CVE-2022-50751 (GCVE-0-2022-50751)
Vulnerability from cvelistv5
Published
2025-12-24 13:05
Modified
2025-12-24 13:05
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: configfs: fix possible memory leak in configfs_create_dir() kmemleak reported memory leaks in configfs_create_dir(): unreferenced object 0xffff888009f6af00 (size 192): comm "modprobe", pid 3777, jiffies 4295537735 (age 233.784s) backtrace: kmem_cache_alloc (mm/slub.c:3250 mm/slub.c:3256 mm/slub.c:3263 mm/slub.c:3273) new_fragment (./include/linux/slab.h:600 fs/configfs/dir.c:163) configfs_register_subsystem (fs/configfs/dir.c:1857) basic_write (drivers/hwtracing/stm/p_basic.c:14) stm_p_basic do_one_initcall (init/main.c:1296) do_init_module (kernel/module/main.c:2455) ... unreferenced object 0xffff888003ba7180 (size 96): comm "modprobe", pid 3777, jiffies 4295537735 (age 233.784s) backtrace: kmem_cache_alloc (mm/slub.c:3250 mm/slub.c:3256 mm/slub.c:3263 mm/slub.c:3273) configfs_new_dirent (./include/linux/slab.h:723 fs/configfs/dir.c:194) configfs_make_dirent (fs/configfs/dir.c:248) configfs_create_dir (fs/configfs/dir.c:296) configfs_attach_group.isra.28 (fs/configfs/dir.c:816 fs/configfs/dir.c:852) configfs_register_subsystem (fs/configfs/dir.c:1881) basic_write (drivers/hwtracing/stm/p_basic.c:14) stm_p_basic do_one_initcall (init/main.c:1296) do_init_module (kernel/module/main.c:2455) ... This is because the refcount is not correct in configfs_make_dirent(). For normal stage, the refcount is changing as: configfs_register_subsystem() configfs_create_dir() configfs_make_dirent() configfs_new_dirent() # set s_count = 1 dentry->d_fsdata = configfs_get(sd); # s_count = 2 ... configfs_unregister_subsystem() configfs_remove_dir() remove_dir() configfs_remove_dirent() # s_count = 1 dput() ... *dentry_unlink_inode()* configfs_d_iput() # s_count = 0, release However, if we failed in configfs_create(): configfs_register_subsystem() configfs_create_dir() configfs_make_dirent() # s_count = 2 ... configfs_create() # fail ->out_remove: configfs_remove_dirent(dentry) configfs_put(sd) # s_count = 1 return PTR_ERR(inode); There is no inode in the error path, so the configfs_d_iput() is lost and makes sd and fragment memory leaked. To fix this, when we failed in configfs_create(), manually call configfs_put(sd) to keep the refcount correct.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/configfs/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "product": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.16"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.4.229",
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              "version": "5.10.163",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.86",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: fix possible memory leak in configfs_create_dir()\n\nkmemleak reported memory leaks in configfs_create_dir():\n\nunreferenced object 0xffff888009f6af00 (size 192):\n  comm \"modprobe\", pid 3777, jiffies 4295537735 (age 233.784s)\n  backtrace:\n    kmem_cache_alloc (mm/slub.c:3250 mm/slub.c:3256 mm/slub.c:3263 mm/slub.c:3273)\n    new_fragment (./include/linux/slab.h:600 fs/configfs/dir.c:163)\n    configfs_register_subsystem (fs/configfs/dir.c:1857)\n    basic_write (drivers/hwtracing/stm/p_basic.c:14) stm_p_basic\n    do_one_initcall (init/main.c:1296)\n    do_init_module (kernel/module/main.c:2455)\n    ...\n\nunreferenced object 0xffff888003ba7180 (size 96):\n  comm \"modprobe\", pid 3777, jiffies 4295537735 (age 233.784s)\n  backtrace:\n    kmem_cache_alloc (mm/slub.c:3250 mm/slub.c:3256 mm/slub.c:3263 mm/slub.c:3273)\n    configfs_new_dirent (./include/linux/slab.h:723 fs/configfs/dir.c:194)\n    configfs_make_dirent (fs/configfs/dir.c:248)\n    configfs_create_dir (fs/configfs/dir.c:296)\n    configfs_attach_group.isra.28 (fs/configfs/dir.c:816 fs/configfs/dir.c:852)\n    configfs_register_subsystem (fs/configfs/dir.c:1881)\n    basic_write (drivers/hwtracing/stm/p_basic.c:14) stm_p_basic\n    do_one_initcall (init/main.c:1296)\n    do_init_module (kernel/module/main.c:2455)\n    ...\n\nThis is because the refcount is not correct in configfs_make_dirent().\nFor normal stage, the refcount is changing as:\n\nconfigfs_register_subsystem()\n  configfs_create_dir()\n    configfs_make_dirent()\n      configfs_new_dirent() # set s_count = 1\n      dentry-\u003ed_fsdata = configfs_get(sd); # s_count = 2\n...\nconfigfs_unregister_subsystem()\n  configfs_remove_dir()\n    remove_dir()\n      configfs_remove_dirent() # s_count = 1\n    dput() ...\n      *dentry_unlink_inode()*\n        configfs_d_iput() # s_count = 0, release\n\nHowever, if we failed in configfs_create():\n\nconfigfs_register_subsystem()\n  configfs_create_dir()\n    configfs_make_dirent() # s_count = 2\n    ...\n    configfs_create() # fail\n    -\u003eout_remove:\n    configfs_remove_dirent(dentry)\n      configfs_put(sd) # s_count = 1\n      return PTR_ERR(inode);\n\nThere is no inode in the error path, so the configfs_d_iput() is lost\nand makes sd and fragment memory leaked.\n\nTo fix this, when we failed in configfs_create(), manually call\nconfigfs_put(sd) to keep the refcount correct."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:05:46.159Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/90c38f57a821499391526b15cc944c265bd24e48"
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        {
          "url": "https://git.kernel.org/stable/c/74ac7c9ee2d486c501e7864c903f5098fc477acd"
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        {
          "url": "https://git.kernel.org/stable/c/07f82dca112262b169bec0001378126439cab776"
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          "url": "https://git.kernel.org/stable/c/8bc77754224a2c8581727ffe2e958119b4e27c8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/c72eb6e6e49a71f7598740786568fafdd013a227"
        },
        {
          "url": "https://git.kernel.org/stable/c/c65234b283a65cfbfc94619655e820a5e55199eb"
        }
      ],
      "title": "configfs: fix possible memory leak in configfs_create_dir()",
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        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50751",
    "datePublished": "2025-12-24T13:05:46.159Z",
    "dateReserved": "2025-12-24T13:02:21.544Z",
    "dateUpdated": "2025-12-24T13:05:46.159Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50751\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:01.823\",\"lastModified\":\"2025-12-24T13:16:01.823\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nconfigfs: fix possible memory leak in configfs_create_dir()\\n\\nkmemleak reported memory leaks in configfs_create_dir():\\n\\nunreferenced object 0xffff888009f6af00 (size 192):\\n  comm \\\"modprobe\\\", pid 3777, jiffies 4295537735 (age 233.784s)\\n  backtrace:\\n    kmem_cache_alloc (mm/slub.c:3250 mm/slub.c:3256 mm/slub.c:3263 mm/slub.c:3273)\\n    new_fragment (./include/linux/slab.h:600 fs/configfs/dir.c:163)\\n    configfs_register_subsystem (fs/configfs/dir.c:1857)\\n    basic_write (drivers/hwtracing/stm/p_basic.c:14) stm_p_basic\\n    do_one_initcall (init/main.c:1296)\\n    do_init_module (kernel/module/main.c:2455)\\n    ...\\n\\nunreferenced object 0xffff888003ba7180 (size 96):\\n  comm \\\"modprobe\\\", pid 3777, jiffies 4295537735 (age 233.784s)\\n  backtrace:\\n    kmem_cache_alloc (mm/slub.c:3250 mm/slub.c:3256 mm/slub.c:3263 mm/slub.c:3273)\\n    configfs_new_dirent (./include/linux/slab.h:723 fs/configfs/dir.c:194)\\n    configfs_make_dirent (fs/configfs/dir.c:248)\\n    configfs_create_dir (fs/configfs/dir.c:296)\\n    configfs_attach_group.isra.28 (fs/configfs/dir.c:816 fs/configfs/dir.c:852)\\n    configfs_register_subsystem (fs/configfs/dir.c:1881)\\n    basic_write (drivers/hwtracing/stm/p_basic.c:14) stm_p_basic\\n    do_one_initcall (init/main.c:1296)\\n    do_init_module (kernel/module/main.c:2455)\\n    ...\\n\\nThis is because the refcount is not correct in configfs_make_dirent().\\nFor normal stage, the refcount is changing as:\\n\\nconfigfs_register_subsystem()\\n  configfs_create_dir()\\n    configfs_make_dirent()\\n      configfs_new_dirent() # set s_count = 1\\n      dentry-\u003ed_fsdata = configfs_get(sd); # s_count = 2\\n...\\nconfigfs_unregister_subsystem()\\n  configfs_remove_dir()\\n    remove_dir()\\n      configfs_remove_dirent() # s_count = 1\\n    dput() ...\\n      *dentry_unlink_inode()*\\n        configfs_d_iput() # s_count = 0, release\\n\\nHowever, if we failed in configfs_create():\\n\\nconfigfs_register_subsystem()\\n  configfs_create_dir()\\n    configfs_make_dirent() # s_count = 2\\n    ...\\n    configfs_create() # fail\\n    -\u003eout_remove:\\n    configfs_remove_dirent(dentry)\\n      configfs_put(sd) # s_count = 1\\n      return PTR_ERR(inode);\\n\\nThere is no inode in the error path, so the configfs_d_iput() is lost\\nand makes sd and fragment memory leaked.\\n\\nTo fix this, when we failed in configfs_create(), manually call\\nconfigfs_put(sd) to keep the refcount correct.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07f82dca112262b169bec0001378126439cab776\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74ac7c9ee2d486c501e7864c903f5098fc477acd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8bc77754224a2c8581727ffe2e958119b4e27c8f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/90c38f57a821499391526b15cc944c265bd24e48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c65234b283a65cfbfc94619655e820a5e55199eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c72eb6e6e49a71f7598740786568fafdd013a227\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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