Vulnerability in Linux

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund14 Oct 2026WID-SEC-2026-3951

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-98426CVE-2026-98416CVE-2026-98393+43 more CVEs

[ References ]References

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