CVE-2026-53249

CVE-2026-53249: vulnerability in Linux

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options

Published · Updated

3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 0.1%
exploitation probability
0.1%top 98% of all CVEs
observed exploitation
nono source reports it
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
Linux · Linux
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References
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4dhttps://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c