CVE-2021-47386

Summary

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

hwmon: (w83791d) 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 multi-line alignment]

Affected Software

VendorProductVersion RangeStatus
LinuxLinux358d2071100d84cfe6ef4a9d70ac0d998a1d501e < 44d3c480e4e2a75bf6296a18b4356157991ccd80affected
LinuxLinux358d2071100d84cfe6ef4a9d70ac0d998a1d501e < 516d9055039017a20a698103be2b556b4c976bb8affected
LinuxLinux358d2071100d84cfe6ef4a9d70ac0d998a1d501e < 16887ae4e3defd2c4e7913b6c539f33eaf4eac5caffected
LinuxLinux358d2071100d84cfe6ef4a9d70ac0d998a1d501e < 943c15ac1b84d378da26bba41c83c67e16499ac4affected
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