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CVE-2022-49387: watchdog: rzg2l_wdt: Fix 32bit overflow issue

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-190

Description

In the Linux kernel, the following vulnerability has been resolved: watchdog: rzg2l_wdt: Fix 32bit overflow issue The value of timer_cycle_us can be 0 due to 32bit overflow. For eg:- If we assign the counter value "0xfff" for computing maxval. This patch fixes this issue by appending ULL to 1024, so that it is promoted to 64bit. This patch also fixes the warning message, 'watchdog: Invalid min and max timeout values, resetting to 0!'.

Affected products

• Linux kernel: from 5.17 before 5.17.15; from 5.18 before 5.18.4 — fixed in 5.17.15, 5.18.4

How to fix

Upgrade to a fixed version: Linux kernel 5.17.15, 5.18.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/b95a47667d34e76c2c9013f8e3b1e5039a5a0b76
• https://git.kernel.org/stable/c/e07b9fa0dc32b492de85528caaf9f0c605d8424f
• https://git.kernel.org/stable/c/ea2949df22a533cdf75e4583c00b1ce94cd5a83b

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