FKIE_CVE-2025-38364

Vulnerability from fkie_nvd - Published: 2025-07-25 13:15 - Updated: 2026-06-17 09:16
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: maple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate() Temporarily clear the preallocation flag when explicitly requesting allocations. Pre-existing allocations are already counted against the request through mas_node_count_gfp(), but the allocations will not happen if the MA_STATE_PREALLOC flag is set. This flag is meant to avoid re-allocating in bulk allocation mode, and to detect issues with preallocation calculations. The MA_STATE_PREALLOC flag should also always be set on zero allocations so that detection of underflow allocations will print a WARN_ON() during consumption. User visible effect of this flaw is a WARN_ON() followed by a null pointer dereference when subsequent requests for larger number of nodes is ignored, such as the vma merge retry in mmap_region() caused by drivers altering the vma flags (which happens in v6.6, at least)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9e32f4700867abbd5d19abfcf698dbd0d2ce36a4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf95f8426f889949b738f51ffcd72884411f3a6aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d69cd64bd5af41c6fd409313504089970edaf02fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e63032e66bca1d06e600033f3369ba3db3af0870Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fba46a5d83ca8decb338722fb4899026d8d9ead2Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
0b142b55-0307-4c5a-b3c9-f314f3fb7c5ehttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
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
linux linux_kernel 6.16
debian debian_linux 11.0
To clipboard 

{
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          "programFiles": [
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            },
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              "status": "unaffected",
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            },
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    },
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          "vendor": "Siemens",
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          "vendor": "Siemens",
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            }
          ]
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      ],
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    }
  ],
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmaple_tree: fix MA_STATE_PREALLOC flag in mas_preallocate()\n\nTemporarily clear the preallocation flag when explicitly requesting\nallocations.  Pre-existing allocations are already counted against the\nrequest through mas_node_count_gfp(), but the allocations will not happen\nif the MA_STATE_PREALLOC flag is set.  This flag is meant to avoid\nre-allocating in bulk allocation mode, and to detect issues with\npreallocation calculations.\n\nThe MA_STATE_PREALLOC flag should also always be set on zero allocations\nso that detection of underflow allocations will print a WARN_ON() during\nconsumption.\n\nUser visible effect of this flaw is a WARN_ON() followed by a null pointer\ndereference when subsequent requests for larger number of nodes is\nignored, such as the vma merge retry in mmap_region() caused by drivers\naltering the vma flags (which happens in v6.6, at least)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: maple_tree: correcci\u00f3n del indicador MA_STATE_PREALLOC en mas_preallocate(). Borra temporalmente el indicador de preasignaci\u00f3n al solicitar asignaciones expl\u00edcitamente. Las asignaciones preexistentes ya se contabilizan en la solicitud mediante mas_node_count_gfp(), pero las asignaciones no se realizar\u00e1n si el indicador MA_STATE_PREALLOC est\u00e1 activado. Este indicador evita la reasignaci\u00f3n en modo de asignaci\u00f3n masiva y detecta problemas con los c\u00e1lculos de preasignaci\u00f3n. El indicador MA_STATE_PREALLOC debe estar siempre activado en asignaciones cero para que la detecci\u00f3n de asignaciones por desbordamiento imprima un WARN_ON() durante el consumo. El efecto visible para el usuario de esta falla es un WARN_ON() seguido de una desreferencia de puntero nulo cuando se ignoran solicitudes posteriores de un mayor n\u00famero de nodos, como el reintento de fusi\u00f3n de vma en mmap_region() causado por controladores que alteran los indicadores de vma (al menos en la versi\u00f3n 6.6)."
    }
  ],
  "id": "CVE-2025-38364",
  "lastModified": "2026-06-17T09:16:42.670",
  "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"
      }
    ]
  },
  "published": "2025-07-25T13:15:25.260",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/9e32f4700867abbd5d19abfcf698dbd0d2ce36a4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "tags": [
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    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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  • 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.
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  • 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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