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CVE-2022-50751 (GCVE-0-2022-50751)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2026-05-11 19:24
VLAI
Title
configfs: fix possible memory leak in configfs_create_dir()
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7063fbf2261194f72ee75afca67b3b38b554b5fa , < 90c38f57a821499391526b15cc944c265bd24e48 (git)
Affected: 7063fbf2261194f72ee75afca67b3b38b554b5fa , < 74ac7c9ee2d486c501e7864c903f5098fc477acd (git)
Affected: 7063fbf2261194f72ee75afca67b3b38b554b5fa , < 07f82dca112262b169bec0001378126439cab776 (git)
Affected: 7063fbf2261194f72ee75afca67b3b38b554b5fa , < 8bc77754224a2c8581727ffe2e958119b4e27c8f (git)
Affected: 7063fbf2261194f72ee75afca67b3b38b554b5fa , < c72eb6e6e49a71f7598740786568fafdd013a227 (git)
Affected: 7063fbf2261194f72ee75afca67b3b38b554b5fa , < c65234b283a65cfbfc94619655e820a5e55199eb (git)
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Linux Linux Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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          "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."
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        "dateUpdated": "2026-05-11T19:24:49.023Z",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50751",
    "datePublished": "2025-12-24T13:05:46.159Z",
    "dateReserved": "2025-12-24T13:02:21.544Z",
    "dateUpdated": "2026-05-11T19:24:49.023Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2022-50751",
      "date": "2026-09-17",
      "epss": "0.00245",
      "percentile": "0.16003"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50751\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:01.823\",\"lastModified\":\"2026-06-17T05:24:06.943\",\"vulnStatus\":\"Deferred\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/configfs/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7063fbf2261194f72ee75afca67b3b38b554b5fa\",\"lessThan\":\"90c38f57a821499391526b15cc944c265bd24e48\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7063fbf2261194f72ee75afca67b3b38b554b5fa\",\"lessThan\":\"74ac7c9ee2d486c501e7864c903f5098fc477acd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7063fbf2261194f72ee75afca67b3b38b554b5fa\",\"lessThan\":\"07f82dca112262b169bec0001378126439cab776\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7063fbf2261194f72ee75afca67b3b38b554b5fa\",\"lessThan\":\"8bc77754224a2c8581727ffe2e958119b4e27c8f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7063fbf2261194f72ee75afca67b3b38b554b5fa\",\"lessThan\":\"c72eb6e6e49a71f7598740786568fafdd013a227\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7063fbf2261194f72ee75afca67b3b38b554b5fa\",\"lessThan\":\"c65234b283a65cfbfc94619655e820a5e55199eb\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/configfs/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.229\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.163\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.86\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.16\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.2\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:33:06+00:00",
      "cve": "CVE-2022-50751",
      "id": "CVE-2022-50751",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (configfs): Denial of Service due to memory leak via incorrect reference counting",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50751.json",
      "version": "3"
    }
  }
}



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