CVE-2022-49749: i2c: designware: use casting of u64 in clock multiplication to avoid overflow

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-03-27 · updated 2026-06-17
Weakness: CWE-190

Description

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.

Affected products

Linux kernel: from 3.2 before 5.10.166; from 5.11 before 5.15.91; from 5.16 before 6.1.9; 6.2-rc1, 6.2-rc2, 6.2-rc3, 6.2-rc4, 6.2-rc5 — fixed in 5.10.166, 5.15.91, 6.1.9

How to fix

Upgrade to a fixed version: Linux kernel 5.10.166, 5.15.91, 6.1.9. Check the vendor advisory for mitigations.

References

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