CVE-2021-47202

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47202
In the Linux kernel, the following vulnerability has been resolved: thermal: Fix NULL pointer dereferences in of_thermal_ functions of_parse_thermal_zones() parses the thermal-zones node and registers a thermal_zone device for each subnode. However, if a thermal zone is consuming a thermal sensor and that thermal sensor device hasn't probed yet, an attempt to set trip_point_*_temp for that thermal zone device can cause a NULL pointer dereference. Fix it. console:/sys/class/thermal/thermal_zone87 # echo 120000 > trip_point_0_temp ... Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 ... Call trace: of_thermal_set_trip_temp+0x40/0xc4 trip_point_temp_store+0xc0/0x1dc dev_attr_store+0x38/0x88 sysfs_kf_write+0x64/0xc0 kernfs_fop_write_iter+0x108/0x1d0 vfs_write+0x2f4/0x368 ksys_write+0x7c/0xec __arm64_sys_write+0x20/0x30 el0_svc_common.llvm.7279915941325364641+0xbc/0x1bc do_el0_svc+0x28/0xa0 el0_svc+0x14/0x24 el0_sync_handler+0x88/0xec el0_sync+0x1c0/0x200 While at it, fix the possible NULL pointer dereference in other functions as well: of_thermal_get_temp(), of_thermal_set_emul_temp(), of_thermal_get_trend().

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/0750f769b95841b34a9fe8c418dd792ff526bf86 Patch
https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac Patch
https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd Patch
https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 Patch
https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e Patch
https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 Patch
https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac Patch
https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd Patch
https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 Patch
https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e 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:*:*:*:*:*:*:*:*
History

14 Jan 2025, 14:42

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 - () https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 - Patch
References () https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac - () https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac - Patch
References () https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd - () https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd - Patch
References () https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 - () https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 - Patch
References () https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e - () https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e - Patch
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux
CWE CWE-476

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 - () https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 -
References () https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac - () https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac -
References () https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd - () https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd -
References () https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 - () https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 -
References () https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e - () https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: thermal: Fix NULL pointer dereferences in of_thermal_ functions of_parse_thermal_zones() analiza el nodo thermal-zones y registra un dispositivo thermal_zone para cada subnodo. Sin embargo, si una zona térmica está consumiendo un sensor térmico y ese dispositivo de sensor térmico aún no ha realizado la prueba, un intento de establecer trip_point_*_temp para ese dispositivo de zona térmica puede provocar una desreferencia de puntero NULL. Arréglelo. console:/sys/class/thermal/thermal_zone87 # echo 120000 > trip_point_0_temp ... No se puede manejar la desreferencia del puntero NULL del núcleo en la dirección virtual 0000000000000020 ... Seguimiento de llamadas: of_thermal_set_trip_temp+0x40/0xc4 trip_point_temp_store+0xc0/0x1dc dev_attr_store+0x38/0x88 sysfs_kf_write+0x64/0xc0 kernfs_fop_write_iter+0x108/0x1d0 vfs_write+0x2f4/0x368 ksys_write+0x7c/0xec __arm64_sys_write+0x20/0x30 el0_svc_common.llvm.7279915941325364641+0xbc/0x1bc do_el0_svc+0x28/0xa0 el0_svc+0x14/0x24 el0_sync_handler+0x88/0xec el0_sync+0x1c0/0x200 Mientras tanto, corrija también la posible desreferencia del puntero NULL en otras funciones: of_thermal_get_temp(), of_thermal_set_emul_temp(), of_thermal_get_trend().

10 Apr 2024, 19:49

Type Values Removed Values Added
New CVE
Information

Published : 2024-04-10 19:15

Updated : 2025-01-14 14:42

NVD link : CVE-2021-47202

Mitre link : CVE-2021-47202

CVE.ORG link : CVE-2021-47202

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference