CVE-2026-64078 (GCVE-0-2026-64078)
Vulnerability from cvelistv5
Published
2026-07-19 15:39
Modified
2026-08-05 12:38
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: add and use xtables_unregister_table_exit Previous change added xtables_unregister_table_pre_exit to detach the table from the packetpath and to unlink it from the active table list. In case of rmmod, userspace that is doing set/getsockopt for this table will not be able to re-instantiate the table: 1. The larval table has been removed already 2. existing instantiated table is no longer on the xt pernet table list. This adds the second stage helper: unlink the table from the dying list, free the hook ops (if any) and do the audit notification. It replaces xt_unregister_table().
References
Impacted products
Vendor Product Version
Linux Linux Version: fdacd57c79b79a03c7ca88f706ad9fb7b46831c1
Version: fdacd57c79b79a03c7ca88f706ad9fb7b46831c1
Version: fdacd57c79b79a03c7ca88f706ad9fb7b46831c1
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netfilter/x_tables.h",
            "net/ipv4/netfilter/arp_tables.c",
            "net/ipv4/netfilter/ip_tables.c",
            "net/ipv4/netfilter/iptable_nat.c",
            "net/ipv6/netfilter/ip6_tables.c",
            "net/ipv6/netfilter/ip6table_nat.c",
            "net/netfilter/x_tables.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "86ee5bc9c0f0e652e19f395675a432de11b75514",
              "status": "affected",
              "version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1",
              "versionType": "git"
            },
            {
              "lessThan": "8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf",
              "status": "affected",
              "version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1",
              "versionType": "git"
            },
            {
              "lessThan": "b4597d5fd7d2f8cebfffd40dffb5e003cc78964c",
              "status": "affected",
              "version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/netfilter/x_tables.h",
            "net/ipv4/netfilter/arp_tables.c",
            "net/ipv4/netfilter/ip_tables.c",
            "net/ipv4/netfilter/iptable_nat.c",
            "net/ipv6/netfilter/ip6_tables.c",
            "net/ipv6/netfilter/ip6table_nat.c",
            "net/netfilter/x_tables.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "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": "6.18.34",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: add and use xtables_unregister_table_exit\n\nPrevious change added xtables_unregister_table_pre_exit to detach the\ntable from the packetpath and to unlink it from the active table list.\nIn case of rmmod, userspace that is doing set/getsockopt for this table\nwill not be able to re-instantiate the table:\n 1. The larval table has been removed already\n 2. existing instantiated table is no longer on the xt pernet table list.\n\nThis adds the second stage helper:\n\nunlink the table from the dying list, free the hook ops (if any) and do\nthe audit notification.  It replaces xt_unregister_table()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through local iptables/arptables setsockopt/getsockopt on `IPPROTO_IP`/`IPPROTO_IPV6` sockets (`do_ipt_set_ctl`/`do_ipt_get_ctl`), not by processing remote network packets.\nAC:L - Exploitation is a race between concurrent setsockopt traffic and netns teardown or `rmmod`; the attacker controls both sides (one thread hammering iptables, another deleting the netns or unloading the module) and can retry until the window is hit.\nPR:L - All vulnerable paths require `CAP_NET_ADMIN` in the target network namespace (`ns_capable(sock_net(sk)-\u003euser_ns, CAP_NET_ADMIN)`), which an unprivileged user can obtain inside a user/network namespace via `unshare`.\nUI:N - No victim interaction is required beyond the attacker\u2019s own namespace lifecycle and iptables syscalls.\nS:U - Impact is confined to kernel memory corruption/privilege impact within the same kernel security domain; it is not a cross-VM or cross-container boundary escape.\nC:H - The teardown race leaves `xt_table`/`xt_table_info` reachable via setsockopt while `pre_exit`/`exit` frees them, creating a classic kernel heap use-after-free that can be turned into arbitrary memory disclosure.\nI:H - Concurrent `xt_replace_table()` against a table being torn down can corrupt or replace freed `xt_table_info` memory, enabling arbitrary kernel writes and potential privilege escalation.\nA:H - The race during `cleanup_net` or module unload can trigger kernel oops/panic from use-after-free or leave tables in an unrecoverable broken state affecting system availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:58.654Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/86ee5bc9c0f0e652e19f395675a432de11b75514"
        },
        {
          "url": "https://git.kernel.org/stable/c/8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4597d5fd7d2f8cebfffd40dffb5e003cc78964c"
        }
      ],
      "title": "netfilter: x_tables: add and use xtables_unregister_table_exit",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64078",
    "datePublished": "2026-07-19T15:39:51.582Z",
    "dateReserved": "2026-07-19T07:54:57.031Z",
    "dateUpdated": "2026-08-05T12:38:58.654Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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