CVE-2026-53249 is a vulnerability in Linux Kernel
Published on June 25, 2026
ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options
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.
Products Associated with CVE-2026-53249
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 89343ff12b3178fc236fe531a3603e7c97c68278 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 8ff85dbabbbfb05e86e6cde31d91ac5782179d4d is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 00e8845fe3428c69e980dce5071cb3da1d8f7578 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below a4f3fd6516920988c47ba8d19714985c40c816a1 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 28f5ad1b4055405eb1616e603fe511ba5e3725e7 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c is affected.
- Version 2.6.12 is affected.
- Before 2.6.12 is unaffected.
- Version 5.10.259, <= 5.10.* is unaffected.
- Version 5.15.210, <= 5.15.* is unaffected.
- Version 6.1.176, <= 6.1.* is unaffected.
- Version 6.6.143, <= 6.6.* is unaffected.
- Version 6.12.94, <= 6.12.* is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.