CVE-2024-36966

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-36966
In the Linux kernel, the following vulnerability has been resolved: erofs: reliably distinguish block based and fscache mode When erofs_kill_sb() is called in block dev based mode, s_bdev may not have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled, it will be mistaken for fscache mode, and then attempt to free an anon_dev that has never been allocated, triggering the following warning: ============================================ ida_free called for id=0 which is not allocated. WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140 Modules linked in: CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630 RIP: 0010:ida_free+0x134/0x140 Call Trace: <TASK> erofs_kill_sb+0x81/0x90 deactivate_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ============================================ Now when erofs_kill_sb() is called, erofs_sb_info must have been initialised, so use sbi->fsid to distinguish between the two modes.

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/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 Patch
https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe Patch
https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371 Patch
https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 Patch
https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe Patch
https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371 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:6.9:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc6:*:*:*:*:*:*
History

01 Oct 2025, 14:43

Type Values Removed Values Added
CWE CWE-824
CPE cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.9:rc5:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 - () https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 - Patch
References () https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe - () https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe - Patch
References () https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371 - () https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux

21 Nov 2024, 09:22

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 - () https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 -
References () https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe - () https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe -
References () https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371 - () https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: erofs: distingue de manera confiable el modo basado en bloques y el modo fscache cuando se llama a erofs_kill_sb() en el modo basado en desarrollo de bloques, es posible que s_bdev aún no se haya inicializado y, si CONFIG_EROFS_FS_ONDEMAND está habilitado, se confundido con el modo fscache y luego intenta liberar un anon_dev que nunca ha sido asignado, lo que genera la siguiente advertencia: ============================= ================= ida_free solicitó id=0 que no está asignado. ADVERTENCIA: CPU: 14 PID: 926 en lib/idr.c:525 ida_free+0x134/0x140 Módulos vinculados en: CPU: 14 PID: 926 Comm: mount No contaminado 6.9.0-rc3-dirty #630 RIP: 0010:ida_free +0x134/0x140 Seguimiento de llamadas: erofs_kill_sb+0x81/0x90 desactivar_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ========== ================================== Ahora, cuando se llama a erofs_kill_sb(), erofs_sb_info debe haberse inicializado, así que use sbi-&gt;fsid para distinguir entre los dos modos.

08 Jun 2024, 13:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-06-08 13:15

Updated : 2025-10-01 14:43

NVD link : CVE-2024-36966

Mitre link : CVE-2024-36966

CVE.ORG link : CVE-2024-36966

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-824

Access of Uninitialized Pointer