{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "06fffb1267c9d986687b69d74a46ee332a50575e"
            },
            {
              "fixed": "fefa0fcd78be465b7ad4c497fa6ec90d64194c04"
            },
            {
              "fixed": "c93a33f28f915d446eea6fb3f0e1def0b3af1982"
            },
            {
              "fixed": "1c8dc5b5517546c68ffae40b948336122bb61306"
            },
            {
              "fixed": "0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e"
            },
            {
              "fixed": "73ec7c96601d61d52310c659145bb06d933a0fa6"
            },
            {
              "fixed": "4f9ae386861e280b7631ca252f798d25575627ee"
            },
            {
              "fixed": "dd8b13cb4ff1a4545a214ed897fdf2bc341155b6"
            },
            {
              "fixed": "76149d53502cf17ef3ae454ff384551236fba867"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.26"
            },
            {
              "fixed": "5.10.252"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.202"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.165"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.128"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.75"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46259.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nprocfs: fix missing RCU protection when reading real_parent in do_task_stat()\n\nWhen reading /proc/[pid]/stat, do_task_stat() accesses task-\u003ereal_parent\nwithout proper RCU protection, which leads to:\n\n  cpu 0                               cpu 1\n  -----                               -----\n  do_task_stat\n    var = task-\u003ereal_parent\n                                      release_task\n                                        call_rcu(delayed_put_task_struct)\n    task_tgid_nr_ns(var)\n      rcu_read_lock   \u003c--- Too late to protect task-\u003ereal_parent!\n      task_pid_ptr    \u003c--- UAF!\n      rcu_read_unlock\n\nThis patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add\nproper RCU protection for accessing task-\u003ereal_parent.",
  "id": "CVE-2026-46259",
  "modified": "2026-07-24T03:57:06.692187560Z",
  "published": "2026-06-03T15:49:56.428Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46259.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46259"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "procfs: fix missing RCU protection when reading real_parent in do_task_stat()"
}