What’s Vulnerable › Vulnerabilities

CVE-2026-72349: netfilter: xt_rateest: fix u64 truncation in xt_rateest_mt()

• 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: 2026-08-15 · updated 2026-08-17

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_rateest: fix u64 truncation in xt_rateest_mt() On links faster than ~34 Gbps, where byte rate may exceed 2^32-1 (~ 4.3 GBps), the comparison result becomes incorrect because the truncated value no longer reflects the actual estimator rate. Fix by changing the local variables to u64.

Affected products

• Linux kernel: 4.10 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/444853cd438201007da5359821adcc2995655ab1
• https://git.kernel.org/stable/c/5da915fc159c6b4091669447588e520183969cca
• https://git.kernel.org/stable/c/77e9ba358d63fe2eb03c90d29ea85651d95cf2e6
• https://git.kernel.org/stable/c/905a927b2e6fec7b174e9e5644d271047b61378f
• https://git.kernel.org/stable/c/a3ba938f45cb00f6bf49d3aa3647df9b017f5f08
• https://git.kernel.org/stable/c/bab305dd769d78074adca73505cc2509e1206bf2
• https://git.kernel.org/stable/c/d5cc4c12a4b90bf099199c3c49ecda7e694f2a2b
• https://git.kernel.org/stable/c/e702f6dd5d21e331f55fd9168c0210542008546d

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