Vulnerability-Lookup

FKIE_CVE-2025-39736

Vulnerability from fkie_nvd - Published: 2025-09-11 17:15 - Updated: 2026-11-05 22:17

Severity

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: mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock When netpoll is enabled, calling pr_warn_once() while holding kmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock inversion with the netconsole subsystem. This occurs because pr_warn_once() may trigger netpoll, which eventually leads to __alloc_skb() and back into kmemleak code, attempting to reacquire kmemleak_lock. This is the path for the deadlock. mem_pool_alloc() -> raw_spin_lock_irqsave(&kmemleak_lock, flags); -> pr_warn_once() -> netconsole subsystem -> netpoll -> __alloc_skb -> __create_object -> raw_spin_lock_irqsave(&kmemleak_lock, flags); Fix this by setting a flag and issuing the pr_warn_once() after kmemleak_lock is released.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Mailing List, Third Party Advisory
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-032379.html

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.17
debian	debian_linux	11.0

JSON

To clipboard

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              "lessThanOrEqual": "6.6.*",
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              "version": "6.6.103",
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    },
    {
      "affectedData": [
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          "defaultStatus": "unknown",
          "product": "SIMATIC CN 4100",
          "vendor": "Siemens",
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            {
              "lessThan": "V5.0",
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              "version": "0",
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            }
          ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock\n\nWhen netpoll is enabled, calling pr_warn_once() while holding\nkmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock\ninversion with the netconsole subsystem.  This occurs because\npr_warn_once() may trigger netpoll, which eventually leads to\n__alloc_skb() and back into kmemleak code, attempting to reacquire\nkmemleak_lock.\n\nThis is the path for the deadlock.\n\nmem_pool_alloc()\n  -\u003e raw_spin_lock_irqsave(\u0026kmemleak_lock, flags);\n      -\u003e pr_warn_once()\n          -\u003e netconsole subsystem\n\t     -\u003e netpoll\n\t         -\u003e __alloc_skb\n\t\t   -\u003e __create_object\n\t\t     -\u003e raw_spin_lock_irqsave(\u0026kmemleak_lock, flags);\n\nFix this by setting a flag and issuing the pr_warn_once() after\nkmemleak_lock is released."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/kmemleak: evitar interbloqueo moviendo pr_warn() fuera de kmemleak_lock\n\nCuando netpoll est\u00e1 habilitado, llamar a pr_warn_once() mientras se mantiene kmemleak_lock en mem_pool_alloc() puede causar un interbloqueo debido a la inversi\u00f3n de bloqueo con el subsistema netconsole. Esto ocurre porque pr_warn_once() puede activar netpoll, lo que eventualmente lleva a __alloc_skb() y de vuelta al c\u00f3digo de kmemleak, intentando readquirir kmemleak_lock.\n\nEste es el camino para el interbloqueo.\n\nmem_pool_alloc()\n  -\u003e raw_spin_lock_irqsave(\u0026kmemleak_lock, flags);\n      -\u003e pr_warn_once()\n          -\u003e subsistema netconsole\n\t     -\u003e netpoll\n\t         -\u003e __alloc_skb\n\t\t   -\u003e __create_object\n\t\t     -\u003e raw_spin_lock_irqsave(\u0026kmemleak_lock, flags);\n\nSolucione esto estableciendo una bandera y emitiendo el pr_warn_once() despu\u00e9s de que kmemleak_lock sea liberado."
    }
  ],
  "id": "CVE-2025-39736",
  "lastModified": "2026-11-05T22:17:28.900",
  "metrics": {
    "cvssMetricV31": [
      {
        "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"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-39736",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-11-05T21:08:53.202255Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-09-11T17:15:34.840",
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
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      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-39736 (GCVE-0-2025-39736)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:52 – Updated: 2026-11-05 21:12

Title

mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock

Summary

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-05 21:08 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6639 records in the last 180 days details

References

12 references

URL	Tags
https://git.kernel.org/stable/c/c7b6ea0ede687e746…
https://git.kernel.org/stable/c/4b0151e1d468eb266…
https://git.kernel.org/stable/c/f249d32bb54876b4b…
https://git.kernel.org/stable/c/62879faa8efe8d8a9…
https://git.kernel.org/stable/c/1da95d3d4b7b1d380…
https://git.kernel.org/stable/c/a0854de00ce2ee27e…
https://git.kernel.org/stable/c/08f70be5e406ce47c…
https://git.kernel.org/stable/c/a181b228b37a6a562…
https://git.kernel.org/stable/c/47b0f6d8f0d2be4d3…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

3 products

Vendor	Product	Version
Linux	Linux	Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < c7b6ea0ede687e7460e593c5ea478f50aa41682a (git) Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 4b0151e1d468eb2667c37b7af99b3c075072d334 (git) Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < f249d32bb54876b4b6c3ae071af8ddca77af390b (git) Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 62879faa8efe8d8a9c7bf7606ee9c068012d7dac (git) Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d (git) Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < a0854de00ce2ee27edf39037e7836ad580eb3350 (git) Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 08f70be5e406ce47c822f2dd11c1170ca259605b (git) Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < a181b228b37a6a5625dad2bb4265bb7abb673e9f (git) Affected: c5665868183fec689dbab9fb8505188b2c4f0757 , < 47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2 (git)
Linux	Linux	Affected: 5.4 Unaffected: 0 , < 5.4 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.149 , ≤ 6.1.* (semver) Unaffected: 6.6.103 , ≤ 6.6.* (semver) Unaffected: 6.12.43 , ≤ 6.12.* (semver) Unaffected: 6.15.11 , ≤ 6.15.* (semver) Unaffected: 6.16.2 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC CN 4100	Affected: 0 , < V5.0 (custom)

Show details on NVD website

JSON

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                "id": "CVE-2025-39736",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
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                "role": "CISA Coordinator",
                "timestamp": "2026-11-05T21:08:53.202255Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            },
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              "versionType": "semver"
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}

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

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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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