Answer in brief
CVE-2026-53219 records a Medium severity (CVSS 5.5) vulnerability in netfilter: x_tables: avoid leaking percpu counter pointers. 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 | >=71ae0dff02d756e4d2ca710b79f2ff5390029a5f <b74ba3343eb44b2cbf7e9665918c287df1d52ebb || >=71ae0dff02d756e4d2ca710b79f2ff5390029a5f <0b35dc8527ccc16b7dc34e8a3164313e68cd4e45 || >=71ae0dff02d756e4d2ca710b79f2ff5390029a5f <b28e2fcad3db7e8687b15bc20bced26b5b7c920e || >=71ae0dff02d756e4d2ca710b79f2ff5390029a5f <a0d16941adf3a501956d74aefd8d6e217906e79c || >=71ae0dff02d756e4d2ca710b79f2ff5390029a5f <8d67e42ad3b1a95a152541015a07110e06992d6c || >=71ae0dff02d756e4d2ca710b79f2ff5390029a5f <08a3e218064db11f154ad9ad5541751ea7f34ebe || >=71ae0dff02d756e4d2ca710b79f2ff5390029a5f <fb0521aff1e10e300d89725cc439d3ea74c828c5 || >=71ae0dff02d756e4d2ca710b79f2ff5390029a5f <f7f2fbb0e893a0238dc464f8d8c0f5609bec584f | b74ba3343eb44b2cbf7e9665918c287df1d52ebb, 0b35dc8527ccc16b7dc34e8a3164313e68cd4e45, b28e2fcad3db7e8687b15bc20bced26b5b7c920e, a0d16941adf3a501956d74aefd8d6e217906e79c, 8d67e42ad3b1a95a152541015a07110e06992d6c, 08a3e218064db11f154ad9ad5541751ea7f34ebe, fb0521aff1e10e300d89725cc439d3ea74c828c5, f7f2fbb0e893a0238dc464f8d8c0f5609bec584f |
| Linux/Linuxgeneric | 4.2 | 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: netfilter: x_tables: avoid leaking percpu counter pointers The native and compat get-entries paths copy the fixed rule entry header from the kernelized rule blob to userspace before overwriting the entry's counter fields with a sanitized counter snapshot. On SMP kernels, entry->counters.pcnt contains the percpu allocation address used by x_tables rule counters. A caller can provide a userspace buffer that faults during the initial fixed-header copy after pcnt has been copied but before the later sanitized counter copy runs. The syscall then returns -EFAULT while leaving the raw percpu pointer in userspace. Copy only the fixed entry prefix before counters from the kernelized rule blob, then copy the sanitized counter snapshot into the counter field. Apply this ordering to the IPv4, IPv6, and ARP native and compat get-entries implementations so a fault cannot expose the internal percpu counter pointer.
Quoted source text, attributed separately from HOL analysis.