CVE-2021-47604: vduse: check that offset is within bounds in get_config()
First published: Wed Jun 19 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: vduse: check that offset is within bounds in get_config() This condition checks "len" but it does not check "offset" and that could result in an out of bounds read if "offset > dev->config_size". The problem is that since both variables are unsigned the "dev->config_size - offset" subtraction would result in a very high unsigned value. I think these checks might not be necessary because "len" and "offset" are supposed to already have been validated using the vhost_vdpa_config_validate() function. But I do not know the code perfectly, and I like to be safe.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.15<5.15.11 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-47604?
CVE-2021-47604 is classified as a medium severity vulnerability.
How do I fix CVE-2021-47604?
To fix CVE-2021-47604, update your Linux kernel to version 5.15.12 or later.
Which versions of the Linux kernel are affected by CVE-2021-47604?
CVE-2021-47604 affects Linux kernel versions between 5.15 and 5.15.11.
What type of vulnerability is CVE-2021-47604?
CVE-2021-47604 is an out-of-bounds read vulnerability.
What components of the Linux kernel does CVE-2021-47604 impact?
CVE-2021-47604 specifically impacts the vduse component of the Linux kernel.
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