{"api_version":"1","generated_at":"2026-09-13T12:09:49+00:00","cve":"CVE-2026-80735","urls":{"html":"https://cve.report/CVE-2026-80735","api":"https://cve.report/api/cve/CVE-2026-80735.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80735","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80735"},"summary":{"title":"ovpn: ensure socket is owned by ovpn before deref sk_user_data","description":"In the Linux kernel, the following vulnerability has been resolved:\n\novpn: ensure socket is owned by ovpn before deref sk_user_data\n\nSome subsystems, like BPF SOCKMAP, set sk_user_data without\nactually setting the encap_type.\n\nFor this reason, we must make sure that the type is the\none ovpn expects before dereferencing sk_user_data.\n\nFailing to do so may lead to out-of-bounds reads.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-03 13:06:12","updated_at":"2026-09-04 05:17:14"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.3","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","baseScore":7.3,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.3","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","data":{"baseScore":7.3,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/43a31142e1d22b3cf5490bd94a94db7196901734","name":"https://git.kernel.org/stable/c/43a31142e1d22b3cf5490bd94a94db7196901734","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/59aed1eb60d70678a53acccb0cb337a26ce6680e","name":"https://git.kernel.org/stable/c/59aed1eb60d70678a53acccb0cb337a26ce6680e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/61fb3cca40ff938671474f4a16adb908c19032d7","name":"https://git.kernel.org/stable/c/61fb3cca40ff938671474f4a16adb908c19032d7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80735","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80735","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f6226ae7a0cd47aaa9175aca6a1e19600f884cbf 61fb3cca40ff938671474f4a16adb908c19032d7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f6226ae7a0cd47aaa9175aca6a1e19600f884cbf 43a31142e1d22b3cf5490bd94a94db7196901734 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f6226ae7a0cd47aaa9175aca6a1e19600f884cbf 59aed1eb60d70678a53acccb0cb337a26ce6680e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.16","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.16 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the Linux kernel, the following vulnerability has been resolved:\n\novpn: ensure socket is owned by ovpn before deref sk_user_data\n\nSome subsystems, like BPF SOCKMAP, set sk_user_data without\nactually setting the encap_type.\n\nFor this reason, we must make sure that the type is the\none ovpn expects before dereferencing sk_user_data.\n\nFailing to do so may lead to out-of-bounds reads."}],"metrics":[{"cvssV3_1":{"baseScore":7.3,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is reached only via OVPN_CMD_PEER_NEW genetlink (local sendmsg/netlink syscall) that passes a UDP socket fd into ovpn_socket_new(); BPF SOCKMAP enrollment and ovpn setup are local kernel control paths, not remote packet handling.\nAC:L - An attacker who can use OVPN netlink and BPF SOCKMAP fully controls creating a UDP socket, enrolling it in sockmap (sk_user_data set, encap_type left zero), and issuing PEER_NEW, deterministically hitting the bad cast on each attempt.\nPR:L - All OVPN genetlink commands require GENL_ADMIN_PERM (CAP_NET_ADMIN), and BPF SOCKMAP enrollment needs bpf()/map privileges (CAP_BPF, often plus CAP_NET_ADMIN); both are obtainable by unprivileged users inside permitted user/network namespaces per CNA guidance.\nUI:N - No separate victim action is required; the same local actor creates the ovpn interface, enrolls their UDP socket in BPF SOCKMAP, and sends OVPN_CMD_PEER_NEW to trigger ovpn_socket_new() on that fd.\nS:U - Impact is confined to kernel memory misinterpretation within the host kernel security domain on VPN/offload nodes; it does not cross VM, container runtime, or IOMMU boundaries into another security authority.\nC:H - When sk_user_data points to a BPF sk_psock (or similar non-ovpn owner) but encap_type is zero, ovpn_socket_new() casts it to struct ovpn_socket and reads ovpn_sock->ovpn, a type-confused out-of-bounds read of kernel memory per CNA OOB-read guidance.\nI:H - This is type confusion between foreign sk_user_data objects and struct ovpn_socket; CNA guidance rates type confusion High, and a mistaken ovpn_sock->ovpn match could drive ovpn_socket_hold() against the wrong layout, corrupting refcount-adjacent kernel fields.\nA:L - The common path returns -EBUSY after the misread comparison, but the confused read and any mistaken hold can still provoke WARN/KASAN faults or refcount corruption on VPN gateways running ovpn offload with BPF sockmap, giving at least Low availability impact when uncertain."}]}],"providerMetadata":{"dateUpdated":"2026-09-04T04:58:20.684Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/61fb3cca40ff938671474f4a16adb908c19032d7"},{"url":"https://git.kernel.org/stable/c/43a31142e1d22b3cf5490bd94a94db7196901734"},{"url":"https://git.kernel.org/stable/c/59aed1eb60d70678a53acccb0cb337a26ce6680e"}],"title":"ovpn: ensure socket is owned by ovpn before deref sk_user_data","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80735","datePublished":"2026-09-03T08:21:51.344Z","dateReserved":"2026-08-26T14:34:25.789Z","dateUpdated":"2026-09-04T04:58:20.684Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-03 13:06:12","lastModifiedDate":"2026-09-04 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encap_type.\n\nFor this reason, we must make sure that the type is the\none ovpn expects before dereferencing sk_user_data.\n\nFailing to do so may lead to out-of-bounds reads.","Type":"Description","Title":"ovpn: ensure socket is owned by ovpn before deref sk_user_data"}]}}}