CVE-2025-53109: 
JavaScript vulnerability analysis and mitigation

CVE-2025-53109 is a vulnerability discovered in the Linux kernel affecting network tunneling functionality, specifically involving data races in IP tunnels. The vulnerability was identified and disclosed on May 2, 2025, affecting the handling of dev->needed_headroom during packet transmission in the Linux kernel (NVD, Wiz).

The vulnerability manifests as a data race condition in the iptunnelxmit function, specifically affecting the handling of dev->neededheadroom during packet transmission. The issue was detected through KCSAN (Kernel Concurrency Sanitizer) which identified concurrent access to memory at address 0xffff88815b9da0ec involving 2 bytes of data. IP tunnels can update dev->neededheadroom in their xmit path, affecting three tunnels xmit and the core LLRESERVEDSPACE() and LLRESERVEDSPACE_EXTRA() helpers (NVD).

The vulnerability affects the network tunneling functionality in the Linux kernel, potentially leading to race conditions during packet transmission through IP tunnels. This could impact the stability and reliability of network communications using affected tunnel interfaces (Wiz).

The issue has been addressed through patches in various Linux distributions. Ubuntu has released updates for multiple kernel versions including linux-aws, linux-azure, linux-gcp, linux-oracle, linux-raspi, and linux-realtime systems. Users are advised to update their systems to the patched versions (Wiz).