{"id":"CVE-2021-47202","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-47202","generatedAt":"2026-10-27T21:47:10.805Z","title":"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.","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nthermal: Fix NULL pointer dereferences in of_thermal_ functions\n\nof_parse_thermal_zones() parses the thermal-zones node and registers a\nthermal_zone device for each subnode. However, if a thermal zone is\nconsuming a thermal sensor and that thermal sensor device hasn't probed\nyet, an attempt to set trip_point_*_temp for that thermal zone device\ncan cause a NULL pointer dereference. Fix it.\n\n console:/sys/class/thermal/thermal_zone87 # echo 120000 > trip_point_0_temp\n ...\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020\n ...\n Call trace:\n  of_thermal_set_trip_temp+0x40/0xc4\n  trip_point_temp_store+0xc0/0x1dc\n  dev_attr_store+0x38/0x88\n  sysfs_kf_write+0x64/0xc0\n  kernfs_fop_write_iter+0x108/0x1d0\n  vfs_write+0x2f4/0x368\n  ksys_write+0x7c/0xec\n  __arm64_sys_write+0x20/0x30\n  el0_svc_common.llvm.7279915941325364641+0xbc/0x1bc\n  do_el0_svc+0x28/0xa0\n  el0_svc+0x14/0x24\n  el0_sync_handler+0x88/0xec\n  el0_sync+0x1c0/0x200\n\nWhile at it, fix the possible NULL pointer dereference in other\nfunctions as well: of_thermal_get_temp(), of_thermal_set_emul_temp(),\nof_thermal_get_trend().","published":"2024-04-10T19:15:48.000Z","lastModified":"2026-06-17T04:16:54.000Z","status":"Analyzed","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-476"],"affected":["linux/linux kernel"],"epss":{"score":0.00237,"percentile":0.14628,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-47202","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}