CVE-2026-74685 hwmon: (ltc4282) Clamp negative current limits
A local attacker with high privileges can trigger an integer overflow in the LTC4282 hardware monitoring driver, causing incorrect current limit settings.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74685?
CVE-2026-74685 is a vulnerability in Linux, published on 22 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
hwmon: (ltc4282) Clamp negative current limits
When a negative value is passed to ltc4282_write_curr(), the signed long val is cast directly to u64:
drivers/hwmon/ltc4282.c:ltc4282_write_curr() { /* need to pass it in millivolt */ u32 in = DIV_ROUND_CLOSEST_ULL((u64)val * st->rsense, DECA * MICRO); ... }
This cast converts negative inputs into large positive values. The subsequent division result overflows the u32 in variable, truncating to a pseudo-random positive value. When this is passed to ltc4282_write_voltage_byte(), it is clamped to the maximum limit instead of zero.
Clamp val to 0 and to the maximum supported upper limit before the cast and assign the result to a 64-bit temporary variable before the division to avoid the underflow and an also possible overflow.
Which versions are affected by CVE-2026-74685?
How do I fix CVE-2026-74685?
Apply the vendor's patch.
Is CVE-2026-74685 being exploited?
There is no known exploitation of CVE-2026-74685 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74685, DEBIAN-CVE-2026-74685, GHSA-pg82-jq9q-m7pf, UBUNTU-CVE-2026-74685.