{"api_version":"1","generated_at":"2026-10-22T13:15:58+00:00","cve":"CVE-2026-98526","urls":{"html":"https://cve.report/CVE-2026-98526","api":"https://cve.report/api/cve/CVE-2026-98526.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98526","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98526"},"summary":{"title":"llc: reserve device headroom for allocated frames","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nllc: reserve device headroom for allocated frames\n\nllc_alloc_frame() reserves link-layer headroom using the device type.\nThis is insufficient for stacked Ethernet devices such as VLAN devices,\nwhere vlan_dev_hard_header() pushes a VLAN header before the lower\ndevice's Ethernet header. An LLC response on such a device can\ntherefore underflow skb headroom in eth_header().\n\nUse LL_RESERVED_SPACE() to account for the device's actual required\nheadroom while preserving the existing LLC device-type check.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:04","updated_at":"2026-10-18 16:17:04"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1937222c2511ac91377d39f28106c34734f5f8c6","name":"https://git.kernel.org/stable/c/1937222c2511ac91377d39f28106c34734f5f8c6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e06f8b6e27cc616d3c587e9784c4a033eb310a16","name":"https://git.kernel.org/stable/c/e06f8b6e27cc616d3c587e9784c4a033eb310a16","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/16ceac2daa89dd16917bc488ab05b9dd6961a603","name":"https://git.kernel.org/stable/c/16ceac2daa89dd16917bc488ab05b9dd6961a603","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/018020f5a48cc86fdd6dc2d380f6c70443ae7639","name":"https://git.kernel.org/stable/c/018020f5a48cc86fdd6dc2d380f6c70443ae7639","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3361c93e417384ebf28003e0fb6d5304653d3b05","name":"https://git.kernel.org/stable/c/3361c93e417384ebf28003e0fb6d5304653d3b05","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7c38524b2b2456bd33cb360420da6cbf9cad1b33","name":"https://git.kernel.org/stable/c/7c38524b2b2456bd33cb360420da6cbf9cad1b33","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1","name":"https://git.kernel.org/stable/c/3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/72b5b9a28b996e09b8b5b944370c79851bb68f52","name":"https://git.kernel.org/stable/c/72b5b9a28b996e09b8b5b944370c79851bb68f52","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98526","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98526","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 018020f5a48cc86fdd6dc2d380f6c70443ae7639 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 7c38524b2b2456bd33cb360420da6cbf9cad1b33 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bf9ae5386bca8836c16e69ab8fdbe46767d7452a 1937222c2511ac91377d39f28106c34734f5f8c6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.222 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* 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":["net/llc/llc_sap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"018020f5a48cc86fdd6dc2d380f6c70443ae7639","status":"affected","version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","versionType":"git"},{"lessThan":"3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1","status":"affected","version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","versionType":"git"},{"lessThan":"7c38524b2b2456bd33cb360420da6cbf9cad1b33","status":"affected","version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","versionType":"git"},{"lessThan":"1937222c2511ac91377d39f28106c34734f5f8c6","status":"affected","version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","versionType":"git"},{"lessThan":"16ceac2daa89dd16917bc488ab05b9dd6961a603","status":"affected","version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","versionType":"git"},{"lessThan":"e06f8b6e27cc616d3c587e9784c4a033eb310a16","status":"affected","version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","versionType":"git"},{"lessThan":"3361c93e417384ebf28003e0fb6d5304653d3b05","status":"affected","version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","versionType":"git"},{"lessThan":"72b5b9a28b996e09b8b5b944370c79851bb68f52","status":"affected","version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/llc/llc_sap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.34"},{"lessThan":"2.6.34","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.271","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.222","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","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":"5.10.271","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.222","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.55","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.9","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"2.6.34","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nllc: reserve device headroom for allocated frames\n\nllc_alloc_frame() reserves link-layer headroom using the device type.\nThis is insufficient for stacked Ethernet devices such as VLAN devices,\nwhere vlan_dev_hard_header() pushes a VLAN header before the lower\ndevice's Ethernet header. An LLC response on such a device can\ntherefore underflow skb headroom in eth_header().\n\nUse LL_RESERVED_SPACE() to account for the device's actual required\nheadroom while preserving the existing LLC device-type check."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:21:07.983Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/018020f5a48cc86fdd6dc2d380f6c70443ae7639"},{"url":"https://git.kernel.org/stable/c/3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1"},{"url":"https://git.kernel.org/stable/c/7c38524b2b2456bd33cb360420da6cbf9cad1b33"},{"url":"https://git.kernel.org/stable/c/1937222c2511ac91377d39f28106c34734f5f8c6"},{"url":"https://git.kernel.org/stable/c/16ceac2daa89dd16917bc488ab05b9dd6961a603"},{"url":"https://git.kernel.org/stable/c/e06f8b6e27cc616d3c587e9784c4a033eb310a16"},{"url":"https://git.kernel.org/stable/c/3361c93e417384ebf28003e0fb6d5304653d3b05"},{"url":"https://git.kernel.org/stable/c/72b5b9a28b996e09b8b5b944370c79851bb68f52"}],"title":"llc: reserve device headroom for allocated frames","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98526","datePublished":"2026-10-18T15:17:44.018Z","dateReserved":"2026-09-25T10:25:14.355Z","dateUpdated":"2026-10-19T09:21:07.983Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:04","lastModifiedDate":"2026-10-18 16:17:04","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98526","Ordinal":"1","Title":"llc: reserve device headroom for allocated frames","CVE":"CVE-2026-98526","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98526","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nllc: reserve device headroom for allocated frames\n\nllc_alloc_frame() reserves link-layer headroom using the device type.\nThis is insufficient for stacked Ethernet devices such as VLAN devices,\nwhere vlan_dev_hard_header() pushes a VLAN header before the lower\ndevice's Ethernet header. An LLC response on such a device can\ntherefore underflow skb headroom in eth_header().\n\nUse LL_RESERVED_SPACE() to account for the device's actual required\nheadroom while preserving the existing LLC device-type check.","Type":"Description","Title":"llc: reserve device headroom for allocated frames"}]}}}