b44e490d7c916c6321b git Not specified
CNA Linux Linux affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa eddfce70a6f3107d1679b0c2fcbeb96b593bd679 git Not specified
CNA Linux Linux affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa b69c4236255bd8de16cd876e58c6f0867d1d78b1 git Not specified
CNA Linux Linux affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa afa9a05e6c4971bd5586f1b304e14d61fb3d9385 git Not specified
CNA Linux Linux affected d8be18c52dbc94989f6d74637b731af39cd3d902 git Not specified
CNA Linux Linux affected 3927dace523706cc00f808520eaf2125dd7c07b5 git Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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