Vulnerability Description
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.
References
- https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578
- https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7
- https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691
- https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2
- https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278
- https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d
- https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1
- https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c
FAQ
What is CVE-2026-53249?
CVE-2026-53249 is a documented vulnerability. 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 Sour...
How severe is CVE-2026-53249?
CVSS scoring is not yet available for CVE-2026-53249. Check NVD for updates.
Is there a patch for CVE-2026-53249?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.