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CVE-2023-53006 (GCVE-0-2023-53006)

Vulnerability from cvelistv5 – Published: 2025-03-27 16:43 – Updated: 2026-08-05 09:12
VLAI
Title
cifs: Fix oops due to uncleared server->smbd_conn in reconnect
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix oops due to uncleared server->smbd_conn in reconnect In smbd_destroy(), clear the server->smbd_conn pointer after freeing the smbd_connection struct that it points to so that reconnection doesn't get confused.
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8ef130f9ec27973f7b49e20c5a3b9134ca33026c , < a9640c0b268405f2540e8203a545e930ea88bb7d (git)
Affected: 8ef130f9ec27973f7b49e20c5a3b9134ca33026c , < 91be54849d5392050f5b847b42bd5e6221551ac8 (git)
Affected: 8ef130f9ec27973f7b49e20c5a3b9134ca33026c , < e037baee16e0b9ace7e730888fcae9cec11daff2 (git)
Affected: 8ef130f9ec27973f7b49e20c5a3b9134ca33026c , < 4b83bc6f87eedab4599b0123e572a422689444be (git)
Affected: 8ef130f9ec27973f7b49e20c5a3b9134ca33026c , < 5109607a4ece7cd8536172bf7549eb4dce1f3576 (git)
Affected: 8ef130f9ec27973f7b49e20c5a3b9134ca33026c , < b7ab9161cf5ddc42a288edf9d1a61f3bdffe17c7 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 4.19.272 , ≤ 4.19.* (semver)
Unaffected: 5.4.231 , ≤ 5.4.* (semver)
Unaffected: 5.10.166 , ≤ 5.10.* (semver)
Unaffected: 5.15.91 , ≤ 5.15.* (semver)
Unaffected: 6.1.9 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website

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              "value": "AV:N - The UAF is in the CIFS client\u0027s SMB Direct reconnect path (`cifs_abort_connection` \u2192 `smbd_destroy` \u2192 `smbd_reconnect`), driven by a remote peer dropping the RDMA/iWARP connection; iWARP/RoCEv2 are IP-reachable so a malicious or compromised SMB Direct server is a network attacker.\nAC:L - After any disconnect, `__cifs_reconnect` deterministically frees `smbd_conn` then immediately dereferences the dangling pointer in `smbd_reconnect`; the remote peer forces disconnects at will and can retry unboundedly every reconnect cycle.\nPR:N - The attacker is the remote SMB Direct server (or on-path peer) and needs no account or privileges on the victim; the vulnerable abort/reconnect runs in the cifsd kernel thread on the transport before SMB re-authentication.\nUI:N - Against an already-mounted `rdma` CIFS share (typical fstab/autofs enterprise setup), cifsd automatically reconnects on peer disconnect with no victim action at exploit time.\nS:U - The use-after-free corrupts host kernel heap (`smbd_connection` in kmalloc-4k) within the same OS security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free of the heap-allocated `smbd_connection`; reclaim/grooming of the freed object lets the reconnect path read attacker-influenced fields (e.g. `transport_status`), yielding a kernel disclosure primitive per UAF guidance.\nI:H - If the reclaimed object presents `transport_status == SMBD_CONNECTED`, `smbd_destroy` runs RDMA teardown (disconnect, QP drain, frees) on attacker-controlled structure fields, giving a classic heap UAF write/control-flow hijack primitive.\nA:H - The dangling `server-\u003esmbd_conn` dereference is a confirmed KASAN use-after-free/oops in `smbd_reconnect` during reconnect and is repeatedly triggerable by peer disconnects."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:12:20.807Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2023-53006",
    "datePublished": "2025-03-27T16:43:37.225Z",
    "dateReserved": "2025-03-27T16:40:15.745Z",
    "dateUpdated": "2026-08-05T09:12:20.807Z",
    "state": "PUBLISHED"
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En smbd_destroy(), borra el puntero server-\u0026gt;smbd_conn despu\u00e9s de liberar la estructura smbd_connection a la que apunta para que la reconexi\u00f3n no se 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:24:27+00:00",
      "cve": "CVE-2023-53006",
      "id": "CVE-2023-53006",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cifs: Fix oops due to uncleared server-\u003esmbd_conn in reconnect",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53006.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:10:32Z",
      "cve": "CVE-2023-53006",
      "id": "CVE-2023-53006",
      "initial_release_date": "2025-03-28T03:38:01Z",
      "product_status:known_affected": "496",
      "product_status:known_not_affected": "130",
      "product_status:recommended": "277",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53006",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53006.json",
      "version": "27"
    }
  }
}



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