Answer in brief
CVE-2026-53249 records a Medium severity (CVSS 5.5) vulnerability in ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89343ff12b3178fc236fe531a3603e7c97c68278 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8ff85dbabbbfb05e86e6cde31d91ac5782179d4d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <00e8845fe3428c69e980dce5071cb3da1d8f7578 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a4f3fd6516920988c47ba8d19714985c40c816a1 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28f5ad1b4055405eb1616e603fe511ba5e3725e7 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c | 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2, 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691, 89343ff12b3178fc236fe531a3603e7c97c68278, 8ff85dbabbbfb05e86e6cde31d91ac5782179d4d, 00e8845fe3428c69e980dce5071cb3da1d8f7578, a4f3fd6516920988c47ba8d19714985c40c816a1, 28f5ad1b4055405eb1616e603fe511ba5e3725e7, d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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.
Quoted source text, attributed separately from HOL analysis.