{"id":"CVE-2026-74546","state":"PUBLISHED","title":"hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read\n\nIf the fan data becomes 0 between the FAN_DATA_VALID() check and the\nFAN_PERIOD_TO_RPM() conversion, it will result in a divide-by-zero crash\ndue to a race with a concurrent update of the cached fan value.\n\nFix a TOCTOU issue by reading fan data once.","publishedAt":"2026-08-15T12:27:55.147Z","updatedAt":"2026-08-19T16:38:34.886Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"689a2ea75434131d0af58aeb7d51fde40e858b4d","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"009240d057e26831cc925feaba4c490209c1d0ba","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"d328175045176f85c15c369bd21dc551351e7935","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"832069bec79cf6f903441c5769d3cdba95d0af33","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"96ad57d31763559d376416cdf3bf5ae79bbbebec","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"76963b04b2d1c648d69949d8dd521e1ff7f40b51","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"1b46fe9dc8f8de59310f37e6c5e5c0e05ded46c3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/adt7470.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/adt7470.c"]}],"references":["https://git.kernel.org/stable/c/689a2ea75434131d0af58aeb7d51fde40e858b4d","https://git.kernel.org/stable/c/009240d057e26831cc925feaba4c490209c1d0ba","https://git.kernel.org/stable/c/d328175045176f85c15c369bd21dc551351e7935","https://git.kernel.org/stable/c/832069bec79cf6f903441c5769d3cdba95d0af33","https://git.kernel.org/stable/c/96ad57d31763559d376416cdf3bf5ae79bbbebec","https://git.kernel.org/stable/c/76963b04b2d1c648d69949d8dd521e1ff7f40b51","https://git.kernel.org/stable/c/1b46fe9dc8f8de59310f37e6c5e5c0e05ded46c3"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74546.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74546","state":"PUBLISHED","datePublished":"2026-08-15T12:27:55.147Z","dateUpdated":"2026-08-19T16:38:34.886Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.914Z"},"containers":{"cna":{"title":"hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read\n\nIf the fan data becomes 0 between the FAN_DATA_VALID() check and the\nFAN_PERIOD_TO_RPM() conversion, it will result in a divide-by-zero crash\ndue to a race with a concurrent update of the cached fan value.\n\nFix a TOCTOU issue by reading fan data once."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"689a2ea75434131d0af58aeb7d51fde40e858b4d","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"009240d057e26831cc925feaba4c490209c1d0ba","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"d328175045176f85c15c369bd21dc551351e7935","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"832069bec79cf6f903441c5769d3cdba95d0af33","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"96ad57d31763559d376416cdf3bf5ae79bbbebec","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"76963b04b2d1c648d69949d8dd521e1ff7f40b51","versionType":"git"},{"version":"fc958a61ff6d34a0ec42744d3ff524ee202b2e9f","status":"affected","lessThan":"1b46fe9dc8f8de59310f37e6c5e5c0e05ded46c3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/adt7470.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/adt7470.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/689a2ea75434131d0af58aeb7d51fde40e858b4d"},{"url":"https://git.kernel.org/stable/c/009240d057e26831cc925feaba4c490209c1d0ba"},{"url":"https://git.kernel.org/stable/c/d328175045176f85c15c369bd21dc551351e7935"},{"url":"https://git.kernel.org/stable/c/832069bec79cf6f903441c5769d3cdba95d0af33"},{"url":"https://git.kernel.org/stable/c/96ad57d31763559d376416cdf3bf5ae79bbbebec"},{"url":"https://git.kernel.org/stable/c/76963b04b2d1c648d69949d8dd521e1ff7f40b51"},{"url":"https://git.kernel.org/stable/c/1b46fe9dc8f8de59310f37e6c5e5c0e05ded46c3"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:38:34.886Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}