CVE-2021-47386
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 >>…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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]
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.26% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5cPatch
- https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80Patch
- https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8Patch
- https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4Patch
- https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5cPatch
- https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80Patch
- https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8Patch
- https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.