{"api_version":"1","generated_at":"2026-08-22T15:54:04+00:00","cve":"CVE-2026-72450","urls":{"html":"https://cve.report/CVE-2026-72450","api":"https://cve.report/api/cve/CVE-2026-72450.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72450","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72450"},"summary":{"title":"xfrm: validate selector family and prefixlen during match","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: validate selector family and prefixlen during match\n\nsyzbot reported a shift-out-of-bounds in xfrm_selector_match()\ndue to AF_UNSPEC selector with large prefixlen (e.g. 128) matched\nagainst IPv4 flow (when XFRM_STATE_AF_UNSPEC is set).\n\nFix this by:\n\n- Rejecting mismatched families in xfrm_selector_match.\n- Returning false in addr4_match if prefixlen > 32.\n- Returning false in addr_match if prefixlen > 128 (prevents overflow).","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:18","updated_at":"2026-08-17 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72450","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8df5cd51fd70c33aa1776e5cbcd82b0a86649d73 87a5bbccc7ff4edb3f42fea387124237d2ba91ee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71 bd7f202cf77556cff59f68dc30e4cdf40cb6e33b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bce1afaa212ec380bf971614f70909a27882b862 a3968ad4195d72c8fddcc6c0ef39da95ac98711a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7d9868180bd1e4cf37e7c5067362658971162366 efa9e3b9f3dea2e1ea4c7edf4edc863faef85986 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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alse,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: validate selector family and prefixlen during match\n\nsyzbot reported a shift-out-of-bounds in xfrm_selector_match()\ndue to AF_UNSPEC selector with large prefixlen (e.g. 128) matched\nagainst IPv4 flow (when XFRM_STATE_AF_UNSPEC is set).\n\nFix this by:\n\n- Rejecting mismatched families in xfrm_selector_match.\n- Returning false in addr4_match if prefixlen > 32.\n- Returning false in addr_match if prefixlen > 128 (prevents overflow)."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The bug is armed via NETLINK_XFRM (XFRM_MSG_NEWSA with XFRM_STATE_AF_UNSPEC) in xfrm_user_rcv_msg(), and per kernel CNA guidance xfrm/netlink configuration is Local even though xfrm_selector_match() is later hit from IPv4/IPv6 packet processing in __xfrm_policy_check() and xfrm_state_look_at().\nAC:L - The attacker fully controls the malformed SA selector (AF_UNSPEC with prefixlen up to 255) and can deterministically trigger matching by sending or receiving IPv4/IPv6 traffic through xfrm; no race, victim state, or memory layout outside attacker control is required.\nPR:L - xfrm_user_rcv_msg() requires netlink_net_capable(CAP_NET_ADMIN), evaluated against the socket net namespace user_ns via ns_capable(); an unprivileged local user obtains CAP_NET_ADMIN with unshare -Urn and can install the poisoned SA and matching policy in that namespace.\nUI:N - The attacker performs the entire sequence—installing the XFRM SA/policy over netlink and generating matching traffic—with no action required from any other user, administrator, or victim.\nS:U - The shift-out-of-bounds and out-of-bounds memcmp reads occur entirely within kernel xfrm selector matching on the same host; no VM escape, IOMMU bypass, or cross-security-authority boundary is crossed.\nC:H - addr4_match() performs an undefined left-shift when prefixlen>32 on IPv4 flows, and addr_match() can memcmp() up to (prefixlen>>5)<<2 bytes past 16-byte selector/flow addresses when prefixlen>128 on IPv6, leaking adjacent kernel memory per CNA OOB-read guidance.\nI:H - C11 undefined-behavior shifts in hot-path packet classification and unchecked prefix comparisons can corrupt mask/offset arithmetic and selector-match control flow, giving attacker-influenced kernel behavior exploitable for integrity compromise per CNA memory-unsafe-operation guidance.\nA:H - syzbot reproduced UBSAN shift-out-of-bounds in xfrm_selector_match(), and undefined shifts plus out-of-bounds reads in the xfrm input/policy-check path can provoke kernel oops/panic (especially with panic_on_warn/KASAN), satisfying CNA guidance that kernel crashes are High availability impact."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:44:19.730Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/87a5bbccc7ff4edb3f42fea387124237d2ba91ee"},{"url":"https://git.kernel.org/stable/c/bd7f202cf77556cff59f68dc30e4cdf40cb6e33b"},{"url":"https://git.kernel.org/stable/c/a3968ad4195d72c8fddcc6c0ef39da95ac98711a"},{"url":"https://git.kernel.org/stable/c/efa9e3b9f3dea2e1ea4c7edf4edc863faef85986"},{"url":"https://git.kernel.org/stable/c/78783fefdc8f36879b1a17efa0d3195ea5f2dc5f"},{"url":"https://git.kernel.org/stable/c/6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe"},{"url":"https://git.kernel.org/stable/c/5a03a2ee17e8259dde631ed84fd8322db06cb2ae"},{"url":"https://git.kernel.org/stable/c/40f0b1047918539f0b0f795ac65e35336b4c2c78"}],"title":"xfrm: validate selector family and prefixlen during match","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72450","datePublished":"2026-08-15T05:56:58.939Z","dateReserved":"2026-08-09T03:40:39.931Z","dateUpdated":"2026-08-17T05:44:19.730Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:18","lastModifiedDate":"2026-08-17 06:19:12","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72450","Ordinal":"1","Title":"xfrm: validate selector family and prefixlen during match","CVE":"CVE-2026-72450","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72450","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: validate selector family and prefixlen during match\n\nsyzbot reported a shift-out-of-bounds in xfrm_selector_match()\ndue to AF_UNSPEC selector with large prefixlen (e.g. 128) matched\nagainst IPv4 flow (when XFRM_STATE_AF_UNSPEC is set).\n\nFix this by:\n\n- Rejecting mismatched families in xfrm_selector_match.\n- Returning false in addr4_match if prefixlen > 32.\n- Returning false in addr_match if prefixlen > 128 (prevents overflow).","Type":"Description","Title":"xfrm: validate selector family and prefixlen during match"}]}}}