CVE-2022-49879
Full vulnerability record from the local CVENow database.
Description
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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-05-01 15:16:12.857000
Last modified
2026-11-05 20:17:16.900000
View original CVE JSON
{
"id": "CVE-2022-49879",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-05-01T15:16:12.857",
"lastModified": "2026-11-05T20:17:16.900",
"vulnStatus": "Analyzed",
"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 <TASK>\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: corrección de BUG_ON() cuando la entrada de directorio tiene un rec_len no válido El campo rec_len en la entrada de directorio debe ser un múltiplo de 4. Una imagen de sistema de archivos dañada se puede usar para generar un BUG() en ext4_rec_len_to_disk(), llamado desde make_indexed_dir(). ------------[ cortar aquí ]------------ ¡ERROR 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 solución simplemente agrega una llamada a ext4_check_dir_entry() para validar la entrada del directorio, devolviendo -EFSCORRUPTED si la entrada no es válida."
}
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"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
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