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CVE-2025-38325 (GCVE-0-2025-38325)

Vulnerability from cvelistv5 – Published: 2025-07-10 08:14 – Updated: 2026-08-05 12:01
VLAI
Title
ksmbd: add free_transport ops in ksmbd connection
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: add free_transport ops in ksmbd connection free_transport function for tcp connection can be called from smbdirect. It will cause kernel oops. This patch add free_transport ops in ksmbd connection, and add each free_transports for tcp and smbdirect.
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 CPE status
Linux Linux Affected: 1da8bd9a10ecd718692732294d15fd801c0eabb5 , < 52f5a52dc17a4a7b4363ac03fe2c4ef26f020dc6 (git)
Affected: 1aec4d14cf81b7b3e7b69eb1cfa94144eed7138e , < 3890da762a66191c440b0bd6e3ee45501edbb0c1 (git)
Affected: 21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de , < 3f3aae77280aad9f5acc6709c596148966f765c7 (git)
Affected: 21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de , < a89f5fae998bdc4d0505306f93844c9ae059d50c (git)
Affected: e59796fc80603bcd8569d4d2e10b213c1918edb4 (git)
Affected: 6.12.26 , < 6.12.35 (semver)
Affected: 6.14.4 , < 6.15 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.12.35 , ≤ 6.12.* (semver)
Unaffected: 6.15.4 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:N - The vulnerable teardown path belongs to ksmbd\u0027s in-kernel SMB Direct transport, whose RDMA CM listener accepts connections from remote peers on port 445 (InfiniBand) / 5445 (iWARP), and is reachable over routable IP via iWARP/RoCEv2 or software providers (siw/rxe). No local access is needed \u2014 a remote peer triggers it by establishing and dropping an SMB Direct connection.\nAC:L - The type confusion is deterministic \u2014 every SMB Direct connection teardown funnels through ksmbd_conn_free() \u2192 ksmbd_free_transport() and fabricates a socket pointer from the status/full_packet_received bytes, with no race or memory-layout precondition. The premature-free variant simply requires holding an oplock/lease at disconnect time, which the attacker fully controls.\nPR:N - Connection setup and teardown happen entirely before SMB2 SESSION_SETUP: the error path in smb_direct_handle_connect_request() and the normal ksmbd_conn_handler_loop() exit both call free_transport() with no credentials verified. An unauthenticated peer that connects and disconnects triggers the confused free.\nUI:N - The attacker drives the entire sequence by opening and closing an SMB Direct connection; no action by any local user or administrator is required beyond ksmbd already serving SMB Direct.\nS:U - The corruption is confined to kernel memory managed by the ksmbd server within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The type confusion plus the unconditional kfree(t) in the RDMA free_transport() leave conn-\u003etransport dangling and double-free the slab object, giving a use-after-free on a large kmalloc allocation that an attacker can reclaim and read back through ksmbd_conn_write()/rdma_read paths, which is leverageable for arbitrary kernel memory disclosure.\nI:H - This is a genuine type confusion combined with a double free and a use-after-free whose reuse ends in an indirect call through freed memory (conn-\u003etransport-\u003eops-\u003ewritev in __smb2_lease_break_noti()), a direct control-flow hijack primitive once the freed object is groomed.\nA:H - Every SMB Direct teardown calls sock_release() on a fabricated pointer built from the status enum, producing a guaranteed kernel oops that kills the ksmbd kthread and leaks its RDMA resources, and panics outright on panic_on_oops configurations common in appliances and embedded deployments."
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    "datePublished": "2025-07-10T08:14:59.544Z",
    "dateReserved": "2025-04-16T04:51:24.004Z",
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Este parche a\u00f1ade operaciones free_transport en la conexi\u00f3n ksmbd y a\u00f1ade free_transport tanto para TCP como para 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:22:32+00:00",
      "cve": "CVE-2025-38325",
      "id": "CVE-2025-38325",
      "initial_release_date": "2025-07-10T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: add free_transport ops in ksmbd connection",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38325.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:55:31Z",
      "cve": "CVE-2025-38325",
      "id": "CVE-2025-38325",
      "initial_release_date": "2025-07-10T23:22:32Z",
      "product_status:known_not_affected": "524",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38325",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38325.json",
      "version": "9"
    }
  }
}



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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.

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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.
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  • 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.


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