CVE-2026-53219netfilter: x_tables: avoid leaking percpu counter pointers
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- 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 71ae0dff02d756e4d2ca710b79f2ff5390029a5f before b74ba3343eb44b2cbf7e9665918c287df1d52ebb; 71ae0dff02d756e4d2ca710b79f2ff5390029a5f builds before 0b35dc8527ccc16b7dc34e8a3164313e68cd4e45; from 71ae0dff02d756e4d2ca710b79f2ff5390029a5f before b28e2fcad3db7e8687b15bc20bced26b5b7c920e; from 71ae0dff02d756e4d2ca710b79f2ff5390029a5f before a0d16941adf3a501956d74aefd8d6e217906e79c; 71ae0dff02d756e4d2ca710b79f2ff5390029a5f builds before 8d67e42ad3b1a95a152541015a07110e06992d6c; 71ae0dff02d756e4d2ca710b79f2ff5390029a5f builds before 08a3e218064db11f154ad9ad5541751ea7f34ebe; from 71ae0dff02d756e4d2ca710b79f2ff5390029a5f before fb0521aff1e10e300d89725cc439d3ea74c828c5; from 71ae0dff02d756e4d2ca710b79f2ff5390029a5f before f7f2fbb0e893a0238dc464f8d8c0f5609bec584f | 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 4.2 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; 7.1; and 6 more ranges | NVD |
References
- https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebbpatch
- https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45patch
- https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920epatch
- https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79cpatch
- https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6cpatch
- https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebepatch
- https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5patch
- https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584fpatch
- 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.