CVE-2026-53249
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.
How to fix
- linux linux_kernel5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13 or later
- git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578
- git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7
- git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691
- git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2
- git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278
- git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d
- git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1
- git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.12.1 ≤ v < 5.10.259, 5.11 ≤ v < 5.15.210, 5.16 ≤ v < 6.1.176, 6.2 ≤ v < 6.6.143, 6.7 ≤ v < 6.12.94, 6.13 ≤ v < 6.18.36, 6.19 ≤ v < 7.0.13, 2.6.12, 7.1 | 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13 |
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