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CVE-2026-53249 ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options

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.

Affected products and versions

Product	Affected versions	Fixed in
Linux 7.1	earliest → < 7.1	7.1
Linux 7.0	earliest → < 7.0.13	7.0.13
Linux 6.18	earliest → < 6.18.36	6.18.36
Linux 6.12	earliest → < 6.12.94	6.12.94
Linux 6.6	earliest → < 6.6.143	6.6.143
Linux 6.1	earliest → < 6.1.176	6.1.176
Linux 5.15	earliest → < 5.15.210	5.15.210
Linux 5.10	earliest → < 5.10.259	5.10.259
Linux	2.6.12	No fix stated

Show the 4 other branches

Product	Affected versions	Fixed in
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem	Versions not published