CVE-2021-47385

Summary

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field

If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients().

The patch fixes possible NULL pointer dereference by removing lm75[].

Found by Linux Driver Verification project (linuxtesting.org).

[groeck: Dropped unnecessary continuation lines, fixed multipline alignment]

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf64211151db4269341ee6432ce832ae3756725ad < 200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1affected
LinuxLinuxf64211151db4269341ee6432ce832ae3756725ad < 1499bb2c3a87a2efea0065adab2bd66badee61c3affected
LinuxLinuxf64211151db4269341ee6432ce832ae3756725ad < 24af1fe376e22c42238a4a604d31e46c486876c3affected
LinuxLinuxf64211151db4269341ee6432ce832ae3756725ad < 0f36b88173f028e372668ae040ab1a496834d278affected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux5.4.151 <= 5.4.*unaffected
LinuxLinux5.10.71 <= 5.10.*unaffected
LinuxLinux5.14.10 <= 5.14.*unaffected
LinuxLinux5.15 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References