CVE-2022-49879

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49879
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad Patch
https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340 Patch
https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909 Patch
https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327 Patch
https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*
History

10 Nov 2025, 21:20

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad - () https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad - Patch
References () https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340 - () https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340 - Patch
References () https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909 - () https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909 - Patch
References () https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327 - () https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327 - Patch
References () https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d - () https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d - Patch
First Time Linux
Linux linux Kernel
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-617
CPE cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

02 May 2025, 13:52

Type Values Removed Values Added
Summary
  • (es) 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.

01 May 2025, 15:16

Type Values Removed Values Added
New CVE
Information

Published : 2025-05-01 15:16

Updated : 2025-11-10 21:20

NVD link : CVE-2022-49879

Mitre link : CVE-2022-49879

CVE.ORG link : CVE-2022-49879

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-617

Reachable Assertion