{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21919",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21919"
  ],
  "published": "2025-04-01T15:40:16Z",
  "summary": "sched/fair: Fix potential memory corruption in child_cfs_rq_on_list",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix potential memory corruption in child_cfs_rq_on_list\n\nchild_cfs_rq_on_list attempts to convert a 'prev' pointer to a cfs_rq.\nThis 'prev' pointer can originate from struct rq's leaf_cfs_rq_list,\nmaking the conversion invalid and potentially leading to memory\ncorruption. Depending on the relative positions of leaf_cfs_rq_list and\nthe task group (tg) pointer within the struct, this can cause a memory\nfault or access garbage data.\n\nThe issue arises in list_add_leaf_cfs_rq, where both\ncfs_rq->leaf_cfs_rq_list and rq->leaf_cfs_rq_list are added to the same\nleaf list. Also, rq->tmp_alone_branch can be set to rq->leaf_cfs_rq_list.\n\nThis adds a check `if (prev == &rq->leaf_cfs_rq_list)` after the main\nconditional in child_cfs_rq_on_list. This ensures that the container_of\noperation will convert a correct cfs_rq struct.\n\nThis check is sufficient because only cfs_rqs on the same CPU are added\nto the list, so verifying the 'prev' pointer against the current rq's list\nhead is enough.\n\nFixes a potential memory corruption issue that due to current struct\nlayout might not be manifesting as a crash but could lead to unpredictable\nbehavior when the layout changes.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21919"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5cb300dcdd27e6a351ac02541e0231261c775852"
    },
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      "url": "https://git.kernel.org/stable/c/000c9ee43928f2ce68a156dd40bab7616256f4dd"
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    },
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      "url": "https://git.kernel.org/stable/c/e1dd09df30ba86716cb2ffab97dc35195c01eb8f"
    },
    {
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
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