CVE-2026-64541 (GCVE-0-2026-64541)

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-08-05 12:42
VLAI
Title
net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket smc_cdc_rx_handler() looks up the connection by token under the link group's conns_lock, drops the lock, and then dereferences conn and the smc_sock derived from it, ending in sock_hold(&smc->sk) inside smc_cdc_msg_recv(). No reference is held across the lock release. The only reference pinning the socket while the connection is discoverable in the link group is taken in smc_lgr_register_conn() (sock_hold) and dropped in __smc_lgr_unregister_conn() (sock_put), both under conns_lock. Once the handler drops conns_lock, a concurrent close() -> smc_release() -> smc_conn_free() -> smc_lgr_unregister_conn() can drop that reference and free the smc_sock, so the handler's later sock_hold() runs on freed memory: WARNING: lib/refcount.c:25 at refcount_warn_saturate Workqueue: rxe_wq do_work refcount_warn_saturate (lib/refcount.c:25) smc_cdc_msg_recv (net/smc/smc_cdc.c:430) smc_cdc_rx_handler (net/smc/smc_cdc.c:502) smc_wr_rx_tasklet_fn (net/smc/smc_wr.c:445) tasklet_action_common (kernel/softirq.c:938) handle_softirqs (kernel/softirq.c:622) Kernel panic - not syncing: panic_on_warn set Only SMC-R is affected. The SMC-D receive tasklet is stopped by tasklet_kill(&conn->rx_tsklet) in smc_conn_free() before the connection is unregistered, so it cannot run concurrently with the free. Take the socket reference while still holding conns_lock, so the registration reference can no longer be the last one, and drop it once the handler is done.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 8de4f665d0febfb92803dece377791a563fc7041 (git)
Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 8145b432136285e01091815b48ceb2dae261f262 (git)
Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 1951bffbc6493ec34cff3956b29d4bc6606904a6 (git)
Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 647b19e5cc145a2f1f685ae8ff3805a17356888c (git)
Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 472e9d7c0d5b03be3ff91ff941f57da822b031bc (git)
Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 3bfb96d9bc6a7ed0b99c7db329cc2e22a28d84bb (git)
Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < ce5aa8084329351086894aa34d77e40301d5bd3d (git)
Affected: d7b0e37c1ac152905b18a5b9506179091a35b0b6 , < 9d160b35cc34a2ba8229d07651468a7848325135 (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc3 , ≤ * (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 UAF in smc_cdc_rx_handler() by pinning the socket\n\nsmc_cdc_rx_handler() looks up the connection by token under the link\ngroup\u0027s conns_lock, drops the lock, and then dereferences conn and the\nsmc_sock derived from it, ending in sock_hold(\u0026smc-\u003esk) inside\nsmc_cdc_msg_recv(). No reference is held across the lock release.\n\nThe only reference pinning the socket while the connection is\ndiscoverable in the link group is taken in smc_lgr_register_conn()\n(sock_hold) and dropped in __smc_lgr_unregister_conn() (sock_put), both\nunder conns_lock. Once the handler drops conns_lock, a concurrent\nclose() -\u003e smc_release() -\u003e smc_conn_free() -\u003e smc_lgr_unregister_conn()\ncan drop that reference and free the smc_sock, so the handler\u0027s later\nsock_hold() runs on freed memory:\n\n  WARNING: lib/refcount.c:25 at refcount_warn_saturate\n  Workqueue: rxe_wq do_work\n   refcount_warn_saturate (lib/refcount.c:25)\n   smc_cdc_msg_recv (net/smc/smc_cdc.c:430)\n   smc_cdc_rx_handler (net/smc/smc_cdc.c:502)\n   smc_wr_rx_tasklet_fn (net/smc/smc_wr.c:445)\n   tasklet_action_common (kernel/softirq.c:938)\n   handle_softirqs (kernel/softirq.c:622)\n  Kernel panic - not syncing: panic_on_warn set\n\nOnly SMC-R is affected. The SMC-D receive tasklet is stopped by\ntasklet_kill(\u0026conn-\u003erx_tsklet) in smc_conn_free() before the connection\nis unregistered, so it cannot run concurrently with the free.\n\nTake the socket reference while still holding conns_lock, so the\nregistration reference can no longer be the last one, and drop it once\nthe handler is done."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable handler is driven entirely by a CDC control message sent by the remote SMC-R peer over the RDMA link, with an attacker-chosen `token` field and no local syscall involvement. SMC-R runs over RoCEv2 (IP/UDP-routable, port 4791) with the CLC handshake over plain TCP, and SMC-Rv2 explicitly supports non-local/routed peers, so the attacker need not share an L2 segment.\nAC:L - The attacker controls both sides of the race: it chooses when to emit CDC messages and which connection to target (the alert token is disclosed to it in the CLC accept/confirm), and it can drive the teardown side itself via CDC close/abort flags into `smc_close_passive_work()` or a stale seqno with `failover_validation` into `abort_work` -\u003e `smc_conn_kill()`. The race can be retried indefinitely across many connections in the same link group, and was reproduced in practice with soft-RoCE.\nPR:N - Establishing an SMC-R connection to a listening SMC socket requires no credentials \u2014 SMC has no authentication layer of its own, exactly like plain TCP. Everything after connection establishment (sending CDC messages with a chosen token, signalling close/abort) is available to an unauthenticated peer.\nUI:N - The CDC message is processed in a softirq tasklet from the RDMA completion queue with no involvement from any local user or application action. No victim interaction of any kind is needed.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed. This is a standard in-kernel use-after-free.\nC:H - The freed `smc_sock` is reused type-safely as another live socket, so attacker-supplied cursors applied by `smc_cdc_msg_recv_action()` break the `0 \u003c= bytes_to_rcv \u003c= rmb_desc-\u003elen` invariant and make `smc_rx_recvmsg()` hand stale RMB contents to userspace, while the urgent-data path reads `*(base + conn-\u003eurg_curs.count - 1)` at an attacker-chosen offset. Once the slab page is reclaimed after the RCU grace period, reuse is unconstrained, giving a general kernel-memory read primitive.\nI:H - `sock_hold()` on an already-zero refcount followed by `sock_put()` re-enters `sk_free()`, yielding a double free, and the handler additionally writes `sk_err`/`sk_shutdown`, makes indirect calls through `sk_data_ready()`/`sk_write_space()`, and `queue_work()`s a freed `work_struct`. These are classic heap-spray and control-flow-hijack primitives leading to arbitrary kernel write.\nA:H - The reported symptom is `refcount_warn_saturate` from `smc_cdc_msg_recv()`, which is an immediate kernel panic on `panic_on_warn` systems, and dereferencing freed memory in softirq context otherwise oopses. The attacker can trigger it repeatedly without authentication."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:42:49.565Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8de4f665d0febfb92803dece377791a563fc7041"
        },
        {
          "url": "https://git.kernel.org/stable/c/8145b432136285e01091815b48ceb2dae261f262"
        },
        {
          "url": "https://git.kernel.org/stable/c/1951bffbc6493ec34cff3956b29d4bc6606904a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/647b19e5cc145a2f1f685ae8ff3805a17356888c"
        },
        {
          "url": "https://git.kernel.org/stable/c/472e9d7c0d5b03be3ff91ff941f57da822b031bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bfb96d9bc6a7ed0b99c7db329cc2e22a28d84bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce5aa8084329351086894aa34d77e40301d5bd3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d160b35cc34a2ba8229d07651468a7848325135"
        }
      ],
      "title": "net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64541",
    "datePublished": "2026-07-27T20:10:34.439Z",
    "dateReserved": "2026-07-19T15:36:31.795Z",
    "dateUpdated": "2026-08-05T12:42:49.565Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64541",
      "date": "2026-08-09",
      "epss": "0.00521",
      "percentile": "0.41404"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64541\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-27T21:17:06.570\",\"lastModified\":\"2026-07-30T06:25:57.950\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket\\n\\nsmc_cdc_rx_handler() looks up the connection by token under the link\\ngroup\u0027s conns_lock, drops the lock, and then dereferences conn and the\\nsmc_sock derived from it, ending in sock_hold(\u0026smc-\u003esk) inside\\nsmc_cdc_msg_recv(). No reference is held across the lock release.\\n\\nThe only reference pinning the socket while the connection is\\ndiscoverable in the link group is taken in smc_lgr_register_conn()\\n(sock_hold) and dropped in __smc_lgr_unregister_conn() (sock_put), both\\nunder conns_lock. Once the handler drops conns_lock, a concurrent\\nclose() -\u003e smc_release() -\u003e smc_conn_free() -\u003e smc_lgr_unregister_conn()\\ncan drop that reference and free the smc_sock, so the handler\u0027s later\\nsock_hold() runs on freed memory:\\n\\n  WARNING: lib/refcount.c:25 at refcount_warn_saturate\\n  Workqueue: rxe_wq do_work\\n   refcount_warn_saturate (lib/refcount.c:25)\\n   smc_cdc_msg_recv (net/smc/smc_cdc.c:430)\\n   smc_cdc_rx_handler (net/smc/smc_cdc.c:502)\\n   smc_wr_rx_tasklet_fn (net/smc/smc_wr.c:445)\\n   tasklet_action_common (kernel/softirq.c:938)\\n   handle_softirqs (kernel/softirq.c:622)\\n  Kernel panic - not syncing: panic_on_warn set\\n\\nOnly SMC-R is affected. The SMC-D receive tasklet is stopped by\\ntasklet_kill(\u0026conn-\u003erx_tsklet) in smc_conn_free() before the connection\\nis unregistered, so it cannot run concurrently with the free.\\n\\nTake the socket reference while still holding conns_lock, so the\\nregistration reference can no longer be the last one, and drop it once\\nthe handler is done.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/smc/smc_cdc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d7b0e37c1ac152905b18a5b9506179091a35b0b6\",\"lessThan\":\"8de4f665d0febfb92803dece377791a563fc7041\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7b0e37c1ac152905b18a5b9506179091a35b0b6\",\"lessThan\":\"8145b432136285e01091815b48ceb2dae261f262\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7b0e37c1ac152905b18a5b9506179091a35b0b6\",\"lessThan\":\"1951bffbc6493ec34cff3956b29d4bc6606904a6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7b0e37c1ac152905b18a5b9506179091a35b0b6\",\"lessThan\":\"647b19e5cc145a2f1f685ae8ff3805a17356888c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7b0e37c1ac152905b18a5b9506179091a35b0b6\",\"lessThan\":\"472e9d7c0d5b03be3ff91ff941f57da822b031bc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7b0e37c1ac152905b18a5b9506179091a35b0b6\",\"lessThan\":\"3bfb96d9bc6a7ed0b99c7db329cc2e22a28d84bb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7b0e37c1ac152905b18a5b9506179091a35b0b6\",\"lessThan\":\"ce5aa8084329351086894aa34d77e40301d5bd3d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7b0e37c1ac152905b18a5b9506179091a35b0b6\",\"lessThan\":\"9d160b35cc34a2ba8229d07651468a7848325135\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/smc/smc_cdc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"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:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1951bffbc6493ec34cff3956b29d4bc6606904a6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3bfb96d9bc6a7ed0b99c7db329cc2e22a28d84bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/472e9d7c0d5b03be3ff91ff941f57da822b031bc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/647b19e5cc145a2f1f685ae8ff3805a17356888c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8145b432136285e01091815b48ceb2dae261f262\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8de4f665d0febfb92803dece377791a563fc7041\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d160b35cc34a2ba8229d07651468a7848325135\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce5aa8084329351086894aa34d77e40301d5bd3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T12:17:02+00:00",
      "cve": "CVE-2026-64541",
      "id": "CVE-2026-64541",
      "initial_release_date": "2026-07-27T00:00:00+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 UAF in smc_cdc_rx_handler() by pinning the socket",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64541.json",
      "version": "3"
    }
  }
}



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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.