CVE-2024-36945

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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's 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 > 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/smc_ib.c"], "versions": [{"version": "e5c4744cfb598f98672f8d21d59ef2c1fa9c9b5f", "lessThan": "d5a466ab6e78d6f2e0f64435f1e17246c8e941ff", "status": "affected", "versionType": "git"}, {"version": "e5c4744cfb598f98672f8d21d59ef2c1fa9c9b5f", "lessThan": "5df93c029a907b0ff5a4eeadd77ba06ff0a277d2", "status": "affected", "versionType": "git"}, {"version": "e5c4744cfb598f98672f8d21d59ef2c1fa9c9b5f", "lessThan": "da91e447d06dc649fcf46e59122e7bf8f0b2e0db", "status": "affected", "versionType": "git"}, {"version": "e5c4744cfb598f98672f8d21d59ef2c1fa9c9b5f", "lessThan": "2ddc0dd7fec86ee53b8928a5cca5fbddd4fc7c06", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/smc_ib.c"], "versions": [{"version": "5.16", "status": "affected"}, {"version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.91", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.31", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8.10", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.91"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.6.31"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.8.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.9"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d5a466ab6e78d6f2e0f64435f1e17246c8e941ff"}, {"url": "https://git.kernel.org/stable/c/5df93c029a907b0ff5a4eeadd77ba06ff0a277d2"}, {"url": "https://git.kernel.org/stable/c/da91e447d06dc649fcf46e59122e7bf8f0b2e0db"}, {"url": "https://git.kernel.org/stable/c/2ddc0dd7fec86ee53b8928a5cca5fbddd4fc7c06"}], "title": "net/smc: fix neighbour and rtable leak in smc_ib_find_route()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-04T20:30:31.469457Z", "id": "CVE-2024-36945", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "ADP Container", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T20:30:45.208Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/d5a466ab6e78d6f2e0f64435f1e17246c8e941ff", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/5df93c029a907b0ff5a4eeadd77ba06ff0a277d2", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/da91e447d06dc649fcf46e59122e7bf8f0b2e0db", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/2ddc0dd7fec86ee53b8928a5cca5fbddd4fc7c06", "tags": ["x_transferred"]}, {"url": "https://security.netapp.com/advisory/ntap-20250404-0006/"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-04-04T23:03:03.722Z"}}]}}

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Puede causar la fuga de recuento, as\u00ed que corr\u00edjalo."}], "id": "CVE-2024-36945", "lastModified": "2026-08-04T11:18:33.830", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-36945", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-04T20:30:31.469457Z", "version": "2.0.3"}}]}, "published": "2024-05-30T16:15:17.480", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2ddc0dd7fec86ee53b8928a5cca5fbddd4fc7c06"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5df93c029a907b0ff5a4eeadd77ba06ff0a277d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d5a466ab6e78d6f2e0f64435f1e17246c8e941ff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da91e447d06dc649fcf46e59122e7bf8f0b2e0db"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2ddc0dd7fec86ee53b8928a5cca5fbddd4fc7c06"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5df93c029a907b0ff5a4eeadd77ba06ff0a277d2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d5a466ab6e78d6f2e0f64435f1e17246c8e941ff"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da91e447d06dc649fcf46e59122e7bf8f0b2e0db"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20250404-0006/"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:5101", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.16.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-08-08T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}], "bugzilla": {"description": "kernel: net/smc: fix neighbour and rtable leak in smc_ib_find_route()", "id": "2284465", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2284465"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "verified"}, "cwe": "CWE-401", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/smc: fix neighbour and rtable leak in smc_ib_find_route()\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."], "name": "CVE-2024-36945", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-36945\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-36945\nhttps://lore.kernel.org/linux-cve-announce/2024053039-CVE-2024-36945-18ae@gregkh/T"], "threat_severity": "Low"}

{}