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netfilter: x_tables: avoid leaking percpu counter pointers

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-53219

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-53219

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
        "lessThan": "b74ba3343eb44b2cbf7e9665918c287df1d52ebb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
        "lessThan": "0b35dc8527ccc16b7dc34e8a3164313e68cd4e45",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
        "lessThan": "b28e2fcad3db7e8687b15bc20bced26b5b7c920e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
        "lessThan": "a0d16941adf3a501956d74aefd8d6e217906e79c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
        "lessThan": "8d67e42ad3b1a95a152541015a07110e06992d6c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
        "lessThan": "08a3e218064db11f154ad9ad5541751ea7f34ebe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
        "lessThan": "fb0521aff1e10e300d89725cc439d3ea74c828c5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f",
        "lessThan": "f7f2fbb0e893a0238dc464f8d8c0f5609bec584f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv4/netfilter/arp_tables.c",
      "net/ipv4/netfilter/ip_tables.c",
      "net/ipv6/netfilter/ip6_tables.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv4/netfilter/arp_tables.c",
      "net/ipv4/netfilter/ip_tables.c",
      "net/ipv6/netfilter/ip6_tables.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53219

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28441 · Revision 1
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Publisher date
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