Threats Tagged 'cve-2026-53249'

A vulnerability in the Linux kernel related to IPv4 options LSRR and SSRR has been resolved by restricting their use to users with CAP_NET_RAW capability. This prevents unprivileged applications from exploiting these IP options to route packets through attacker-controlled nodes, which could leak TCP ISN and other protocol information. The vulnerability is mitigated by a patch that enforces this restriction. LSRR and SSRR options are often filtered in many networks but may still be forwarded in some environments. RFC 7126 recommends dropping these options to enhance security.

In the Linux kernel, the following vulnerability has been resolved: ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options This patch restricts setting Loose Source and Record Route (LSRR) and Strict Source and Record Route (SSRR) IP options to users with CAP_NET_RAW capability. This prevents unprivileged applications from forcing packets to route through attacker-controlled nodes to leak TCP ISN and possibly other protocol information. While LSRR and SSRR are commonly filtered in many network environments, they may still be supported and forwarded along some network paths. RFC 7126 (Recommendations on Filtering of IPv4 Packets Containing IPv4 Options) recommend to drop these options in 4.3 and 4.4.