FKIE_CVE-2022-50457

Vulnerability from fkie_nvd - Published: 2025-10-01 12:15 - Updated: 2026-06-17 05:23
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: mtd: core: Fix refcount error in del_mtd_device() del_mtd_device() will call of_node_put() to mtd_get_of_node(mtd), which is mtd->dev.of_node. However, memset(&mtd->dev, 0) is called before of_node_put(). As the result, of_node_put() won't do anything in del_mtd_device(), and causes the refcount leak. del_mtd_device() memset(&mtd->dev, 0, sizeof(mtd->dev) # clear mtd->dev of_node_put() mtd_get_of_node(mtd) # mtd->dev is cleared, can't locate of_node # of_node_put(NULL) won't do anything Fix the error by caching the pointer of the device_node. OF: ERROR: memory leak, expected refcount 1 instead of 2, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /spi/spi-sram@0 CPU: 3 PID: 275 Comm: python3 Tainted: G N 6.1.0-rc3+ #54 0d8a1edddf51f172ff5226989a7565c6313b08e2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x67/0x83 kobject_get+0x155/0x160 of_node_get+0x1f/0x30 of_fwnode_get+0x43/0x70 fwnode_handle_get+0x54/0x80 fwnode_get_nth_parent+0xc9/0xe0 fwnode_full_name_string+0x3f/0xa0 device_node_string+0x30f/0x750 pointer+0x598/0x7a0 vsnprintf+0x62d/0x9b0 ... cfs_overlay_release+0x30/0x90 config_item_release+0xbe/0x1a0 config_item_put+0x5e/0x80 configfs_rmdir+0x3bd/0x540 vfs_rmdir+0x18c/0x320 do_rmdir+0x198/0x330 __x64_sys_rmdir+0x2c/0x40 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd [<miquel.raynal@bootlin.com>: Light reword of the commit log]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/56570bdad5e31c5c538cd6efff5c4510256e1bb4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/616dc895d982026f41f500c88d1bfea004938cc8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f6016557f1ef7735963bd8691592d2797bbf91d2Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdcore.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f6016557f1ef7735963bd8691592d2797bbf91d2",
              "status": "affected",
              "version": "00596576a05145a1b5672897a82ef87af00becf4",
              "versionType": "git"
            },
            {
              "lessThan": "616dc895d982026f41f500c88d1bfea004938cc8",
              "status": "affected",
              "version": "00596576a05145a1b5672897a82ef87af00becf4",
              "versionType": "git"
            },
            {
              "lessThan": "56570bdad5e31c5c538cd6efff5c4510256e1bb4",
              "status": "affected",
              "version": "00596576a05145a1b5672897a82ef87af00becf4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdcore.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2701BF1F-7C10-4D86-93E6-AA6DF5D8A6A3",
              "versionEndExcluding": "6.0.16",
              "versionStartIncluding": "5.17",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "77239F4B-6BB2-4B9E-A654-36A52396116C",
              "versionEndExcluding": "6.1.2",
              "versionStartIncluding": "6.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: core: Fix refcount error in del_mtd_device()\n\ndel_mtd_device() will call of_node_put() to mtd_get_of_node(mtd), which\nis mtd-\u003edev.of_node. However, memset(\u0026mtd-\u003edev, 0) is called before\nof_node_put(). As the result, of_node_put() won\u0027t do anything in\ndel_mtd_device(), and causes the refcount leak.\n\ndel_mtd_device()\n    memset(\u0026mtd-\u003edev, 0, sizeof(mtd-\u003edev) # clear mtd-\u003edev\n    of_node_put()\n        mtd_get_of_node(mtd) # mtd-\u003edev is cleared, can\u0027t locate of_node\n                             # of_node_put(NULL) won\u0027t do anything\n\nFix the error by caching the pointer of the device_node.\n\nOF: ERROR: memory leak, expected refcount 1 instead of 2,\nof_node_get()/of_node_put() unbalanced - destroy cset entry: attach\noverlay node /spi/spi-sram@0\nCPU: 3 PID: 275 Comm: python3 Tainted: G N 6.1.0-rc3+ #54\n    0d8a1edddf51f172ff5226989a7565c6313b08e2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\nrel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014\nCall Trace:\n\u003cTASK\u003e\n    dump_stack_lvl+0x67/0x83\n    kobject_get+0x155/0x160\n    of_node_get+0x1f/0x30\n    of_fwnode_get+0x43/0x70\n    fwnode_handle_get+0x54/0x80\n    fwnode_get_nth_parent+0xc9/0xe0\n    fwnode_full_name_string+0x3f/0xa0\n    device_node_string+0x30f/0x750\n    pointer+0x598/0x7a0\n    vsnprintf+0x62d/0x9b0\n    ...\n    cfs_overlay_release+0x30/0x90\n    config_item_release+0xbe/0x1a0\n    config_item_put+0x5e/0x80\n    configfs_rmdir+0x3bd/0x540\n    vfs_rmdir+0x18c/0x320\n    do_rmdir+0x198/0x330\n    __x64_sys_rmdir+0x2c/0x40\n    do_syscall_64+0x37/0x90\n    entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\n[\u003cmiquel.raynal@bootlin.com\u003e: Light reword of the commit log]"
    }
  ],
  "id": "CVE-2022-50457",
  "lastModified": "2026-06-17T05:23:35.617",
  "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": "2025-10-01T12:15:38.967",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/56570bdad5e31c5c538cd6efff5c4510256e1bb4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/616dc895d982026f41f500c88d1bfea004938cc8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/f6016557f1ef7735963bd8691592d2797bbf91d2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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