sysctl: move the "cad_pid" entry from pid_table[] to kern_reboot_table[]

{
  "id": "a44a5fed222b43a6bc54b0645701cd5e1d3f772b6e9953fe5037d58df988f85d",
  "url": "https://osv.dev/vulnerability/CVE-2026-80929",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "sysctl: move the \"cad_pid\" entry from pid_table[] to kern_reboot_table[]",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: sysctl: move the \"cad_pid\" entry from pid_table[] to kern_reboot_table[] cad_pid is global, and kill_cad_pid() is only used in the root namespace. However, due to pid_table_root_permissions(), a non-root user can unshare pid/user namespaces and modify it from the child namespace. This makes no sense and is simply wrong. Move it to kern_reboot_table[] where it logically belongs; this ensures that only GLOBAL_ROOT_UID can read/modify this sysctl. Note that this patch doesn't preserve \"#ifdef CONFIG_PROC_SYSCTL\" around the \"cad_pid\"; CONFIG_PROC_SYSCTL selects CONFIG_SYSCTL, so it is always set when kern_reboot_table[] is compiled.",
    "evidence": "osv:CVE-2026-80929",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-80929",
      "aliases": [
        "CVE-2026-80929"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "e8527de7fea191fda704792a56081f9009aeec37"
                },
                {
                  "fixed": "a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd"
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                {
                  "fixed": "7170ca01623b399c97f2ae9d3e228badc1f25ea3"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80929.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.17.0"
                },
                {
                  "fixed": "6.18.50"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80929.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.339566688Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/7170ca01623b399c97f2ae9d3e228badc1f25ea3",
        "https://git.kernel.org/stable/c/a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd",
        "https://git.kernel.org/stable/c/e8527de7fea191fda704792a56081f9009aeec37",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80929.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80929",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80929.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80929",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521338,
  "published_at": "2026-09-11T19:42:04.778+00:00"
}