{"id":"CVE-2026-31738","state":"PUBLISHED","title":"vxlan: validate ND option lengths in vxlan_na_create","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: validate ND option lengths in vxlan_na_create\n\nvxlan_na_create() walks ND options according to option-provided\nlengths. A malformed option can make the parser advance beyond the\ncomputed option span or use a too-short source LLADDR option payload.\n\nValidate option lengths against the remaining NS option area before\nadvancing, and only read source LLADDR when the option is large enough\nfor an Ethernet address.","publishedAt":"2026-05-01T14:14:34.900Z","updatedAt":"2026-05-23T16:05:52.050Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"901c1dd3bab2955d7e664f914c374c8c3ac2b958","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"e476745917a1e288eb15e7ff49d286a86a4861d3","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"2029712fb2c87e9a8c75094906f2ee29bf08c500","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"602596c69a70e50d9ab8c6ae0290a01f88229dd7","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"de20d2e3b9179d132f5f5b44e490d7c916c6321b","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"eddfce70a6f3107d1679b0c2fcbeb96b593bd679","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"b69c4236255bd8de16cd876e58c6f0867d1d78b1","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"afa9a05e6c4971bd5586f1b304e14d61fb3d9385","versionType":"git"},{"version":"d8be18c52dbc94989f6d74637b731af39cd3d902","status":"affected","versionType":"git"},{"version":"3927dace523706cc00f808520eaf2125dd7c07b5","status":"affected","versionType":"git"},{"version":"3.12.18","status":"affected","lessThan":"3.13","versionType":"semver"},{"version":"3.13.10","status":"affected","lessThan":"3.14","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_core.c"]}],"references":["https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958","https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3","https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500","https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7","https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b","https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679","https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1","https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31738.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31738","state":"PUBLISHED","datePublished":"2026-05-01T14:14:34.900Z","dateUpdated":"2026-05-23T16:05:52.050Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.138Z"},"containers":{"cna":{"title":"vxlan: validate ND option lengths in vxlan_na_create","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: validate ND option lengths in vxlan_na_create\n\nvxlan_na_create() walks ND options according to option-provided\nlengths. A malformed option can make the parser advance beyond the\ncomputed option span or use a too-short source LLADDR option payload.\n\nValidate option lengths against the remaining NS option area before\nadvancing, and only read source LLADDR when the option is large enough\nfor an Ethernet address."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"901c1dd3bab2955d7e664f914c374c8c3ac2b958","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"e476745917a1e288eb15e7ff49d286a86a4861d3","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"2029712fb2c87e9a8c75094906f2ee29bf08c500","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"602596c69a70e50d9ab8c6ae0290a01f88229dd7","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"de20d2e3b9179d132f5f5b44e490d7c916c6321b","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"eddfce70a6f3107d1679b0c2fcbeb96b593bd679","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"b69c4236255bd8de16cd876e58c6f0867d1d78b1","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","status":"affected","lessThan":"afa9a05e6c4971bd5586f1b304e14d61fb3d9385","versionType":"git"},{"version":"d8be18c52dbc94989f6d74637b731af39cd3d902","status":"affected","versionType":"git"},{"version":"3927dace523706cc00f808520eaf2125dd7c07b5","status":"affected","versionType":"git"},{"version":"3.12.18","status":"affected","lessThan":"3.13","versionType":"semver"},{"version":"3.13.10","status":"affected","lessThan":"3.14","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958"},{"url":"https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3"},{"url":"https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500"},{"url":"https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7"},{"url":"https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b"},{"url":"https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679"},{"url":"https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1"},{"url":"https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T16:05:52.050Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"7.0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12.18"},{"vulnerable":true,"crite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