{"id":"CVE-2026-98526","state":"PUBLISHED","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.","publishedAt":"2026-10-18T15:17:44.018Z","updatedAt":"2026-10-19T09:21:07.983Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"018020f5a48cc86fdd6dc2d380f6c70443ae7639","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"7c38524b2b2456bd33cb360420da6cbf9cad1b33","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"1937222c2511ac91377d39f28106c34734f5f8c6","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"16ceac2daa89dd16917bc488ab05b9dd6961a603","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"e06f8b6e27cc616d3c587e9784c4a033eb310a16","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"3361c93e417384ebf28003e0fb6d5304653d3b05","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"72b5b9a28b996e09b8b5b944370c79851bb68f52","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/llc/llc_sap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.34","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.34","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/llc/llc_sap.c"]}],"references":["https://git.kernel.org/stable/c/018020f5a48cc86fdd6dc2d380f6c70443ae7639","https://git.kernel.org/stable/c/3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1","https://git.kernel.org/stable/c/7c38524b2b2456bd33cb360420da6cbf9cad1b33","https://git.kernel.org/stable/c/1937222c2511ac91377d39f28106c34734f5f8c6","https://git.kernel.org/stable/c/16ceac2daa89dd16917bc488ab05b9dd6961a603","https://git.kernel.org/stable/c/e06f8b6e27cc616d3c587e9784c4a033eb310a16","https://git.kernel.org/stable/c/3361c93e417384ebf28003e0fb6d5304653d3b05","https://git.kernel.org/stable/c/72b5b9a28b996e09b8b5b944370c79851bb68f52"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98526.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98526","state":"PUBLISHED","datePublished":"2026-10-18T15:17:44.018Z","dateUpdated":"2026-10-19T09:21:07.983Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.355Z"},"containers":{"cna":{"title":"llc: reserve device headroom for allocated frames","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"018020f5a48cc86fdd6dc2d380f6c70443ae7639","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"7c38524b2b2456bd33cb360420da6cbf9cad1b33","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"1937222c2511ac91377d39f28106c34734f5f8c6","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"16ceac2daa89dd16917bc488ab05b9dd6961a603","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"e06f8b6e27cc616d3c587e9784c4a033eb310a16","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"3361c93e417384ebf28003e0fb6d5304653d3b05","versionType":"git"},{"version":"bf9ae5386bca8836c16e69ab8fdbe46767d7452a","status":"affected","lessThan":"72b5b9a28b996e09b8b5b944370c79851bb68f52","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/llc/llc_sap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.34","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.34","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/llc/llc_sap.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:21:07.983Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}