CVE-2026-53249ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options
Updated under an hour ago ()
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It affects Linux and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 89343ff12b3178fc236fe531a3603e7c97c68278; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8ff85dbabbbfb05e86e6cde31d91ac5782179d4d; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 00e8845fe3428c69e980dce5071cb3da1d8f7578; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a4f3fd6516920988c47ba8d19714985c40c816a1; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 28f5ad1b4055405eb1616e603fe511ba5e3725e7; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.12.1 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 2.6.12; and 10 more ranges | NVD |
References
- https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2patch
- https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691patch
- https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278patch
- https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4dpatch
- https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578patch
- https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1patch
- https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7patch
- https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7cpatch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.