Vulnerability-Lookup

FKIE_CVE-2025-38325

Vulnerability from fkie_nvd - Published: 2025-07-10 09:15 - Updated: 2026-07-30 06:23

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3890da762a66191c440b0bd6e3ee45501edbb0c1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3f3aae77280aad9f5acc6709c596148966f765c7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/52f5a52dc17a4a7b4363ac03fe2c4ef26f020dc6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a89f5fae998bdc4d0505306f93844c9ae059d50c	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.16
linux	linux_kernel	6.16

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/connection.c",
            "fs/smb/server/connection.h",
            "fs/smb/server/transport_rdma.c",
            "fs/smb/server/transport_tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
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              "version": "1aec4d14cf81b7b3e7b69eb1cfa94144eed7138e",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de",
              "versionType": "git"
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              "version": "e59796fc80603bcd8569d4d2e10b213c1918edb4",
              "versionType": "git"
            },
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              "versionType": "semver"
            },
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              "status": "affected",
              "version": "6.14.4",
              "versionType": "semver"
            }
          ]
        },
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          "product": "Linux",
          "programFiles": [
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            "fs/smb/server/connection.h",
            "fs/smb/server/transport_rdma.c",
            "fs/smb/server/transport_tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.15"
            },
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              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: add free_transport ops in ksmbd connection\n\nfree_transport function for tcp connection can be called from smbdirect.\nIt will cause kernel oops. This patch add free_transport ops in ksmbd\nconnection, and add each free_transports for tcp and smbdirect."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: se a\u00f1aden operaciones free_transport en la conexi\u00f3n ksmbd. La funci\u00f3n free_transport para la conexi\u00f3n TCP se puede llamar desde smbdirect. Esto provoca errores en el kernel. Este parche a\u00f1ade operaciones free_transport en la conexi\u00f3n ksmbd y a\u00f1ade free_transport tanto para TCP como para smbdirect."
    }
  ],
  "id": "CVE-2025-38325",
  "lastModified": "2026-07-30T06:23:07.353",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  },
  "published": "2025-07-10T09:15:26.673",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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    },
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "value": "NVD-CWE-noinfo"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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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

Title

ksmbd: add free_transport ops in ksmbd connection

Summary

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/52f5a52dc17a4a7b4…
https://git.kernel.org/stable/c/3890da762a66191c4…
https://git.kernel.org/stable/c/3f3aae77280aad9f5…
https://git.kernel.org/stable/c/a89f5fae998bdc4d0…

Impacted products

2 products

Vendor	Product	Version
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)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/connection.c",
            "fs/smb/server/connection.h",
            "fs/smb/server/transport_rdma.c",
            "fs/smb/server/transport_tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "52f5a52dc17a4a7b4363ac03fe2c4ef26f020dc6",
              "status": "affected",
              "version": "1da8bd9a10ecd718692732294d15fd801c0eabb5",
              "versionType": "git"
            },
            {
              "lessThan": "3890da762a66191c440b0bd6e3ee45501edbb0c1",
              "status": "affected",
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              "versionType": "git"
            },
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              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "6.14.4",
              "versionType": "semver"
            }
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        },
        {
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          "product": "Linux",
          "programFiles": [
            "fs/smb/server/connection.c",
            "fs/smb/server/connection.h",
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          ],
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          "vendor": "Linux",
          "versions": [
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            },
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        }
      ],
      "metrics": [
        {
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            "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 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:01:09.621Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/3f3aae77280aad9f5acc6709c596148966f765c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/a89f5fae998bdc4d0505306f93844c9ae059d50c"
        }
      ],
      "title": "ksmbd: add free_transport ops in ksmbd connection",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38325",
    "datePublished": "2025-07-10T08:14:59.544Z",
    "dateReserved": "2025-04-16T04:51:24.004Z",
    "dateUpdated": "2026-08-05T12:01:09.621Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.