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A vulnerability in the Linux kernel's IPv4 GRE implementation (ip_gre) related to the ipgre_header() function has been resolved. The issue involved kernel crashes triggered by dynamic changes in device header lengths, which could be exploited to cause denial of service via kernel panic. This vulnerability was identified through syzbot fuzzing and affects various Linux kernel versions prior to specific patched releases. The vulnerability has a medium severity score and a fix is available in updated Linux kernel packages.

The Linux kernel contained a vulnerability in the IPv4 GRE (Generic Routing Encapsulation) code, specifically in the ipgre_header() function. Over time, syzbot fuzzing discovered multiple ways to crash the kernel due to improper handling of dynamic changes in device header lengths (dev->needed_headroom and dev->hard_header_len). This could lead to kernel panics caused by invalid skb (socket buffer) allocations with insufficient headroom, resulting in a BUG triggered in skbuff.c. The vulnerability was fixed by making ipgre_header() more robust, analogous to a prior fix in the IPv6 GRE code. The issue affects multiple Linux kernel versions prior to the patched releases in the 5.15 series and others as listed. The vulnerability has a CVSS 3.1 score of 5.5 (medium severity) with local attack vector, low complexity, requiring low privileges, no user interaction, and impacts availability only. No known exploits in the wild have been reported. Ubuntu has released patches for affected kernel versions, including those for NVIDIA Tegra and other platforms, requiring system updates and reboot.

Detailed information about UBUNTU-CVE-2026-23011 affecting null linux. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23011 - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: ipv4: ip_gre: make ipgre_header() robust Analog to commit db5b4e39c4e6… (CVE-2026-23011)

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