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

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-07-30 06:06
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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          "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."
        }
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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        {
          "url": "https://git.kernel.org/stable/c/9d160b35cc34a2ba8229d07651468a7848325135"
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      ],
      "title": "net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket",
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    "dateReserved": "2026-07-19T15:36:31.795Z",
    "dateUpdated": "2026-07-30T06:06:35.458Z",
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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": "2026-07-30T08:28:20+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"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-28T17:08:05Z",
      "cve": "CVE-2026-64541",
      "id": "CVE-2026-64541",
      "initial_release_date": "2026-07-28T17:08:05Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64541",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64541.json",
      "version": "2"
    }
  }
}



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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.