Vulnerability-Lookup

FKIE_CVE-2025-38191

Vulnerability from fkie_nvd - Published: 2025-07-04 14:15 - Updated: 2026-07-30 06:22

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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: fix null pointer dereference in destroy_previous_session If client set ->PreviousSessionId on kerberos session setup stage, NULL pointer dereference error will happen. Since sess->user is not set yet, It can pass the user argument as NULL to destroy_previous_session. sess->user will be set in ksmbd_krb5_authenticate(). So this patch move calling destroy_previous_session() after ksmbd_krb5_authenticate().

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/076f1adefb9837977af7ed233883842ddc446644	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0902625a24eea7fdc187faa5d97df244d159dd6e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1193486dffb7432a09f57f5d09049b4d4123538b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/281afc52e2961cd5dd8326ebc9c5bc40904c0468	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7ac5b66acafcc9292fb935d7e03790f2b8b2dc0e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://www.zerodayinitiative.com/advisories/ZDI-25-610/	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.16
linux	linux_kernel	6.16
debian	debian_linux	11.0

JSON

To clipboard

{
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        }
      ],
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    }
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix null pointer dereference in destroy_previous_session\n\nIf client set -\u003ePreviousSessionId on kerberos session setup stage,\nNULL pointer dereference error will happen. Since sess-\u003euser is not\nset yet, It can pass the user argument as NULL to destroy_previous_session.\nsess-\u003euser will be set in ksmbd_krb5_authenticate(). So this patch move\ncalling destroy_previous_session() after ksmbd_krb5_authenticate()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: se corrige la desreferencia de puntero nulo en destroy_previous_session. Si el cliente configura -\u0026gt;PreviousSessionId durante la configuraci\u00f3n de la sesi\u00f3n Kerberos, se producir\u00e1 un error de desreferencia de puntero nulo. Dado que sess-\u0026gt;user a\u00fan no est\u00e1 configurado, se puede pasar el argumento de usuario como nulo a destroy_previous_session. Sess-\u0026gt;user se configurar\u00e1 en ksmbd_krb5_authenticate(). Por lo tanto, este parche modifica la llamada a destroy_previous_session() despu\u00e9s de ksmbd_krb5_authenticate()."
    }
  ],
  "id": "CVE-2025-38191",
  "lastModified": "2026-07-30T06:22:59.013",
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          "confidentialityImpact": "NONE",
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}

CVE-2025-38191 (GCVE-0-2025-38191)

Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2026-08-05 12:00

Title

ksmbd: fix null pointer dereference in destroy_previous_session

Summary

Severity

7.5 (High)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/281afc52e2961cd5d…
https://git.kernel.org/stable/c/0902625a24eea7fdc…
https://git.kernel.org/stable/c/1193486dffb7432a0…
https://git.kernel.org/stable/c/076f1adefb9837977…
https://git.kernel.org/stable/c/7ac5b66acafcc9292…
https://www.zerodayinitiative.com/advisories/ZDI-…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 281afc52e2961cd5dd8326ebc9c5bc40904c0468 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 0902625a24eea7fdc187faa5d97df244d159dd6e (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 1193486dffb7432a09f57f5d09049b4d4123538b (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 076f1adefb9837977af7ed233883842ddc446644 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 7ac5b66acafcc9292fb935d7e03790f2b8b2dc0e (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.95 , ≤ 6.6.* (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": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:35:15.212Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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              "value": "AV:N - ksmbd is the in-kernel SMB3 server processing SMB2 SESSION_SETUP requests over TCP port 445; the malformed PreviousSessionId arrives from a remote network peer.\nAC:L - The attacker deterministically controls both the prior session and the second connection\u0027s PreviousSessionId with no race or uncontrolled memory-layout dependency; the NULL deref triggers reliably.\nPR:N - The crash occurs during the Kerberos handshake before the second connection\u0027s credentials are verified, and the required prior session can be created pre-authentication in a reasonable deployment (guest access), so no privileges are needed.\nUI:N - Exploitation requires only attacker-sent SMB2 packets; no action by any local user or victim is needed.\nS:U - The NULL dereference crashes the kernel within its own security scope; no boundary (VM, IOMMU, sandbox) is crossed.\nC:N - A NULL pointer dereference is a pure crash that discloses no memory contents or kernel data.\nI:N - The bug provides no write primitive or data modification; it only faults on a NULL read of user-\u003ename.\nA:H - The NULL dereference causes a kernel oops/panic, taking down the SMB server and the host, and can be triggered repeatedly."
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      "title": "ksmbd: fix null pointer dereference in destroy_previous_session",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38191",
    "datePublished": "2025-07-04T13:37:15.736Z",
    "dateReserved": "2025-04-16T04:51:23.993Z",
    "dateUpdated": "2026-08-05T12:00:16.004Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

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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.

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