FKIE_CVE-2022-49879
Vulnerability from fkie_nvd - Published: 2025-05-01 15:16 - Updated: 2026-06-17 05:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix BUG_ON() when directory entry has invalid rec_len
The rec_len field in the directory entry has to be a multiple of 4. A
corrupted filesystem image can be used to hit a BUG() in
ext4_rec_len_to_disk(), called from make_indexed_dir().
------------[ cut here ]------------
kernel BUG at fs/ext4/ext4.h:2413!
...
RIP: 0010:make_indexed_dir+0x53f/0x5f0
...
Call Trace:
<TASK>
? add_dirent_to_buf+0x1b2/0x200
ext4_add_entry+0x36e/0x480
ext4_add_nondir+0x2b/0xc0
ext4_create+0x163/0x200
path_openat+0x635/0xe90
do_filp_open+0xb4/0x160
? __create_object.isra.0+0x1de/0x3b0
? _raw_spin_unlock+0x12/0x30
do_sys_openat2+0x91/0x150
__x64_sys_open+0x6c/0xa0
do_syscall_64+0x3c/0x80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
The fix simply adds a call to ext4_check_dir_entry() to validate the
directory entry, returning -EFSCORRUPTED if the entry is invalid.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 6.1 | |
| linux | linux_kernel | 6.1 | |
| linux | linux_kernel | 6.1 |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/ext4/namei.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "2fa24d0274fbf913b56ee31f15bc01168669d909",
"status": "affected",
"version": "3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4",
"versionType": "git"
},
{
"lessThan": "156451a67b93986fb07c274ef6995ff40766c5ad",
"status": "affected",
"version": "3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4",
"versionType": "git"
},
{
"lessThan": "999cff2b6ce3b45c08abf793bf55534777421327",
"status": "affected",
"version": "3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4",
"versionType": "git"
},
{
"lessThan": "ce1ee2c8827fb6493e91acbd50f664cf2a972c3d",
"status": "affected",
"version": "3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4",
"versionType": "git"
},
{
"lessThan": "17a0bc9bd697f75cfdf9b378d5eb2d7409c91340",
"status": "affected",
"version": "3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/ext4/namei.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.30"
},
{
"lessThan": "2.6.30",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.224",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.154",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.78",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.0.*",
"status": "unaffected",
"version": "6.0.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "1A06F3FB-68BF-4D02-8B97-06AB86DC13A7",
"versionEndExcluding": "5.4.224",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "475D097C-AB5A-4CF5-899F-413077854ABD",
"versionEndExcluding": "5.10.154",
"versionStartIncluding": "5.5",
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{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"matchCriteriaId": "EC9A754E-625D-42F3-87A7-960D643E2867",
"versionEndExcluding": "6.0.8",
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{
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],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix BUG_ON() when directory entry has invalid rec_len\n\nThe rec_len field in the directory entry has to be a multiple of 4. A\ncorrupted filesystem image can be used to hit a BUG() in\next4_rec_len_to_disk(), called from make_indexed_dir().\n\n ------------[ cut here ]------------\n kernel BUG at fs/ext4/ext4.h:2413!\n ...\n RIP: 0010:make_indexed_dir+0x53f/0x5f0\n ...\n Call Trace:\n \u003cTASK\u003e\n ? add_dirent_to_buf+0x1b2/0x200\n ext4_add_entry+0x36e/0x480\n ext4_add_nondir+0x2b/0xc0\n ext4_create+0x163/0x200\n path_openat+0x635/0xe90\n do_filp_open+0xb4/0x160\n ? __create_object.isra.0+0x1de/0x3b0\n ? _raw_spin_unlock+0x12/0x30\n do_sys_openat2+0x91/0x150\n __x64_sys_open+0x6c/0xa0\n do_syscall_64+0x3c/0x80\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThe fix simply adds a call to ext4_check_dir_entry() to validate the\ndirectory entry, returning -EFSCORRUPTED if the entry is invalid."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: correcci\u00f3n de BUG_ON() cuando la entrada de directorio tiene un rec_len no v\u00e1lido El campo rec_len en la entrada de directorio debe ser un m\u00faltiplo de 4. Una imagen de sistema de archivos da\u00f1ada se puede usar para generar un BUG() en ext4_rec_len_to_disk(), llamado desde make_indexed_dir(). ------------[ cortar aqu\u00ed ]------------ \u00a1ERROR del kernel en fs/ext4/ext4.h:2413! ... RIP: 0010:make_indexed_dir+0x53f/0x5f0 ... Rastreo de llamadas: ? add_dirent_to_buf+0x1b2/0x200 ext4_add_entry+0x36e/0x480 ext4_add_nondir+0x2b/0xc0 ext4_create+0x163/0x200 path_openat+0x635/0xe90 do_filp_open+0xb4/0x160 ? __create_object.isra.0+0x1de/0x3b0 ? _raw_spin_unlock+0x12/0x30 do_sys_openat2+0x91/0x150 __x64_sys_open+0x6c/0xa0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 La soluci\u00f3n simplemente agrega una llamada a ext4_check_dir_entry() para validar la entrada del directorio, devolviendo -EFSCORRUPTED si la entrada no es v\u00e1lida."
}
],
"id": "CVE-2022-49879",
"lastModified": "2026-06-17T05:19:24.190",
"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": "2025-05-01T15:16:12.857",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-617"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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