CVE-2026-64002 (GCVE-0-2026-64002)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:56 – Updated: 2026-08-05 12:38
VLAI
Title
ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 122ff243f5f104194750ecbc76d5946dd1eec934 , < ecf45080a4d3f4526cacb8b14060fe3b49a6913b (git)
Affected: 122ff243f5f104194750ecbc76d5946dd1eec934 , < a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c (git)
Affected: 122ff243f5f104194750ecbc76d5946dd1eec934 , < 5b23a2ff379e70b6b9ff744a972b63e1f8f4d996 (git)
Affected: 122ff243f5f104194750ecbc76d5946dd1eec934 , < 8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57 (git)
Affected: 122ff243f5f104194750ecbc76d5946dd1eec934 , < 6512c57c4638ddec113bf42439361ba85a12048d (git)
Affected: 122ff243f5f104194750ecbc76d5946dd1eec934 , < a7f4eefb6e1458431eef9fa20fb363320d185f76 (git)
Affected: 122ff243f5f104194750ecbc76d5946dd1eec934 , < 155f90be5ee8be5b110ebc0b7da33c54c83b0208 (git)
Affected: 122ff243f5f104194750ecbc76d5946dd1eec934 , < 87a1e0fe7776da7ab411be332b4be58ac8840d10 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (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: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
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            "net/ipv4/sysctl_net_ipv4.c"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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                  "versionStartIncluding": "3.16",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.210",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.1.176",
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                  "vulnerable": true
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                  "versionStartIncluding": "3.16",
                  "vulnerable": true
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
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      ],
      "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": {
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            "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"
          },
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              "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"
      },
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          "url": "https://git.kernel.org/stable/c/ecf45080a4d3f4526cacb8b14060fe3b49a6913b"
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          "url": "https://git.kernel.org/stable/c/a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c"
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        },
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        },
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        },
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          "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()",
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    "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"
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      "date": "2026-09-02",
      "epss": "0.00129",
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/proc/sys/net/ipv4/ip_local_reserved_ports.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/sysctl_net_ipv4.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"122ff243f5f104194750ecbc76d5946dd1eec934\",\"lessThan\":\"ecf45080a4d3f4526cacb8b14060fe3b49a6913b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"122ff243f5f104194750ecbc76d5946dd1eec934\",\"lessThan\":\"a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"122ff243f5f104194750ecbc76d5946dd1eec934\",\"lessThan\":\"5b23a2ff379e70b6b9ff744a972b63e1f8f4d996\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"122ff243f5f104194750ecbc76d5946dd1eec934\",\"lessThan\":\"8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"122ff243f5f104194750ecbc76d5946dd1eec934\",\"lessThan\":\"6512c57c4638ddec113bf42439361ba85a12048d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"122ff243f5f104194750ecbc76d5946dd1eec934\",\"lessThan\":\"a7f4eefb6e1458431eef9fa20fb363320d185f76\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"122ff243f5f104194750ecbc76d5946dd1eec934\",\"lessThan\":\"155f90be5ee8be5b110ebc0b7da33c54c83b0208\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"122ff243f5f104194750ecbc76d5946dd1eec934\",\"lessThan\":\"87a1e0fe7776da7ab411be332b4be58ac8840d10\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/sysctl_net_ipv4.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/155f90be5ee8be5b110ebc0b7da33c54c83b0208\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b23a2ff379e70b6b9ff744a972b63e1f8f4d996\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6512c57c4638ddec113bf42439361ba85a12048d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87a1e0fe7776da7ab411be332b4be58ac8840d10\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7f4eefb6e1458431eef9fa20fb363320d185f76\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ecf45080a4d3f4526cacb8b14060fe3b49a6913b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-02T14:41:31+00:00",
      "cve": "CVE-2026-64002",
      "id": "CVE-2026-64002",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "1218",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv4: free net-\u003eipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64002.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-17T16:42:22Z",
      "cve": "CVE-2026-64002",
      "id": "CVE-2026-64002",
      "initial_release_date": "2026-07-21T13:01:48Z",
      "product_status:known_affected": "286",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64002",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64002.json",
      "version": "4"
    }
  }
}



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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

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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.


Detection rules are retrieved from Rulezet.