What’s Vulnerable › Vulnerabilities

CVE-2026-98417: net: xfrm: reject unrepresentable espintcp transport headers

• 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: 2026-10-14 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: net: xfrm: reject unrepresentable espintcp transport headers ESP-in-TCP can hand xfrm packets whose transport header offset no longer fits after the stream parser trims the TCP envelope. The plain transport header reset truncates that offset and triggers the skb warning path. Use the careful transport-header helper and drop the skb through the existing XFRM error path when the offset cannot be represented.

Affected products

• Linux kernel: 5.6 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/206f396f46149dc8bc4dfd2b54b9879ba3ee1d7d
• https://git.kernel.org/stable/c/327b2a457dd7d5445f7395f371f3c65de79bd5ce
• https://git.kernel.org/stable/c/4a8243fd2e21980fa3fd10c0610e9155057cebd3
• https://git.kernel.org/stable/c/6c29681207bc213188afa603dff2d55e7178a341
• https://git.kernel.org/stable/c/96f01b53c2d05e003b040892256de54a586e8529
• https://git.kernel.org/stable/c/b2b84e73e0386ad0b4f9b8d3afde343e761f5275
• https://git.kernel.org/stable/c/cce630c751279e974fa0bb574d80575e0cc7e8f3
• https://git.kernel.org/stable/c/d37a5b87577c4b4c1a1dcb000a9dff1df2cf886b

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