Integer overflow in Linux kernel - CVE-2026-72349

Vulnerability identifier: #VU143087

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-72349

CWE-ID: CWE-190

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to bypass intended rate-based matching logic.

The vulnerability exists due to integer truncation in xt_rateest_mt() in netfilter xt_rateest when processing rate estimator values on high-speed links. A local user can trigger rate comparisons involving byte rates above 2^32-1 to bypass intended rate-based matching logic.

The issue occurs on links faster than approximately 34 Gbps, where the byte rate may exceed 4.3 GBps and no longer fits in 32-bit variables.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• 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

• Integer overflow in Linux kernel netfilter
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0