{"id":"CVE-2021-47384","state":"PUBLISHED","title":"hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field\n\nIf driver read tmp value sufficient for\n(tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 4) & 0x7))\nfrom device then Null pointer dereference occurs.\n(It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers)\nAlso lm75[] does not serve a purpose anymore after switching to\ndevm_i2c_new_dummy_device() in w83791d_detect_subclients().\n\nThe patch fixes possible NULL pointer dereference by removing lm75[].\n\nFound by Linux Driver Verification project (linuxtesting.org).\n\n[groeck: Dropped unnecessary continuation lines, fixed multi-line alignments]","publishedAt":"2024-05-21T15:03:44.955Z","updatedAt":"2026-05-11T13:53:39.015Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cf48d17623281c2b3185030ed23f148bd47e15de","status":"affected","lessThan":"6cb01fe630eaffc5a2c3f7364436caddba286623","versionType":"git"},{"version":"cf48d17623281c2b3185030ed23f148bd47e15de","status":"affected","lessThan":"7c4fd5de39f273626a2b0f3a446d2cc85cd47616","versionType":"git"},{"version":"cf48d17623281c2b3185030ed23f148bd47e15de","status":"affected","lessThan":"746011193f44f97f8784edcf8327c587946745fc","versionType":"git"},{"version":"cf48d17623281c2b3185030ed23f148bd47e15de","status":"affected","lessThan":"dd4d747ef05addab887dc8ff0d6ab9860bbcd783","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/w83793.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.4.151","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.71","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.10","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/w83793.c"]}],"references":["https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623","https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616","https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc","https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47384.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47384","state":"PUBLISHED","datePublished":"2024-05-21T15:03:44.955Z","dateUpdated":"2026-05-11T13:53:39.015Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T14:58:30.812Z"},"containers":{"cna":{"title":"hwmon: 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