CVE-2021-47386: hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field
First published: Tue May 21 2024(Updated: )
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]
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.4.151 | 5.4.151 |
| redhat/kernel | <5.10.71 | 5.10.71 |
| redhat/kernel | <5.14.10 | 5.14.10 |
| redhat/kernel | <5.15 | 5.15 |
| Linux Kernel | <5.4.151 | |
| Linux Kernel | >=5.5<5.10.71 | |
| Linux Kernel | >=5.11<5.14.10 | |
| Linux Kernel | =5.15-rc1 | |
| Linux Kernel | =5.15-rc2 | |
| Linux Kernel | =5.15-rc3 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2021-47386
- https://lore.kernel.org/linux-cve-announce/2024052145-CVE-2021-47386-2701@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:7001
- https://access.redhat.com/errata/RHSA-2024:7000
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2282354
- 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
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2021-47386?
The severity of CVE-2021-47386 is categorized as low, as it involves a NULL pointer dereference in the hwmon subsystem of the Linux kernel.
How do I fix CVE-2021-47386?
To fix CVE-2021-47386, upgrade your Linux kernel to version 5.4.151, 5.10.71, or later versions that have mitigated this vulnerability.
Which Linux kernel versions are affected by CVE-2021-47386?
CVE-2021-47386 affects Linux kernel versions prior to 5.4.151, 5.10.71, 5.14.10, and 5.15.
Does CVE-2021-47386 affect all distributions of Linux?
CVE-2021-47386 is specifically relevant to distributions that use the affected versions of the Linux kernel, particularly those from Red Hat.
Is CVE-2021-47386 exploitable in production environments?
While CVE-2021-47386 poses a low severity risk, any vulnerability in a production environment should be assessed, as exploitation can lead to system instability.
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