CVE-2021-47098

Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations Commit b50aa49638c7 ("hwmon: (lm90) Prevent integer underflows of temperature calculations") addressed a number of underflow situations when writing temperature limits. However, it missed one situation, seen when an attempt is made to set the hysteresis value to MAX_LONG and the critical temperature limit is negative. Use clamp_val() when setting the hysteresis temperature to ensure that the provided value can never overflow or underflow.

CVSS Metrics

• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 3%

Techniques & Countermeasures

• CWE-190•Integer Overflow or Wraparound

  The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Affected Systems

• linux•linux

  ≥ b50aa49638c7e12abf4ecc483f4e928c5cccc1b0, < d105f30bea9104c590a9e5b495cb8a49bdfe405f | ≥ b50aa49638c7e12abf4ecc483f4e928c5cccc1b0, < 55840b9eae5367b5d5b29619dc2fb7e4596dba46 | 5.14

• linux•linux_kernel

  ≥ 5.14, < 5.15.2 | 5.16:rc1 | 5.16:rc2 | 5.16:rc3 | 5.16:rc4 | 5.16:rc5 | 5.16:rc6

References (2)

• https://git.kernel.org/stable/c/d105f30bea9104c590a9e5b495cb8a49bdfe405f
• https://git.kernel.org/stable/c/55840b9eae5367b5d5b29619dc2fb7e4596dba46