CVE-2026-74692 (GCVE-0-2026-74692)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41
VLAI
Title
net/smc: fix TOCTOU race between smc_listen_out() and listener close
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: fix TOCTOU race between smc_listen_out() and listener close smc_listen_out() reads lsmc->sk.sk_state without the listener lock, then acquires lock_sock_nested() only after the check passes. This opens a window where smc_close_active() can transition the listener to SMC_CLOSED, call smc_close_cleanup_listen() to drain the accept queue, and release the lock, all between the lockless read and the delayed lock acquisition: smc_listen_work (smc_hs_wq) smc_close_active() ------------------------------- ------------------------- release_sock(child) if (sk_state == SMC_LISTEN) TRUE lock_sock(listener) sk_state = SMC_CLOSED smc_close_cleanup_listen() release_sock(listener) flush_work(tcp_listen_work) lock_sock_nested(listener) smc_accept_enqueue(listener, child) /* child enqueued on dead listener */ smc_close_active() flushes only tcp_listen_work. Work items already dispatched onto smc_hs_wq for the CLC handshake continue running unguarded. smc_accept_enqueue() takes a sock_hold() on the child that is never released, so the child smc_sock, its clcsock, and the reference all leak. A remote peer that opens TCP connections while the server calls close() can exhaust kernel memory. Move lock_sock_nested() to before the sk_state check so that the test and the enqueue are atomic under the listener lock.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < 53c7938d8bcfde3296ec1a347ba2a9393c1fdcfa (git)
Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < feb71634bb1abab3e8fb5cde874b27001cc1282e (git)
Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < 01865e1ddb126b25ac9eba5cdd7ec49e11183a64 (git)
Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < 00f89433777236ced4771211047fb5d4cd581cea (git)
Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < 78e5ebcd1c10ed7c8bda0a99e0abd5b62da86d67 (git)
Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < ff5bcd804b5bc5c64736b7d318c20e12ea9506b8 (git)
Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < 185a4caeecabc150106deda1da170b09f2ad803f (git)
Affected: d1d004585b40c212b338fc8a40cbaaf230ea4703 (git)
Affected: 4.19.299 , < 4.20 (semver)
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Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix TOCTOU race between smc_listen_out() and listener close\n\nsmc_listen_out() reads lsmc-\u003esk.sk_state without the listener lock,\nthen acquires lock_sock_nested() only after the check passes. This\nopens a window where smc_close_active() can transition the listener\nto SMC_CLOSED, call smc_close_cleanup_listen() to drain the accept\nqueue, and release the lock, all between the lockless read and the\ndelayed lock acquisition:\n\n  smc_listen_work (smc_hs_wq)          smc_close_active()\n  -------------------------------      -------------------------\n  release_sock(child)\n  if (sk_state == SMC_LISTEN) TRUE\n                                        lock_sock(listener)\n                                        sk_state = SMC_CLOSED\n                                        smc_close_cleanup_listen()\n                                        release_sock(listener)\n                                        flush_work(tcp_listen_work)\n  lock_sock_nested(listener)\n  smc_accept_enqueue(listener, child) /* child enqueued on dead listener */\n\nsmc_close_active() flushes only tcp_listen_work. Work items already\ndispatched onto smc_hs_wq for the CLC handshake continue running\nunguarded. smc_accept_enqueue() takes a sock_hold() on the child that\nis never released, so the child smc_sock, its clcsock, and the\nreference all leak. A remote peer that opens TCP connections while the\nserver calls close() can exhaust kernel memory.\n\nMove lock_sock_nested() to before the sk_state check so that the test\nand the enqueue are atomic under the listener lock."
        }
      ],
      "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": [
            {
              "lang": "en",
              "value": "AV:N - The bug fires when smc_listen_work() on smc_hs_wq finishes an inbound SMC/TCP handshake queued by smc_tcp_listen_work() for each remote connection to an AF_SMC listener, so any network peer that reaches the listener port drives the full path via SYN and CLC messages.\nAC:L - The attacker controls handshake completions by flooding SMC-capable TCP connections and overlapping them with listener close(), either by timing floods against restarts or locally by running server and client together; smc_close_active() only flushes tcp_listen_work, leaving smc_hs_wq workers racing through the unlocked sk_state check.\nPR:N - SMC performs no authentication; smc_create() and smc_listen() enforce no capabilities, and smc_listen_work() processes the CLC handshake immediately after TCP accept before any credential verification, so an unauthenticated remote peer need only reach the listener port.\nUI:N - Exploitation requires only inbound network connections and kernel handshake/close processing; no end-user action such as opening a file or mounting a filesystem is needed, and listener shutdown during deployments or restarts is routine automated server behavior.\nS:U - The leak accumulates orphaned smc_sock structures and clcsock references within the kernel networking subsystem on the targeted host; it does not cross VM, container, IOMMU, or other security boundaries.\nC:N - The bug is an unreleased sock_hold() leaving child sockets on a closed listener accept queue; objects are never freed prematurely, so there is no out-of-bounds read, use-after-free dereference, or kernel data disclosure to the attacker.\nI:N - Only reference counts are incremented without matching decrements; no memory is written out of bounds, no freed object is reused, and no control-flow or integrity primitive is obtained\u2014only unreclaimable kernel allocations accumulate.\nA:H - Each successful race permanently leaks a child smc_sock, its clcsock, and sock references that smc_close_cleanup_listen() can never drain; a remote peer repeating handshakes during listener close can exhaust kernel memory and cause system-wide denial of service."
            }
          ]
        }
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        "dateUpdated": "2026-08-25T05:41:37.608Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/53c7938d8bcfde3296ec1a347ba2a9393c1fdcfa"
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          "url": "https://git.kernel.org/stable/c/feb71634bb1abab3e8fb5cde874b27001cc1282e"
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        },
        {
          "url": "https://git.kernel.org/stable/c/185a4caeecabc150106deda1da170b09f2ad803f"
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      ],
      "title": "net/smc: fix TOCTOU race between smc_listen_out() and listener close",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74692",
    "datePublished": "2026-08-22T15:32:55.873Z",
    "dateReserved": "2026-08-15T05:44:03.926Z",
    "dateUpdated": "2026-08-25T05:41:37.608Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74692",
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      "initial_release_date": "2026-08-24T01:02:51.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/smc: fix TOCTOU race between smc_listen_out() and listener close",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74692.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74692\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:43.667\",\"lastModified\":\"2026-08-25T06:18:52.767\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/smc: fix TOCTOU race between smc_listen_out() and listener close\\n\\nsmc_listen_out() reads lsmc-\u003esk.sk_state without the listener lock,\\nthen acquires lock_sock_nested() only after the check passes. This\\nopens a window where smc_close_active() can transition the listener\\nto SMC_CLOSED, call smc_close_cleanup_listen() to drain the accept\\nqueue, and release the lock, all between the lockless read and the\\ndelayed lock acquisition:\\n\\n  smc_listen_work (smc_hs_wq)          smc_close_active()\\n  -------------------------------      -------------------------\\n  release_sock(child)\\n  if (sk_state == SMC_LISTEN) TRUE\\n                                        lock_sock(listener)\\n                                        sk_state = SMC_CLOSED\\n                                        smc_close_cleanup_listen()\\n                                        release_sock(listener)\\n                                        flush_work(tcp_listen_work)\\n  lock_sock_nested(listener)\\n  smc_accept_enqueue(listener, child) /* child enqueued on dead listener */\\n\\nsmc_close_active() flushes only tcp_listen_work. Work items already\\ndispatched onto smc_hs_wq for the CLC handshake continue running\\nunguarded. smc_accept_enqueue() takes a sock_hold() on the child that\\nis never released, so the child smc_sock, its clcsock, and the\\nreference all leak. A remote peer that opens TCP connections while the\\nserver calls close() can exhaust kernel memory.\\n\\nMove lock_sock_nested() to before the sk_state check so that the test\\nand the enqueue are atomic under the listener lock.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/smc/af_smc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9\",\"lessThan\":\"53c7938d8bcfde3296ec1a347ba2a9393c1fdcfa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9\",\"lessThan\":\"feb71634bb1abab3e8fb5cde874b27001cc1282e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9\",\"lessThan\":\"01865e1ddb126b25ac9eba5cdd7ec49e11183a64\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9\",\"lessThan\":\"00f89433777236ced4771211047fb5d4cd581cea\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9\",\"lessThan\":\"78e5ebcd1c10ed7c8bda0a99e0abd5b62da86d67\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9\",\"lessThan\":\"ff5bcd804b5bc5c64736b7d318c20e12ea9506b8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9\",\"lessThan\":\"185a4caeecabc150106deda1da170b09f2ad803f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d1d004585b40c212b338fc8a40cbaaf230ea4703\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.19.299\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/smc/af_smc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00f89433777236ced4771211047fb5d4cd581cea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/01865e1ddb126b25ac9eba5cdd7ec49e11183a64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/185a4caeecabc150106deda1da170b09f2ad803f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53c7938d8bcfde3296ec1a347ba2a9393c1fdcfa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78e5ebcd1c10ed7c8bda0a99e0abd5b62da86d67\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/feb71634bb1abab3e8fb5cde874b27001cc1282e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff5bcd804b5bc5c64736b7d318c20e12ea9506b8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:54:26+00:00",
      "cve": "CVE-2026-74692",
      "id": "CVE-2026-74692",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/smc: fix TOCTOU race between smc_listen_out() and listener close",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74692.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.