{"api_version":"1","generated_at":"2026-10-22T13:15:41+00:00","cve":"CVE-2026-98568","urls":{"html":"https://cve.report/CVE-2026-98568","api":"https://cve.report/api/cve/CVE-2026-98568.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98568","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98568"},"summary":{"title":"vxlan: use one headroom snapshot for neighbour replies","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use one headroom snapshot for neighbour replies\n\nvxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then\nsamples it again to reserve headroom. A concurrent vxlan_changelink() can\nupdate needed_headroom between the two reads, creating a TOCTOU race. The\nsecond value can exceed the allocation and make the Ethernet header write out\nof bounds.\n\nThe race is reproducible on the unpatched kernel. It occurred when\nvxlan_na_create() generated a neighbour reply while vxlan_changelink() changed\nthe link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte\nskbuff_small_head allocation.\n\nSnapshot the headroom once and use that value for both allocation and\nreservation.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:09","updated_at":"2026-10-19 10:19:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7","name":"https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb","name":"https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14","name":"https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc","name":"https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6","name":"https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98568","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98568","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa 45a67662bf8ce3aa5643accf98d328dfbb47eaf6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa 315d42ca39f69846662961c25dcf2bb07c350d14 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa a3c5eb6e382dd426a5e7eb08608897ed57167ff7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa ff022fd9d0f0282c575e11778b96bd1b637503eb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa 481506a756dcd828ef42391cb08f38d8d96d38fc 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 3.12.18 3.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.13.10 3.14 semver","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 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.55 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.9 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"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":"45a67662bf8ce3aa5643accf98d328dfbb47eaf6","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"315d42ca39f69846662961c25dcf2bb07c350d14","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"a3c5eb6e382dd426a5e7eb08608897ed57167ff7","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"ff022fd9d0f0282c575e11778b96bd1b637503eb","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"lessThan":"481506a756dcd828ef42391cb08f38d8d96d38fc","status":"affected","version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","versionType":"git"},{"status":"affected","version":"d8be18c52dbc94989f6d74637b731af39cd3d902","versionType":"git"},{"status":"affected","version":"3927dace523706cc00f808520eaf2125dd7c07b5","versionType":"git"},{"lessThan":"3.13","status":"affected","version":"3.12.18","versionType":"semver"},{"lessThan":"3.14","status":"affected","version":"3.13.10","versionType":"semver"}]},{"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":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.55","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.55","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.9","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","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: use one headroom snapshot for neighbour replies\n\nvxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then\nsamples it again to reserve headroom. A concurrent vxlan_changelink() can\nupdate needed_headroom between the two reads, creating a TOCTOU race. The\nsecond value can exceed the allocation and make the Ethernet header write out\nof bounds.\n\nThe race is reproducible on the unpatched kernel. It occurred when\nvxlan_na_create() generated a neighbour reply while vxlan_changelink() changed\nthe link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte\nskbuff_small_head allocation.\n\nSnapshot the headroom once and use that value for both allocation and\nreservation."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:21:53.865Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6"},{"url":"https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14"},{"url":"https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7"},{"url":"https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb"},{"url":"https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc"}],"title":"vxlan: use one headroom snapshot for neighbour replies","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98568","datePublished":"2026-10-18T15:18:34.562Z","dateReserved":"2026-09-25T10:25:14.357Z","dateUpdated":"2026-10-19T09:21:53.865Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:09","lastModifiedDate":"2026-10-19 10:19:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98568","Ordinal":"1","Title":"vxlan: use one headroom snapshot for neighbour replies","CVE":"CVE-2026-98568","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98568","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use one headroom snapshot for neighbour replies\n\nvxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then\nsamples it again to reserve headroom. A concurrent vxlan_changelink() can\nupdate needed_headroom between the two reads, creating a TOCTOU race. The\nsecond value can exceed the allocation and make the Ethernet header write out\nof bounds.\n\nThe race is reproducible on the unpatched kernel. It occurred when\nvxlan_na_create() generated a neighbour reply while vxlan_changelink() changed\nthe link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte\nskbuff_small_head allocation.\n\nSnapshot the headroom once and use that value for both allocation and\nreservation.","Type":"Description","Title":"vxlan: use one headroom snapshot for neighbour replies"}]}}}