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                "timestamp": "2024-06-04T20:30:31.469457Z",
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "versions": [
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              "version": "5.16"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.91",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.31",
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              "status": "unaffected",
              "version": "6.8.10",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.9",
              "versionType": "original_commit_for_fix"
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                  "vulnerable": true
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix neighbour and rtable leak in smc_ib_find_route()\n\nIn smc_ib_find_route(), the neighbour found by neigh_lookup() and rtable\nresolved by ip_route_output_flow() are not released or put before return.\nIt may cause the refcount leak, so fix it."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:N - The leak is triggered while processing SMC CLC handshake messages received over TCP from a remote peer \u2014 the server path takes `daddr` straight from the peer\u0027s CLC Proposal v2 extension GID (`af_smc.c:2323`) and the client path from the peer\u0027s CLC Accept GID (`af_smc.c:1245`). No local access, and no RDMA fabric connectivity to the attacker is needed since the handshake is ordinary TCP.\nAC:L - The missing `neigh_release()`/`ip_rt_put()` is unconditional \u2014 every successful route resolution leaks, with no race to win and no memory-layout dependency, and the attacker fully controls `daddr` via the GID it advertises. In an SMC-Rv2 deployment (the scenario in which this code runs at all) the attacker just opens TCP connections in a loop to accumulate leaked references.\nPR:N - `smc_listen_work()` processes the CLC Proposal immediately after TCP accept, before any credential check exists \u2014 SMC has no authentication, and the UEID compared in `smc_clc_match_eid()` is a cleartext fabric identifier the client itself broadcasts in its proposal, not a secret. The client-side path via `smc_connect_rdma_v2_prepare()` requires no EID from the attacker at all.\nUI:N - The attacker initiates the TCP connection to a victim SMC listener and drives the entire handshake itself; the listen worker runs asynchronously with no action by any local user.\nS:U - The leaked `rtable`, `neighbour` and pinned `net_device` references all remain within the kernel\u0027s own resource domain, and no VM/host, IOMMU, or sandbox boundary is crossed.\nC:N - Only reference counts are leaked \u2014 no freed or out-of-bounds memory is read, and nothing from kernel memory is copied back to the peer or to userspace. `nexthop_mac` is filled from a validly-held neighbour before the leak occurs.\nI:N - The bug is a missing decrement, which is the safe direction \u2014 no object is freed early, so there is no UAF, write primitive, or control-flow impact, and both `rcuref` (dst) and `refcount_t` (neigh) saturate with a warning rather than wrapping to zero.\nA:H - Each leaked `dst` and `neighbour` permanently pins a `net_device` reference (`netdev_hold()` in `dst_init()`/`neigh_alloc()`), so device unregistration and network-namespace teardown hang forever in the `unregister_netdevice: waiting for %s to become free` loop, blocking the global `cleanup_net` worker. Additionally, `neigh_forced_gc()` skips any entry with refcount \u003e 1, so an unauthenticated peer varying its advertised GID mints unreclaimable ARP entries until `gc_thresh3` overflow breaks all neighbour resolution on the host, alongside unbounded kernel memory growth."
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          "url": "https://git.kernel.org/stable/c/2ddc0dd7fec86ee53b8928a5cca5fbddd4fc7c06"
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      "title": "net/smc: fix neighbour and rtable leak in smc_ib_find_route()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-36945",
    "datePublished": "2024-05-30T15:35:43.299Z",
    "dateReserved": "2024-05-30T15:25:07.079Z",
    "dateUpdated": "2026-08-05T11:32:12.557Z",
    "state": "PUBLISHED"
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}