« Volver al listado

CVE-2025-21933

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

arm: pgtable: fix NULL pointer dereference issue

When update_mmu_cache_range() is called by update_mmu_cache(), the vmf parameter is NULL, which will cause a NULL pointer dereference issue in adjust_pte():

To fix it, do not rely on whether 'ptl' is equal to decide whether to hold the pte lock, but decide it by whether CONFIG_SPLIT_PTE_PTLOCKS is enabled. In addition, if two vmas map to the same PTE page, there is no need to hold the pte lock again, otherwise a deadlock will occur. Just add the need_lock parameter to let adjust_pte() know this information.

Detalles técnicos trazas, registros y código del informe original
Unable to handle kernel NULL pointer dereference at virtual address 00000030 when read
Hardware name: Atmel AT91SAM9
PC is at update_mmu_cache_range+0x1e0/0x278
LR is at pte_offset_map_rw_nolock+0x18/0x2c
Call trace:
 update_mmu_cache_range from remove_migration_pte+0x29c/0x2ec
 remove_migration_pte from rmap_walk_file+0xcc/0x130
 rmap_walk_file from remove_migration_ptes+0x90/0xa4
 remove_migration_ptes from migrate_pages_batch+0x6d4/0x858
 migrate_pages_batch from migrate_pages+0x188/0x488
 migrate_pages from compact_zone+0x56c/0x954
 compact_zone from compact_node+0x90/0xf0
 compact_node from kcompactd+0x1d4/0x204
 kcompactd from kthread+0x120/0x12c
 kthread from ret_from_fork+0x14/0x38
Exception stack(0xc0d8bfb0 to 0xc0d8bff8)

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-21933",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-21933",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-10-01T19:22:17.385365Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "fc9c45b71f43cafcc0435dd4c7a2d3b99955a0fa",
              "lessThan": "91d011efe30aedde067ce6d218d521cf99b162e5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "fc9c45b71f43cafcc0435dd4c7a2d3b99955a0fa",
              "lessThan": "a564ccfe300fa6a065beda06ab7f3c140d6b4d63",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/arm/mm/fault-armv.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.13",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.13.7",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/arm/mm/fault-armv.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-04-01T16:15:24.143",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/91d011efe30aedde067ce6d218d521cf99b162e5",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a564ccfe300fa6a065beda06ab7f3c140d6b4d63",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm: pgtable: fix NULL pointer dereference issue\n\nWhen update_mmu_cache_range() is called by update_mmu_cache(), the vmf\nparameter is NULL, which will cause a NULL pointer dereference issue in\nadjust_pte():\n\nUnable to handle kernel NULL pointer dereference at virtual address 00000030 when read\nHardware name: Atmel AT91SAM9\nPC is at update_mmu_cache_range+0x1e0/0x278\nLR is at pte_offset_map_rw_nolock+0x18/0x2c\nCall trace:\n update_mmu_cache_range from remove_migration_pte+0x29c/0x2ec\n remove_migration_pte from rmap_walk_file+0xcc/0x130\n rmap_walk_file from remove_migration_ptes+0x90/0xa4\n remove_migration_ptes from migrate_pages_batch+0x6d4/0x858\n migrate_pages_batch from migrate_pages+0x188/0x488\n migrate_pages from compact_zone+0x56c/0x954\n compact_zone from compact_node+0x90/0xf0\n compact_node from kcompactd+0x1d4/0x204\n kcompactd from kthread+0x120/0x12c\n kthread from ret_from_fork+0x14/0x38\nException stack(0xc0d8bfb0 to 0xc0d8bff8)\n\nTo fix it, do not rely on whether 'ptl' is equal to decide whether to hold\nthe pte lock, but decide it by whether CONFIG_SPLIT_PTE_PTLOCKS is\nenabled.  In addition, if two vmas map to the same PTE page, there is no\nneed to hold the pte lock again, otherwise a deadlock will occur.  Just\nadd the need_lock parameter to let adjust_pte() know this information."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm: pgtable: corregir problema de desreferencia de puntero NULL Cuando update_mmu_cache_range() es llamado por update_mmu_cache(), el parámetro vmf es NULL, lo que causará un problema de desreferencia de puntero NULL en adjust_pte(): No se puede gestionar la desreferencia de puntero NULL del kernel en la dirección virtual 00000030 cuando se lee Nombre del hardware: Atmel AT91SAM9 La PC está en update_mmu_cache_range+0x1e0/0x278 LR está en pte_offset_map_rw_nolock+0x18/0x2c Rastreo de llamadas: update_mmu_cache_range de remove_migration_pte+0x29c/0x2ec remove_migration_pte de rmap_walk_file+0xcc/0x130 rmap_walk_file de remove_migration_ptes+0x90/0xa4 remove_migration_ptes de migration_pages_batch+0x6d4/0x858 migration_pages_batch de migration_pages+0x188/0x488 migration_pages de compact_zone+0x56c/0x954 compact_zone de compact_node+0x90/0xf0 compact_node de kcompactd+0x1d4/0x204 kcompactd de kthread+0x120/0x12c kthread de ret_from_fork+0x14/0x38 Pila de excepciones (0xc0d8bfb0 a 0xc0d8bff8) Para solucionarlo, no confíe en si 'ptl' es igual para decidir si mantener el bloqueo pte, sino decídalo en función de si CONFIG_SPLIT_PTE_PTLOCKS está habilitado. Además, si dos máquinas virtuales asignan a la misma página PTE, no es necesario volver a bloquear la página PTE; de lo contrario, se producirá un bloqueo. Simplemente agregue el parámetro need_lock para que adjust_pte() conozca esta información."
    }
  ],
  "lastModified": "2026-06-17T08:44:38.860",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "842F5A44-3E71-4546-B4FD-43B0ACE3F32B",
              "versionEndExcluding": "6.13.7",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "66619FB8-0AAF-4166-B2CF-67B24143261D"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D3D6550E-6679-4560-902D-AF52DCFE905B"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "45B90F6B-BEC7-4D4E-883A-9DBADE021750"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}