{"id":"CVE-2026-63912","revision":null,"records":[{"revision":"949783aad8f04f82bf75654995452691","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63912","aliases":[],"title":"xfrm: esp: restore combined single-frag length gate","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: esp: restore combined single-frag length gate\n\nThe ESP out-of-place fast path appends the trailer in esp_output_head()\nbefore esp_output_tail() allocates the destination page frag. The\nhead-side gate currently checks skb->data_len and tailen separately, but\nthe tail code allocates a single destination frag from the combined\npost-trailer skb->data_len.\n\nReject the page-frag fast path when the combined aligned length exceeds a\npage. Otherwise skb_page_frag_refill() may fall back to a single page while\nthe destination sg still spans the combined skb->data_len.\n\nRestore this combined-length page gate for both IPv4 and IPv6.","state":0,"publishedAt":"2026-07-19T14:55:17.188+00:00","modifiedAt":"2026-10-19T20:17:55.311+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv4/esp4.c\",\n \"net/ipv6/esp6.c\"\n ],\n \"versions\": [\n {\n \"version\": \"c075c3ea031757f8ea2d34567565b61a868c08d5\",\n \"lessThan\": \"566295735530ee513326049b0540f32ec050bf2e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea\",\n \"lessThan\": \"5d7ab86e2b6bc23054616bf6ac562013bf60af8c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5bd8baab087dff657e05387aee802e70304cc813\",\n \"lessThan\": \"36519e3d941fc99d3b52c134dbaf311f987a4708\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5bd8baab087dff657e05387aee802e70304cc813\",\n \"lessThan\": \"322e48187e0245ab2fff6fec2220b0cae677dbec\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5bd8baab087dff657e05387aee802e70304cc813\",\n \"lessThan\": \"b84091ceddc9f133229dceab3ccc930bf27f9cba\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5bd8baab087dff657e05387aee802e70304cc813\",\n \"lessThan\": \"c093468aea8277f77272a4f199b2e15e19cabb59\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5bd8baab087dff657e05387aee802e70304cc813\",\n \"lessThan\": \"65f3b3fc2347b89fe21db1e92c7681368415f095\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5bd8baab087dff657e05387aee802e70304cc813\",\n \"lessThan\": \"dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2c66b0c95bb0aa7652ba1eba293d0d5993b35a38\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef6f83df1209a7d9bd1c605a62457d4c00f9179e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3defefd22ad5fbbe639b6157fb7e6311b2bf333d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b657030870bb5351c5b1e84d4e9f186da6ca0496\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.113\",\n \"lessThan\": \"5.10.259\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.36\",\n \"lessThan\": \"5.15.210\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.14.288\",\n \"lessThan\": \"4.15\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.252\",\n \"lessThan\": \"4.20\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.205\",\n \"lessThan\": \"5.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.17.5\",\n \"lessThan\": \"5.18\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv4/esp4.c\",\n \"net/ipv6/esp6.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.18\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.18\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.259\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.143\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.93\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.35\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.12\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e","https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c","https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708","https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec","https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba","https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59","https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095","https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63912","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63912","identifiers":["CVE-2026-63912"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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