CVE-2022-49749: i2c: designware: use casting of u64 in clock multiplication to avoid overflow
First published: Thu Mar 27 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: i2c: designware: use casting of u64 in clock multiplication to avoid overflow In functions i2c_dw_scl_lcnt() and i2c_dw_scl_hcnt() may have overflow by depending on the values of the given parameters including the ic_clk. For example in our use case where ic_clk is larger than one million, multiplication of ic_clk * 4700 will result in 32 bit overflow. Add cast of u64 to the calculation to avoid multiplication overflow, and use the corresponding define for divide.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=3.2<5.10.166 | |
| Linux Kernel | >=5.11<5.15.91 | |
| Linux Kernel | >=5.16<6.1.9 | |
| Linux Kernel | =6.2-rc1 | |
| Linux Kernel | =6.2-rc2 | |
| Linux Kernel | =6.2-rc3 | |
| Linux Kernel | =6.2-rc4 | |
| Linux Kernel | =6.2-rc5 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2022-49749?
CVE-2022-49749 is rated as a high severity vulnerability in the Linux kernel.
How do I fix CVE-2022-49749?
To fix CVE-2022-49749, update your Linux kernel to the latest patched version.
Which versions of the Linux kernel are affected by CVE-2022-49749?
CVE-2022-49749 affects multiple versions of the Linux kernel prior to the fixed release.
What kind of attack vector is associated with CVE-2022-49749?
CVE-2022-49749 may be exploited through local privileges escalation due to improper parameter handling.
Is there a workaround for CVE-2022-49749?
There is no specific workaround for CVE-2022-49749; the recommended action is to apply the latest kernel updates.
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