CVE-2026-64002 (GCVE-0-2026-64002)
Vulnerability from cvelistv5
Published
2026-07-19 14:56
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: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() ipv4_sysctl_exit_net() is currently freeing net->ipv4.sysctl_local_reserved_ports too soon. Only after unregister_net_sysctl_table() we can be sure no threads can possibly use the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports.
References
Impacted products
Vendor Product Version
Linux Linux Version: 122ff243f5f104194750ecbc76d5946dd1eec934
Version: 122ff243f5f104194750ecbc76d5946dd1eec934
Version: 122ff243f5f104194750ecbc76d5946dd1eec934
Version: 122ff243f5f104194750ecbc76d5946dd1eec934
Version: 122ff243f5f104194750ecbc76d5946dd1eec934
Version: 122ff243f5f104194750ecbc76d5946dd1eec934
Version: 122ff243f5f104194750ecbc76d5946dd1eec934
Version: 122ff243f5f104194750ecbc76d5946dd1eec934
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/sysctl_net_ipv4.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ecf45080a4d3f4526cacb8b14060fe3b49a6913b",
              "status": "affected",
              "version": "122ff243f5f104194750ecbc76d5946dd1eec934",
              "versionType": "git"
            },
            {
              "lessThan": "a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c",
              "status": "affected",
              "version": "122ff243f5f104194750ecbc76d5946dd1eec934",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "122ff243f5f104194750ecbc76d5946dd1eec934",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "122ff243f5f104194750ecbc76d5946dd1eec934",
              "versionType": "git"
            },
            {
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            },
            {
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/sysctl_net_ipv4.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.16"
            },
            {
              "lessThan": "3.16",
              "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": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "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": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.210",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.93",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: free net-\u003eipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()\n\nipv4_sysctl_exit_net() is currently freeing net-\u003eipv4.sysctl_local_reserved_ports\ntoo soon.\n\nOnly after unregister_net_sysctl_table() we can be sure no threads can possibly\nuse the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports."
        }
      ],
      "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 - Exploitation requires local syscalls\u2014network namespace teardown via unshare/setns/put_net, sysctl access to /proc/sys/net/ipv4/ip_local_reserved_ports, and/or local socket bind/connect\u2014not remote packet delivery.\nAC:L - The attacker can control both sides of the race by concurrently tearing down a network namespace while hammering the sysctl or triggering socket port selection in that namespace.\nPR:L - An unprivileged local user can reach this via user namespaces (CAP_SYS_ADMIN within the user_ns for CLONE_NEWNET) and world-writable sysctl access (mode 0644) during namespace destruction.\nUI:N - No victim interaction is required beyond the attacker\u0027s own concurrent namespace teardown and sysctl or socket activity.\nS:U - The UAF corrupts kernel heap memory within the same kernel security domain; it is standard local kernel memory corruption, not a VM/hypervisor boundary escape.\nC:H - Freed 8 KiB bitmap memory remains reachable via sysctl reads (find_next_bit) and inet_is_local_reserved_port() (test_bit), enabling heap information disclosure through a use-after-free.\nI:H - Sysctl writes via proc_do_large_bitmap perform bitmap_copy/bitmap_or into the freed allocation, providing a heap write primitive exploitable for control-flow hijacking.\nA:H - Concurrent access to the freed bitmap can cause kernel oops/panic from invalid memory access, and UAF exploitation inherently threatens kernel availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:02.672Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ecf45080a4d3f4526cacb8b14060fe3b49a6913b"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b23a2ff379e70b6b9ff744a972b63e1f8f4d996"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57"
        },
        {
          "url": "https://git.kernel.org/stable/c/6512c57c4638ddec113bf42439361ba85a12048d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7f4eefb6e1458431eef9fa20fb363320d185f76"
        },
        {
          "url": "https://git.kernel.org/stable/c/155f90be5ee8be5b110ebc0b7da33c54c83b0208"
        },
        {
          "url": "https://git.kernel.org/stable/c/87a1e0fe7776da7ab411be332b4be58ac8840d10"
        }
      ],
      "title": "ipv4: free net-\u003eipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64002",
    "datePublished": "2026-07-19T14:56:19.495Z",
    "dateReserved": "2026-07-19T07:54:57.026Z",
    "dateUpdated": "2026-08-05T12:38:02.672Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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