FKIE_CVE-2026-53219

Vulnerability from fkie_nvd - Published: 2026-06-25 09:16 - Updated: 2026-06-30 14:44
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "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": [
            {
              "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-53219",
  "lastModified": "2026-06-30T14:44:27.313",
  "metrics": {},
  "published": "2026-06-25T09:16:39.613",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.