CVE-2026-53249

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options

State: Published
Severity: Not scored
Published: Jun 25, 2026
Updated: Oct 15, 2026
Reserved: Jun 9, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 89343ff12b3178fc236fe531a3603e7c97c68278Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8ff85dbabbbfb05e86e6cde31d91ac5782179d4dAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 00e8845fe3428c69e980dce5071cb3da1d8f7578Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a4f3fd6516920988c47ba8d19714985c40c816a1Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 28f5ad1b4055405eb1616e603fe511ba5e3725e7Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7cAffected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 89343ff12b3178fc236fe531a3603e7c97c68278Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8ff85dbabbbfb05e86e6cde31d91ac5782179d4dAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 00e8845fe3428c69e980dce5071cb3da1d8f7578Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a4f3fd6516920988c47ba8d19714985c40c816a1Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 28f5ad1b4055405eb1616e603fe511ba5e3725e7Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7cAffected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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