159 lines
8.6 KiB
JSON
159 lines
8.6 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80735",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.789Z",
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"datePublished": "2026-09-03T08:21:51.344Z",
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"dateUpdated": "2026-09-04T04:58:20.684Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-09-04T04:58:20.684Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
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"baseScore": 7.3,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/ovpn/socket.c"
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],
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"versions": [
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{
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"version": "f6226ae7a0cd47aaa9175aca6a1e19600f884cbf",
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"lessThan": "61fb3cca40ff938671474f4a16adb908c19032d7",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f6226ae7a0cd47aaa9175aca6a1e19600f884cbf",
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"lessThan": "43a31142e1d22b3cf5490bd94a94db7196901734",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f6226ae7a0cd47aaa9175aca6a1e19600f884cbf",
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"lessThan": "59aed1eb60d70678a53acccb0cb337a26ce6680e",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/ovpn/socket.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.45",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.9",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.18.45"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.1.9"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/61fb3cca40ff938671474f4a16adb908c19032d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/43a31142e1d22b3cf5490bd94a94db7196901734"
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},
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{
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"url": "https://git.kernel.org/stable/c/59aed1eb60d70678a53acccb0cb337a26ce6680e"
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}
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],
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"title": "ovpn: ensure socket is owned by ovpn before deref sk_user_data",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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} |