CVE-2021-4439

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-4439
In the Linux kernel, the following vulnerability has been resolved: isdn: cpai: check ctr->cnr to avoid array index out of bound The cmtp_add_connection() would add a cmtp session to a controller and run a kernel thread to process cmtp. __module_get(THIS_MODULE); session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d", session->num); During this process, the kernel thread would call detach_capi_ctr() to detach a register controller. if the controller was not attached yet, detach_capi_ctr() would trigger an array-index-out-bounds bug. [ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in drivers/isdn/capi/kcapi.c:483:21 [ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]' [ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted 5.15.0-rc2+ #8 [ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 [ 46.870107][ T6479] Call Trace: [ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d [ 46.870974][ T6479] ubsan_epilogue+0x5/0x40 [ 46.871458][ T6479] __ubsan_handle_out_of_bounds.cold+0x43/0x48 [ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0 [ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0 [ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60 [ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120 [ 46.874256][ T6479] kthread+0x147/0x170 [ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40 [ 46.875248][ T6479] ret_from_fork+0x1f/0x30 [ 46.875773][ T6479]

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d Patch
https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a Patch
https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54 Patch
https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a Patch
https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594 Patch
https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75 Patch
https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff Patch
https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
History

18 Sep 2024, 16:34

Type Values Removed Values Added
CWE CWE-129
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
CPE cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d - () https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d - Patch
References () https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a - () https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a - Patch
References () https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54 - () https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54 - Patch
References () https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a - () https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a - Patch
References () https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594 - () https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594 - Patch
References () https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75 - () https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75 - Patch
References () https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff - () https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff - Patch
References () https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036 - () https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036 - Patch
First Time Linux linux Kernel
Linux
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: isdn: cpai: verifique ctr->cnr para evitar que el índice de matriz esté fuera de límite. cmtp_add_connection() agregaría una sesión cmtp a un controlador y ejecutaría un subproceso del kernel para procesar cmtp. __module_get(ESTE_MÓDULO); sesión->tarea = kthread_run(cmtp_session, sesión, "kcmtpd_ctr_%d", sesión->num); Durante este proceso, el hilo del núcleo llamaría a detach_capi_ctr() para desconectar un controlador de registro. Si el controlador aún no estaba conectado, detach_capi_ctr() desencadenaría un error de los límites de índice de matriz. [ 46.866069][ T6479] UBSAN: índice de matriz fuera de los límites en drivers/isdn/capi/kcapi.c:483:21 [ 46.867196][ T6479] el índice -1 está fuera de rango para el tipo 'capi_ctr *[ 32]' [ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 No contaminado 5.15.0-rc2+ #8 [ 46.869002][ T6479] Nombre de hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS 1.14. 0-2 01/04/2014 [ 46.870107][ T6479] Seguimiento de llamadas: [ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d [ 46.870974][ T6479] ubsan_epilogue+0x5/0x40 [ 46.871458][ T6479 ] __ubsan_handle_out_of_bounds.cold+0x43 /0x48 [ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0 [ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0 [ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60 [ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120 [ 46.874256][ T6479] kthread+0x147/0x170 [ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40 [ 46.875248][ T6479] ret_from_fork+0x1f/0x30 [ 46.875773][ T6479]

20 Jun 2024, 12:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-06-20 12:15

Updated : 2024-09-18 16:34

NVD link : CVE-2021-4439

Mitre link : CVE-2021-4439

CVE.ORG link : CVE-2021-4439

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-129

Improper Validation of Array Index