What’s Vulnerable › Vulnerabilities

CVE-2026-74747: ipvs: revalidate ihl to prevent out-of-bounds access

• Severity: high (CVSS 7.8 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: 2026-08-26 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: revalidate ihl to prevent out-of-bounds access While the outer IP header is already pulled into the skb head, we must be careful and revalidate the embedded headers after reading them from the skb frags to prevent out-of-bounds access. One such place reported by Sashiko is ip_vs_nat_icmp() where local process can change the ihl field and after skb_ensure_writable() we can see larger value which is a problem for the ip_send_check(cih) calls. Add check to drop the packet if the ihl field is changed.

Affected products

• Linux: 2.6.12 — fixed in 7.2

How to fix

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

References

• https://git.kernel.org/stable/c/041b2303c8019394735c1f76c5138657bf660a7d
• https://git.kernel.org/stable/c/2512289cbf58706fd558e8fccea4e28003a2af54
• https://git.kernel.org/stable/c/5365f012451fce2453f13a568dcb72ea534c1e4d
• https://git.kernel.org/stable/c/d93660df4dd1d116f608ada4a29a80a5d6f0a6ed
• https://git.kernel.org/stable/c/eb81c8e758f49e04391f77d9470a6232bb5f1c7a
• https://git.kernel.org/stable/c/f55bb94946fb8ee6304590a731c39c1fbc3b28bc

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