{"api_version":"1","generated_at":"2026-05-13T18:03:34+00:00","cve":"CVE-2026-31738","urls":{"html":"https://cve.report/CVE-2026-31738","api":"https://cve.report/api/cve/CVE-2026-31738.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31738","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31738"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 15:16:36","updated_at":"2026-05-07 18:58:07"},"problem_types":["NVD-CWE-noinfo"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679","name":"https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3","name":"https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500","name":"https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1","name":"https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b","name":"https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7","name":"https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385","name":"https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958","name":"https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31738","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31738","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa 901c1dd3bab2955d7e664f914c374c8c3ac2b958 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa e476745917a1e288eb15e7ff49d286a86a4861d3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa 2029712fb2c87e9a8c75094906f2ee29bf08c500 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa 602596c69a70e50d9ab8c6ae0290a01f88229dd7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa de20d2e3b9179d132f5f5b44e490d7c916c6321b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa eddfce70a6f3107d1679b0c2fcbeb96b593bd679 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa b69c4236255bd8de16cd876e58c6f0867d1d78b1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa afa9a05e6c4971bd5586f1b304e14d61fb3d9385 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d8be18c52dbc94989f6d74637b731af39cd3d902 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3927dace523706cc00f808520eaf2125dd7c07b5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.253 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.168 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.134 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.81 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.22 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.12 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"31738","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31738","cve":"CVE-2026-31738","epss":"0.000240000","percentile":"0.068060000","score_date":"2026-05-05","updated_at":"2026-05-06 00:08:10"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/vxlan/vxlan_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"901c1dd3bab2955d7e664f914c374c8c3ac2b958","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"e476745917a1e288eb15e7ff49d286a86a4861d3","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"2029712fb2c87e9a8c75094906f2ee29bf08c500","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"602596c69a70e50d9ab8c6ae0290a01f88229dd7","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"de20d2e3b9179d132f5f5b44e490d7c916c6321b","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"eddfce70a6f3107d1679b0c2fcbeb96b593bd679","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"b69c4236255bd8de16cd876e58c6f0867d1d78b1","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"afa9a05e6c4971bd5586f1b304e14d61fb3d9385","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"status":"affected","version":"d8be18c52dbc94989f6d74637b731af39cd3d902","versionType":"git"},{"status":"affected","version":"3927dace523706cc00f808520eaf2125dd7c07b5","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/vxlan/vxlan_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.14"},{"lessThan":"3.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.134","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.81","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.22","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.134","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.81","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.22","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.12","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-05-01T14:14:34.900Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"vxlan: validate ND option lengths in vxlan_na_create","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31738","datePublished":"2026-05-01T14:14:34.900Z","dateReserved":"2026-03-09T15:48:24.138Z","dateUpdated":"2026-05-01T14:14:34.900Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-01 15:16:36","lastModifiedDate":"2026-05-07 18:58:07","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12.18","versionEndExcluding":"3.13","matchCriteriaId":"B3AB1AFE-C0A2-4331-AA17-444E45EF7B5A"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13.10","versionEndExcluding":"3.14","matchCriteriaId":"32C97B50-DD9D-4C26-A3B5-3CB771644C8A"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14.1","versionEndExcluding":"5.10.253","matchCriteriaId":"96775134-B6E9-42CE-A367-9B4C33EFBF22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.203","matchCriteriaId":"20DDB3E9-AABF-4107-ADB0-5362AA067045"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.168","matchCriteriaId":"E2DDDCA1-6DAB-4018-B920-8F045DDD8D3B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.134","matchCriteriaId":"F56F925B-BAF8-4F4B-B62F-1496AF19A307"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.81","matchCriteriaId":"6EF80433-B33B-43C5-8E64-0FA7B8DCE1BC"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.22","matchCriteriaId":"C9DF8BCE-36D3-475D-9D21-19E4F02F9029"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"6.19.12","matchCriteriaId":"0A2B9540-02D5-41B4-B16A-82AF66FD4F36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:3.14:-:*:*:*:*:*:*","matchCriteriaId":"851B1505-0318-49F4-8D7C-196BE04FF173"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:3.14:rc8:*:*:*:*:*:*","matchCriteriaId":"055557BE-1FE9-45F5-8A95-F8D3C9B031E4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*","matchCriteriaId":"F253B622-8837-4245-BCE5-A7BF8FC76A16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*","matchCriteriaId":"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*","matchCriteriaId":"F666C8D8-6538-46D4-B318-87610DE64C34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*","matchCriteriaId":"02259FDA-961B-47BC-AE7F-93D7EC6E90C2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*","matchCriteriaId":"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*","matchCriteriaId":"1D2315C0-D46F-4F85-9754-F9E5E11374A6"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31738","Ordinal":"1","Title":"vxlan: validate ND option lengths in vxlan_na_create","CVE":"CVE-2026-31738","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31738","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"vxlan: validate ND option lengths in vxlan_na_create"}]}}}