CVE-2026-74549hwmon: (nct6775-core) Prevent access to unsupported weight registers
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: hwmon: (nct6775-core) Prevent access to unsupported weight registers Sashiko reports: During initialization of the nct6116 chip, the driver sets data->pwm_num to 5. However, it assigns several NCT6106 register arrays (such as NCT6106_REG_WEIGHT_DUTY_STEP, NCT6106_REG_WEIGHT_TEMP_SEL, and NCT6106_REG_WEIGHT_TEMP_*) to data->REG_PWM and data->REG_WEIGHT_TEMP. These arrays only contain 3 elements. In nct6775_update_pwm(), the driver iterates up to data->pwm_num. If data->has_pwm has bits 3 or 4 set (which is structurally possible for nct6116), the loop attempts to read elements at index 3 and 4 from these 3-element arrays. This results in a global out-of-bounds read, which can be caught by KASAN. Furthermore, the driver uses these garbage out-of-bounds values as hardware register addresses for subsequent read and write operations. This leads to invalid hardware register access, potentially causing hardware misconfiguration or system crashes. The underlying problem is that the chip does support up to five fan control channels, but only the first three support weight control. Fix the problem by extending the affected weight register arrays with zeroed fields. The driver uses zeroed register addresses to determine if a register is supported or not, and skips accesses for unsupported registers.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 29c7cb485b321c024dedc168bcbb04451176b163 builds before 0d11b2a10269ace29832f584d207ff3768f79dc5; 29c7cb485b321c024dedc168bcbb04451176b163 builds before 4a77f1d72c6db04cbbfab0250292ac71fdea5f0a; from 29c7cb485b321c024dedc168bcbb04451176b163 before 513d847f7a95bbdbeaaf55fb942c38992587734f; 29c7cb485b321c024dedc168bcbb04451176b163 builds before 25b528816f5d83be5236dc182692369e8c9402b0; from 29c7cb485b321c024dedc168bcbb04451176b163 before 689082a4cb166a7ae9729f7b12339e69fdad6c52; 29c7cb485b321c024dedc168bcbb04451176b163 builds before 1b722740ac5c2b2070f9ba922f4e0f227faf0246; 29c7cb485b321c024dedc168bcbb04451176b163 builds before 4ad2972ef0e1bd1018ad7a72661a4636ed7daecc; from 29c7cb485b321c024dedc168bcbb04451176b163 before d0b704e569ac3b8416d8e02270cdc9bf830ed395 | CNA record |
References
- https://git.kernel.org/stable/c/0d11b2a10269ace29832f584d207ff3768f79dc5
- https://git.kernel.org/stable/c/4a77f1d72c6db04cbbfab0250292ac71fdea5f0a
- https://git.kernel.org/stable/c/513d847f7a95bbdbeaaf55fb942c38992587734f
- https://git.kernel.org/stable/c/25b528816f5d83be5236dc182692369e8c9402b0
- https://git.kernel.org/stable/c/689082a4cb166a7ae9729f7b12339e69fdad6c52
- https://git.kernel.org/stable/c/1b722740ac5c2b2070f9ba922f4e0f227faf0246
- https://git.kernel.org/stable/c/4ad2972ef0e1bd1018ad7a72661a4636ed7daecc
- https://git.kernel.org/stable/c/d0b704e569ac3b8416d8e02270cdc9bf830ed395
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.