CVE-2026-53249

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578Patch
• https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7Patch
• https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691Patch
• https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2Patch
• https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278Patch
• https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4dPatch
• https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1Patch
• https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7cPatch