CVE-2026-46259 (GCVE-0-2026-46259)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:49 – Updated: 2026-06-03 15:49
VLAI
Title
procfs: fix missing RCU protection when reading real_parent in do_task_stat()
Summary
In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading real_parent in do_task_stat() When reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- do_task_stat var = task->real_parent release_task call_rcu(delayed_put_task_struct) task_tgid_nr_ns(var) rcu_read_lock <--- Too late to protect task->real_parent! task_pid_ptr <--- UAF! rcu_read_unlock This patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add proper RCU protection for accessing task->real_parent.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < fefa0fcd78be465b7ad4c497fa6ec90d64194c04 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < c93a33f28f915d446eea6fb3f0e1def0b3af1982 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 1c8dc5b5517546c68ffae40b948336122bb61306 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 73ec7c96601d61d52310c659145bb06d933a0fa6 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 4f9ae386861e280b7631ca252f798d25575627ee (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 76149d53502cf17ef3ae454ff384551236fba867 (git)
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Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-03T15:49:56.428Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46259",
    "datePublished": "2026-06-03T15:49:56.428Z",
    "dateReserved": "2026-05-13T15:03:33.108Z",
    "dateUpdated": "2026-06-03T15:49:56.428Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46259\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-03T18:16:26.987\",\"lastModified\":\"2026-06-03T18:16:26.987\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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