CVE-2026-53219 (GCVE-0-2026-53219)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-11-10 12:48
VLAI
Title
netfilter: x_tables: avoid leaking percpu counter pointers
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:22 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 71ae0dff02d756e4d2ca710b79f2ff5390029a5f , < b74ba3343eb44b2cbf7e9665918c287df1d52ebb (git)
Affected: 71ae0dff02d756e4d2ca710b79f2ff5390029a5f , < 0b35dc8527ccc16b7dc34e8a3164313e68cd4e45 (git)
Affected: 71ae0dff02d756e4d2ca710b79f2ff5390029a5f , < b28e2fcad3db7e8687b15bc20bced26b5b7c920e (git)
Affected: 71ae0dff02d756e4d2ca710b79f2ff5390029a5f , < a0d16941adf3a501956d74aefd8d6e217906e79c (git)
Affected: 71ae0dff02d756e4d2ca710b79f2ff5390029a5f , < 8d67e42ad3b1a95a152541015a07110e06992d6c (git)
Affected: 71ae0dff02d756e4d2ca710b79f2ff5390029a5f , < 08a3e218064db11f154ad9ad5541751ea7f34ebe (git)
Affected: 71ae0dff02d756e4d2ca710b79f2ff5390029a5f , < fb0521aff1e10e300d89725cc439d3ea74c828c5 (git)
Affected: 71ae0dff02d756e4d2ca710b79f2ff5390029a5f , < f7f2fbb0e893a0238dc464f8d8c0f5609bec584f (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Affected: V3.1.7 , < * (custom)
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "b74ba3343eb44b2cbf7e9665918c287df1d52ebb",
                  "status": "affected",
                  "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
                  "versionType": "git"
                },
                {
                  "lessThan": "0b35dc8527ccc16b7dc34e8a3164313e68cd4e45",
                  "status": "affected",
                  "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
                  "versionType": "git"
                },
                {
                  "lessThan": "b28e2fcad3db7e8687b15bc20bced26b5b7c920e",
                  "status": "affected",
                  "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
                  "versionType": "git"
                },
                {
                  "lessThan": "a0d16941adf3a501956d74aefd8d6e217906e79c",
                  "status": "affected",
                  "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
                  "versionType": "git"
                },
                {
                  "lessThan": "8d67e42ad3b1a95a152541015a07110e06992d6c",
                  "status": "affected",
                  "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
                  "versionType": "git"
                },
                {
                  "lessThan": "08a3e218064db11f154ad9ad5541751ea7f34ebe",
                  "status": "affected",
                  "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
                  "versionType": "git"
                },
                {
                  "lessThan": "fb0521aff1e10e300d89725cc439d3ea74c828c5",
                  "status": "affected",
                  "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
                  "versionType": "git"
                },
                {
                  "lessThan": "f7f2fbb0e893a0238dc464f8d8c0f5609bec584f",
                  "status": "affected",
                  "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/ipv4/netfilter/arp_tables.c",
                "net/ipv4/netfilter/ip_tables.c",
                "net/ipv6/netfilter/ip6_tables.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.2"
                },
                {
                  "lessThan": "4.2",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.259",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.210",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.176",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.143",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.94",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.36",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.0.*",
                  "status": "unaffected",
                  "version": "7.0.13",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.1",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.259",
                      "versionStartIncluding": "4.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.210",
                      "versionStartIncluding": "4.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.176",
                      "versionStartIncluding": "4.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.143",
                      "versionStartIncluding": "4.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.94",
                      "versionStartIncluding": "4.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.36",
                      "versionStartIncluding": "4.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.0.13",
                      "versionStartIncluding": "4.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.1",
                      "versionStartIncluding": "4.2",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: avoid leaking percpu counter pointers\n\nThe native and compat get-entries paths copy the fixed rule entry header\nfrom the kernelized rule blob to userspace before overwriting the entry\u0027s\ncounter fields with a sanitized counter snapshot.\n\nOn SMP kernels, entry-\u003ecounters.pcnt contains the percpu allocation\naddress used by x_tables rule counters. A caller can provide a userspace\nbuffer that faults during the initial fixed-header copy after pcnt has\nbeen copied but before the later sanitized counter copy runs. The syscall\nthen returns -EFAULT while leaving the raw percpu pointer in userspace.\n\nCopy only the fixed entry prefix before counters from the kernelized rule\nblob, then copy the sanitized counter snapshot into the counter field.\nApply this ordering to the IPv4, IPv6, and ARP native and compat\nget-entries implementations so a fault cannot expose the internal percpu\ncounter pointer."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-25T08:39:21.730Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb"
            },
            {
              "url": "https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45"
            },
            {
              "url": "https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e"
            },
            {
              "url": "https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c"
            },
            {
              "url": "https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c"
            },
            {
              "url": "https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe"
            },
            {
              "url": "https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5"
            },
            {
              "url": "https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f"
            }
          ],
          "title": "netfilter: x_tables: avoid leaking percpu counter pointers",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-53219",
        "datePublished": "2026-06-25T08:39:21.730Z",
        "dateReserved": "2026-06-09T07:44:35.392Z",
        "dateUpdated": "2026-11-10T12:48:13.813Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.