{"api_version":"1","generated_at":"2026-08-16T17:36:22+00:00","cve":"CVE-2026-74549","urls":{"html":"https://cve.report/CVE-2026-74549","api":"https://cve.report/api/cve/CVE-2026-74549.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74549","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74549"},"summary":{"title":"hwmon: (nct6775-core) Prevent access to unsupported weight registers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (nct6775-core) Prevent access to unsupported weight registers\n\nSashiko reports:\n\nDuring initialization of the nct6116 chip, the driver sets data->pwm_num\nto 5. However, it assigns several NCT6106 register arrays (such as\nNCT6106_REG_WEIGHT_DUTY_STEP, NCT6106_REG_WEIGHT_TEMP_SEL, and\nNCT6106_REG_WEIGHT_TEMP_*) to data->REG_PWM and data->REG_WEIGHT_TEMP.\nThese arrays only contain 3 elements.\n\nIn nct6775_update_pwm(), the driver iterates up to data->pwm_num. If\ndata->has_pwm has bits 3 or 4 set (which is structurally possible for\nnct6116), the loop attempts to read elements at index 3 and 4 from these\n3-element arrays. This results in a global out-of-bounds read, which can\nbe caught by KASAN.\n\nFurthermore, the driver uses these garbage out-of-bounds values as\nhardware register addresses for subsequent read and write operations. This\nleads to invalid hardware register access, potentially causing hardware\nmisconfiguration or system crashes.\n\nThe underlying problem is that the chip does support up to five fan\ncontrol channels, but only the first three support weight control.\nFix the problem by extending the affected weight register arrays with\nzeroed fields. The driver uses zeroed register addresses to determine\nif a register is supported or not, and skips accesses for unsupported\nregisters.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:18:00","updated_at":"2026-08-15 13:18:00"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/25b528816f5d83be5236dc182692369e8c9402b0","name":"https://git.kernel.org/stable/c/25b528816f5d83be5236dc182692369e8c9402b0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4ad2972ef0e1bd1018ad7a72661a4636ed7daecc","name":"https://git.kernel.org/stable/c/4ad2972ef0e1bd1018ad7a72661a4636ed7daecc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d0b704e569ac3b8416d8e02270cdc9bf830ed395","name":"https://git.kernel.org/stable/c/d0b704e569ac3b8416d8e02270cdc9bf830ed395","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/689082a4cb166a7ae9729f7b12339e69fdad6c52","name":"https://git.kernel.org/stable/c/689082a4cb166a7ae9729f7b12339e69fdad6c52","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1b722740ac5c2b2070f9ba922f4e0f227faf0246","name":"https://git.kernel.org/stable/c/1b722740ac5c2b2070f9ba922f4e0f227faf0246","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74549","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74549","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c7cb485b321c024dedc168bcbb04451176b163 25b528816f5d83be5236dc182692369e8c9402b0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c7cb485b321c024dedc168bcbb04451176b163 689082a4cb166a7ae9729f7b12339e69fdad6c52 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c7cb485b321c024dedc168bcbb04451176b163 1b722740ac5c2b2070f9ba922f4e0f227faf0246 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c7cb485b321c024dedc168bcbb04451176b163 4ad2972ef0e1bd1018ad7a72661a4636ed7daecc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c7cb485b321c024dedc168bcbb04451176b163 d0b704e569ac3b8416d8e02270cdc9bf830ed395 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.151 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc6 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/hwmon/nct6775-core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"25b528816f5d83be5236dc182692369e8c9402b0","status":"affected","version":"29c7cb485b321c024dedc168bcbb04451176b163","versionType":"git"},{"lessThan":"689082a4cb166a7ae9729f7b12339e69fdad6c52","status":"affected","version":"29c7cb485b321c024dedc168bcbb04451176b163","versionType":"git"},{"lessThan":"1b722740ac5c2b2070f9ba922f4e0f227faf0246","status":"affected","version":"29c7cb485b321c024dedc168bcbb04451176b163","versionType":"git"},{"lessThan":"4ad2972ef0e1bd1018ad7a72661a4636ed7daecc","status":"affected","version":"29c7cb485b321c024dedc168bcbb04451176b163","versionType":"git"},{"lessThan":"d0b704e569ac3b8416d8e02270cdc9bf830ed395","status":"affected","version":"29c7cb485b321c024dedc168bcbb04451176b163","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/hwmon/nct6775-core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.4"},{"lessThan":"5.4","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.151","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc6","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.151","versionStartIncluding":"5.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"5.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"5.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"5.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc6","versionStartIncluding":"5.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (nct6775-core) Prevent access to unsupported weight registers\n\nSashiko reports:\n\nDuring initialization of the nct6116 chip, the driver sets data->pwm_num\nto 5. However, it assigns several NCT6106 register arrays (such as\nNCT6106_REG_WEIGHT_DUTY_STEP, NCT6106_REG_WEIGHT_TEMP_SEL, and\nNCT6106_REG_WEIGHT_TEMP_*) to data->REG_PWM and data->REG_WEIGHT_TEMP.\nThese arrays only contain 3 elements.\n\nIn nct6775_update_pwm(), the driver iterates up to data->pwm_num. If\ndata->has_pwm has bits 3 or 4 set (which is structurally possible for\nnct6116), the loop attempts to read elements at index 3 and 4 from these\n3-element arrays. This results in a global out-of-bounds read, which can\nbe caught by KASAN.\n\nFurthermore, the driver uses these garbage out-of-bounds values as\nhardware register addresses for subsequent read and write operations. This\nleads to invalid hardware register access, potentially causing hardware\nmisconfiguration or system crashes.\n\nThe underlying problem is that the chip does support up to five fan\ncontrol channels, but only the first three support weight control.\nFix the problem by extending the affected weight register arrays with\nzeroed fields. The driver uses zeroed register addresses to determine\nif a register is supported or not, and skips accesses for unsupported\nregisters."}],"providerMetadata":{"dateUpdated":"2026-08-15T12:27:56.993Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/25b528816f5d83be5236dc182692369e8c9402b0"},{"url":"https://git.kernel.org/stable/c/689082a4cb166a7ae9729f7b12339e69fdad6c52"},{"url":"https://git.kernel.org/stable/c/1b722740ac5c2b2070f9ba922f4e0f227faf0246"},{"url":"https://git.kernel.org/stable/c/4ad2972ef0e1bd1018ad7a72661a4636ed7daecc"},{"url":"https://git.kernel.org/stable/c/d0b704e569ac3b8416d8e02270cdc9bf830ed395"}],"title":"hwmon: (nct6775-core) Prevent access to unsupported weight registers","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74549","datePublished":"2026-08-15T12:27:56.993Z","dateReserved":"2026-08-15T05:44:03.915Z","dateUpdated":"2026-08-15T12:27:56.993Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:18:00","lastModifiedDate":"2026-08-15 13:18:00","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74549","Ordinal":"1","Title":"hwmon: (nct6775-core) Prevent access to unsupported weight regis","CVE":"CVE-2026-74549","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74549","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (nct6775-core) Prevent access to unsupported weight registers\n\nSashiko reports:\n\nDuring initialization of the nct6116 chip, the driver sets data->pwm_num\nto 5. However, it assigns several NCT6106 register arrays (such as\nNCT6106_REG_WEIGHT_DUTY_STEP, NCT6106_REG_WEIGHT_TEMP_SEL, and\nNCT6106_REG_WEIGHT_TEMP_*) to data->REG_PWM and data->REG_WEIGHT_TEMP.\nThese arrays only contain 3 elements.\n\nIn nct6775_update_pwm(), the driver iterates up to data->pwm_num. If\ndata->has_pwm has bits 3 or 4 set (which is structurally possible for\nnct6116), the loop attempts to read elements at index 3 and 4 from these\n3-element arrays. This results in a global out-of-bounds read, which can\nbe caught by KASAN.\n\nFurthermore, the driver uses these garbage out-of-bounds values as\nhardware register addresses for subsequent read and write operations. This\nleads to invalid hardware register access, potentially causing hardware\nmisconfiguration or system crashes.\n\nThe underlying problem is that the chip does support up to five fan\ncontrol channels, but only the first three support weight control.\nFix the problem by extending the affected weight register arrays with\nzeroed fields. The driver uses zeroed register addresses to determine\nif a register is supported or not, and skips accesses for unsupported\nregisters.","Type":"Description","Title":"hwmon: (nct6775-core) Prevent access to unsupported weight regis"}]}}}