CVE-2021-47384: hwmon: (w83793) 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: (w83793) Fix NULL pointer dereference by removing unnecessary structure field If driver read tmp value sufficient for (tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 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 alignments]
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://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623
- https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616
- https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc
- https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783
- https://access.redhat.com/security/cve/CVE-2021-47384
- https://lore.kernel.org/linux-cve-announce/2024052144-CVE-2021-47384-f311@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:7001
- https://access.redhat.com/errata/RHSA-2024:6993
- https://access.redhat.com/errata/RHSA-2024:7000
- https://access.redhat.com/errata/RHSA-2024:8614
- https://access.redhat.com/errata/RHSA-2024:8613
- https://access.redhat.com/errata/RHSA-2024:9315
- https://access.redhat.com/errata/RHSA-2024:11313
- https://bugzilla.redhat.com/show_bug.cgi?id=2282356
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2021-47384?
CVE-2021-47384 has been classified as a low-severity vulnerability in the Linux kernel.
How do I fix CVE-2021-47384?
To fix CVE-2021-47384, you need to update the Linux kernel to versions 5.4.151, 5.10.71, 5.14.10, or 5.15.
Which Linux kernel versions are affected by CVE-2021-47384?
CVE-2021-47384 affects Linux kernel versions prior to 5.4.151, 5.10.71, 5.14.10, and 5.15.
What is the impact of CVE-2021-47384?
The impact of CVE-2021-47384 is a potential NULL pointer dereference vulnerability when certain driver conditions are met.
Is CVE-2021-47384 specific to any Linux distribution?
CVE-2021-47384 is relevant to multiple Linux distributions that use the affected kernel versions, including Red Hat.
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