Bug 2451216 (CVE-2026-23323)

Summary: CVE-2026-23323 kernel: hwmon: (macsmc) Fix regressions in Apple Silicon SMC hwmon driver
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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OS: Linux   
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A flaw was found in the Linux kernel's macsmc-hwmon driver, which is responsible for managing hardware monitoring on Apple Silicon systems. Incorrect sensor population logic could lead to out-of-bounds memory access or data corruption. Additionally, a flaw in the float conversion routines could result in incorrect values being written to the System Management Controller (SMC), a subsystem that controls hardware functions. These issues could lead to system instability or unreliable manual fan control.
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Description OSIDB Bzimport 2026-03-25 11:05:12 UTC
In the Linux kernel, the following vulnerability has been resolved:

hwmon: (macsmc) Fix regressions in Apple Silicon SMC hwmon driver

The recently added macsmc-hwmon driver contained several critical
bugs in its sensor population logic and float conversion routines.

Specifically:
- The voltage sensor population loop used the wrong prefix ("volt-"
  instead of "voltage-") and incorrectly assigned sensors to the
  temperature sensor array (hwmon->temp.sensors) instead of the
  voltage sensor array (hwmon->volt.sensors). This would lead to
  out-of-bounds memory access or data corruption when both temperature
  and voltage sensors were present.
- The float conversion in macsmc_hwmon_write_f32() had flawed exponent
  logic for values >= 2^24 and lacked masking for the mantissa, which
  could lead to incorrect values being written to the SMC.

Fix these issues to ensure correct sensor registration and reliable
manual fan control.

Confirm that the reported overflow in FIELD_PREP is fixed by declaring
macsmc_hwmon_write_f32() as __always_inline for a compile test.