CVE-2022-50751
Estado: AplazadaSin puntuar—
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():
This is because the refcount is not correct in configfs_make_dirent(). For normal stage, the refcount is changing as:
However, if we failed in configfs_create():
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.
Detalles técnicos trazas, registros y código del informe original
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)
...
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
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);CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.25%
- Percentil entre todas las CVEs puntuadas: 15
- Fecha de la puntuación: 4/10/2026
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)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/07f82dca112262b169bec0001378126439cab776
- https://git.kernel.org/stable/c/74ac7c9ee2d486c501e7864c903f5098fc477acd
- https://git.kernel.org/stable/c/8bc77754224a2c8581727ffe2e958119b4e27c8f
- https://git.kernel.org/stable/c/90c38f57a821499391526b15cc944c265bd24e48
- https://git.kernel.org/stable/c/c65234b283a65cfbfc94619655e820a5e55199eb
- https://git.kernel.org/stable/c/c72eb6e6e49a71f7598740786568fafdd013a227
JSON original (NVD)
Mostrar
{
"id": "CVE-2022-50751",
"cveTags": [],
"metrics": {},
"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": "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"
}
],
"programFiles": [
"fs/configfs/dir.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.229",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.163",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.86",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.0.16",
"versionType": "semver",
"lessThanOrEqual": "6.0.*"
},
{
"status": "unaffected",
"version": "6.1.2",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/configfs/dir.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-24T13:16:01.823",
"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"
}
],
"vulnStatus": "Deferred",
"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->d_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 ->out_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."
}
],
"lastModified": "2026-06-17T05:24:06.943",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}