CVE-2021-47202
Linux Kernel Thermal Zone Null Pointer Dereference
Description
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().
INFO
Published Date :
April 10, 2024, 7:15 p.m.
Last Modified :
Jan. 14, 2025, 2:42 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2021-47202.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2021-47202 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47202 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Jan. 14, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NIST CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.4.210 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.81 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.14.21 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.15 up to (excluding) 5.15.4 Changed Reference Type https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 No Types Assigned https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 Patch Changed Reference Type https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 No Types Assigned https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 Patch Changed Reference Type https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac No Types Assigned https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac Patch Changed Reference Type https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac No Types Assigned https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac Patch Changed Reference Type https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd No Types Assigned https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd Patch Changed Reference Type https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd No Types Assigned https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd Patch Changed Reference Type https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 No Types Assigned https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 Patch Changed Reference Type https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 No Types Assigned https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 Patch Changed Reference Type https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e No Types Assigned https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e Patch Changed Reference Type https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e No Types Assigned https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 Added Reference https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac Added Reference https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd Added Reference https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 Added Reference https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 10, 2024
Action Type Old Value New Value Added Description 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(). Added Reference kernel.org https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47202 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47202
weaknesses.