CVE-2021-47386
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 358d2071100d84cfe6ef4a9d70ac0d998a1d501e < 44d3c480e4e2a75bf6296a18b4356157991ccd80 | affected |
| Linux | Linux | 358d2071100d84cfe6ef4a9d70ac0d998a1d501e < 516d9055039017a20a698103be2b556b4c976bb8 | affected |
| Linux | Linux | 358d2071100d84cfe6ef4a9d70ac0d998a1d501e < 16887ae4e3defd2c4e7913b6c539f33eaf4eac5c | affected |
| Linux | Linux | 358d2071100d84cfe6ef4a9d70ac0d998a1d501e < 943c15ac1b84d378da26bba41c83c67e16499ac4 | affected |
| Linux | Linux | 5.4 | affected |
| Linux | Linux | 0 < 5.4 | unaffected |
| Linux | Linux | 5.4.151 <= 5.4.* | unaffected |
| Linux | Linux | 5.10.71 <= 5.10.* | unaffected |
| Linux | Linux | 5.14.10 <= 5.14.* | unaffected |
| Linux | Linux | 5.15 <= * | unaffected |
Weaknesses
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
CVE Program Container
Additional References
- https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80
- https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8
- https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c
- https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4
References
- https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80
- https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8
- https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c
- https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4
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