{"api_version":"1","generated_at":"2026-07-22T17:07:02+00:00","cve":"CVE-2026-63912","urls":{"html":"https://cve.report/CVE-2026-63912","api":"https://cve.report/api/cve/CVE-2026-63912.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63912","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63912"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:09","updated_at":"2026-07-20 15:16:55"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708","name":"https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59","name":"https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c","name":"https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40","name":"https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095","name":"https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec","name":"https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e","name":"https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba","name":"https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63912","name":"CVE 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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."}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:41:22.064Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e"},{"url":"https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c"},{"url":"https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708"},{"url":"https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec"},{"url":"https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba"},{"url":"https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59"},{"url":"https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095"},{"url":"https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40"}],"title":"xfrm: esp: restore combined single-frag length gate","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63912","datePublished":"2026-07-19T14:55:17.188Z","dateReserved":"2026-07-19T07:54:57.020Z","dateUpdated":"2026-07-20T13:41:22.064Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:09","lastModifiedDate":"2026-07-20 15:16:55","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63912","Ordinal":"1","Title":"xfrm: esp: restore combined single-frag length gate","CVE":"CVE-2026-63912","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63912","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"xfrm: esp: restore combined single-frag length gate"}]}}}