{"id":"CVE-2021-47202","state":"PUBLISHED","title":"thermal: Fix NULL pointer dereferences in of_thermal_ functions","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().","publishedAt":"2024-04-10T18:56:36.408Z","updatedAt":"2026-05-11T13:49:57.314Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"828f4c31684da94ecf0b44a2cbd35bbede04f0bd","versionType":"git"},{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"6a315471cb6a07f651e1d3adc8962730f4fcccac","versionType":"git"},{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"0750f769b95841b34a9fe8c418dd792ff526bf86","versionType":"git"},{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"ef2590a5305e0b8e9342f84c2214aa478ee7f28e","versionType":"git"},{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"96cfe05051fd8543cdedd6807ec59a0e6c409195","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thermal/thermal_of.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.4.210","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.81","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.21","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15.4","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thermal/thermal_of.c"]}],"references":["https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd","https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac","https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86","https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e","https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47202.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47202","state":"PUBLISHED","datePublished":"2024-04-10T18:56:36.408Z","dateUpdated":"2026-05-11T13:49:57.314Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-03-25T09:12:14.117Z"},"containers":{"cna":{"title":"thermal: Fix NULL pointer dereferences in of_thermal_ functions","descriptions":[{"lang":"en","value":"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()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"828f4c31684da94ecf0b44a2cbd35bbede04f0bd","versionType":"git"},{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"6a315471cb6a07f651e1d3adc8962730f4fcccac","versionType":"git"},{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"0750f769b95841b34a9fe8c418dd792ff526bf86","versionType":"git"},{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"ef2590a5305e0b8e9342f84c2214aa478ee7f28e","versionType":"git"},{"version":"2251aef64a38db60f4ae7a4a83f9203c6791f196","status":"affected","lessThan":"96cfe05051fd8543cdedd6807ec59a0e6c409195","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thermal/thermal_of.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.4.210","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.81","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.21","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15.4","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thermal/thermal_of.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd"},{"url":"https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac"},{"url":"https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86"},{"url":"https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e"},{"url":"https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:49:57.314Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.4.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.10.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.14.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.15.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE 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