What’s Vulnerable › Vulnerabilities

CVE-2025-40127: hwrng: ks-sa - fix division by zero in ks_sa_rng_init

• Severity: unknown
• 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: 2025-11-12 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: hwrng: ks-sa - fix division by zero in ks_sa_rng_init Fix division by zero in ks_sa_rng_init caused by missing clock pointer initialization. The clk_get_rate() call is performed on an uninitialized clk pointer, resulting in division by zero when calculating delay values. Add clock initialization code before using the clock. drivers/char/hw_random/ks-sa-rng.c | 7 +++++++ 1 file changed, 7 insertions(+)

Affected products

• Linux kernel: 5.5 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2b6bcce32cb5aff84588a844a4d3f6dd5353b8e2
• https://git.kernel.org/stable/c/55a70e1de75e5ff5f961c79a2cdc6a4468cc2bf2
• https://git.kernel.org/stable/c/612b1dfeb414dfa780a6316014ceddf9a74ff5c0
• https://git.kernel.org/stable/c/692a04a1e0cde1d80a33df0078c755cf02cd7268
• https://git.kernel.org/stable/c/d76b099011fa056950f63d05ebb6160991242f6a
• https://git.kernel.org/stable/c/eec7e0e19c1fa75dc65e25aa6a21ef24a03849af
• https://git.kernel.org/stable/c/f4238064379a91e71a9c258996acac43c50c2094

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