251 lines
13 KiB
JSON
251 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-36945",
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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": "2024-05-30T15:25:07.079Z",
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"datePublished": "2024-05-30T15:35:43.299Z",
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"dateUpdated": "2026-08-05T11:32:12.557Z"
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},
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:32:12.557Z"
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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\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."
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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 leak is triggered while processing SMC CLC handshake messages received over TCP from a remote peer — the server path takes `daddr` straight from the peer's CLC Proposal v2 extension GID (`af_smc.c:2323`) and the client path from the peer's 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 — 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 — 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's own resource domain, and no VM/host, IOMMU, or sandbox boundary is crossed.\nC:N - Only reference counts are leaked — 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 — 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 > 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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}
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]
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}
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],
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"affected": [
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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/smc/smc_ib.c"
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"version": "0",
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"status": "unaffected",
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"version": "6.1.91",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"version": "6.6.31",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.8.10",
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"lessThanOrEqual": "6.8.*",
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"status": "unaffected",
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"versionType": "semver"
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{
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"version": "6.9",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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