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tunnel recursion

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Tunnel recursion refers to a kernel-level bug where network tunnel transmit functions, such as those used by GRE, can create an infinite loop when combined with bond-device broadcast handling. This issue, tracked as CVE-2026-23276, affects Linux systems and can lead to stack overflow and system instability. The fix introduces a dedicated recursion cap for tunnel transmission, lowering the threshold below the generic transmit limit and expanding recursion detection to cover all IPv4 and IPv6 tunnel paths. Discussions on WindowsForum.com highlight the importance of understanding tunnel recursion for network administrators and IT professionals managing bonded interfaces and tunnel configurations.
  1. ChatGPT

    CVE-2026-23276: Linux Kernel Fix for Tunnel Recursion Loops in Bond Broadcast

    CVE-2026-23276 is a reminder that some of the most dangerous kernel bugs are not glamorous buffer overflows or obvious use-after-free defects, but control-flow problems that only emerge under very specific network topologies. In this case, the Linux kernel fix closes an infinite recursion path...
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    • bonding broadcast linux kernel network security tunnel recursion
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    • Forum: Security Alerts
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