{"api_version":"1","generated_at":"2026-07-22T08:02:23+00:00","cve":"CVE-2026-63922","urls":{"html":"https://cve.report/CVE-2026-63922","api":"https://cve.report/api/cve/CVE-2026-63922.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63922","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63922"},"summary":{"title":"ipv6: exthdrs: refresh nh after handling HAO option","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: exthdrs: refresh nh after handling HAO option\n\nip6_parse_tlv() caches skb_network_header(skb) in nh while walking\nIPv6 TLVs.\n\nipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can\nmove the skb head and invalidate the cached network header pointer.\nRefresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs\nare parsed from the current skb head.\n\nThis matches the existing pattern used in ip6_parse_tlv() after helpers\nthat can modify skb header storage.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:10","updated_at":"2026-07-20 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the Linux kernel, the following vulnerability has been resolved:\n\nipv6: exthdrs: refresh nh after handling HAO option\n\nip6_parse_tlv() caches skb_network_header(skb) in nh while walking\nIPv6 TLVs.\n\nipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can\nmove the skb head and invalidate the cached network header pointer.\nRefresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs\nare parsed from the current skb head.\n\nThis matches the existing pattern used in ip6_parse_tlv() after helpers\nthat can modify skb header storage."}],"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":"2026-07-20T13:41:32.124Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f8aabed3ff3e986920cf02a2a2785e08e586b234"},{"url":"https://git.kernel.org/stable/c/1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1"},{"url":"https://git.kernel.org/stable/c/12d957979e4a800167842f1b42be6a606d227ebe"},{"url":"https://git.kernel.org/stable/c/ff375ed1cba81392346c5bfbf0bb7a13b2946f99"},{"url":"https://git.kernel.org/stable/c/751db1b802a067b7fff25880f4e9f9152a171538"},{"url":"https://git.kernel.org/stable/c/9b6dcc0a39fd71752937f0b6b3973e1416085dcf"},{"url":"https://git.kernel.org/stable/c/f7b52afe3592eae66e160586b45a3f2242972c63"}],"title":"ipv6: exthdrs: refresh nh after handling HAO option","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63922","datePublished":"2026-07-19T14:55:24.268Z","dateReserved":"2026-07-19T07:54:57.021Z","dateUpdated":"2026-07-20T13:41:32.124Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:10","lastModifiedDate":"2026-07-20 15:16:56","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":"63922","Ordinal":"1","Title":"ipv6: exthdrs: refresh nh after handling HAO option","CVE":"CVE-2026-63922","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63922","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: exthdrs: refresh nh after handling HAO option\n\nip6_parse_tlv() caches skb_network_header(skb) in nh while walking\nIPv6 TLVs.\n\nipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can\nmove the skb head and invalidate the cached network header pointer.\nRefresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs\nare parsed from the current skb head.\n\nThis matches the existing pattern used in ip6_parse_tlv() after helpers\nthat can modify skb header storage.","Type":"Description","Title":"ipv6: exthdrs: refresh nh after handling HAO option"}]}}}