172 lines
8.6 KiB
JSON
172 lines
8.6 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2023-54085",
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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": "2025-12-24T13:02:52.515Z",
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"datePublished": "2025-12-24T13:06:16.161Z",
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"dateUpdated": "2026-10-15T21:41:39.088Z"
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},
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:17:06.087Z"
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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\nmptcp: fix NULL pointer dereference on fastopen early fallback\n\nIn case of early fallback to TCP, subflow_syn_recv_sock() deletes\nthe subflow context before returning the newly allocated sock to\nthe caller.\n\nThe fastopen path does not cope with the above unconditionally\ndereferencing the subflow context."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - The crash is triggered entirely by a received TCP SYN packet with fastopen data arriving at an MPTCP listening socket, processed in the TCP input path (`tcp_conn_request`). Any routable remote peer can reach it.\nAC:L - The attacker fully controls the trigger — a TFO SYN with data and no MPTCP options deterministically causes `subflow_ulp_clone()` to drop the context and `subflow_prep_synack()` to pass NULL; there is no race, no memory-layout dependency, and the TFO cookie is freely obtainable from a prior normal connection.\nPR:N - No credentials or prior authentication are required; the fault occurs during connection establishment, before any application-level handshake, on a socket that has not yet been accepted.\nUI:N - Exploitation requires only that the attacker send packets to the listening port; no action by any local user or administrator is needed at attack time.\nS:U - The NULL dereference occurs in the kernel's own network stack and affects only the kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The faulting access is a load of `subflow->tcp_sock` at a fixed small offset from NULL, which aborts immediately; no attacker-controlled data is read back or disclosed.\nI:N - Execution aborts on the first NULL load before `subflow->is_mptfo = 1` or any queue manipulation, so no kernel memory is modified and no control-flow primitive is obtained.\nA:H - The dereference at NULL+~208 bytes is always unmapped and occurs in NET_RX softirq context, so `oops_end()` takes the `in_interrupt()` path and issues `panic(\"Fatal exception in interrupt\")` — a guaranteed, remotely repeatable full system crash."
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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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"net/mptcp/fastopen.c"
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],
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"versions": [
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{
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"version": "36b122baf6a8bd46b4a591f12f4ed17b22257408",
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"status": "affected",
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{
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"product": "Linux",
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"defaultStatus": "affected",
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"programFiles": [
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"net/mptcp/fastopen.c"
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],
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"versions": [
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{
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"version": "6.2",
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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": "6.2",
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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": "6.2.12",
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"lessThanOrEqual": "6.2.*",
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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": "6.3",
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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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"cpeMatch": [
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.2.12"
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"vulnerable": true,
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/95135835519b0ab931c39908b2c99e9fb3c9068b"
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},
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{
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"url": "https://git.kernel.org/stable/c/c0ff6f6da66a7791a32c0234388b1bdc00244917"
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}
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],
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"title": "mptcp: fix NULL pointer dereference on fastopen early fallback",
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"x_generator": {
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"engine": "bippy-1.2.0"
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"adp": [
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-54085",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:38:15.912200Z"
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],
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"title": "CISA ADP Vulnrichment",
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