net: sched: fix ets qdisc OOB Indexing

{
  "id": "f3a155bf97c212c5392d0973a5da8d9f17bacf55dcce7722e99c120f9034e5a4",
  "url": "https://osv.dev/vulnerability/CVE-2025-21692",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: sched: fix ets qdisc OOB Indexing",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: sched: fix ets qdisc OOB Indexing Haowei Yan found that ets_class_from_arg() can index an Out-Of-Bound class in ets_class_from_arg() when passed clid of 0. The overflow may cause local privilege escalation. [ 18.852298] ------------[ cut here ]------------ [ 18.853271] UBSAN: array-index-out-of-bounds in net/sched/sch_ets.c:93:20 [ 18.853743] index 18446744073709551615 is out of range for type 'ets_class [16]' [ 18.854254] CPU: 0 UID: 0 PID: 1275 Comm: poc Not tainted 6.12.6-dirty #17 [ 18.854821] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 [ 18.856532] Call Trace: [ 18.857441] [ 18.858227] dump_stack_lvl+0xc2/0xf0 [ 18.859607] dump_stack+0x10/0x20 [ 18.860908] __ubsan_handle_out_of_bounds+0xa7/0xf0 [ 18.864022] ets_class_change+0x3d6/0x3f0 [ 18.864322] tc_ctl_tclass+0x251/0x910 [ 18.864587] ? lock_acquire+0x5e/0x140 [ 18.865113] ? __mutex_lock+0x9c/0xe70 [ 18.866009] ? __mutex_lock+0xa34/0xe70 [ 18.866401] rtnetlink_rcv_msg+0x170/0x6f0 [ 18.866806] ? __lock_acquire+0x578/0xc10 [ 18.867184] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 18.867503] netlink_rcv_skb+0x59/0x110 [ 18.867776] rtnetlink_rcv+0x15/0x30 [ 18.868159] netlink_unicast+0x1c3/0x2b0 [ 18.868440] netlink_sendmsg+0x239/0x4b0 [ 18.868721] ____sys_sendmsg+0x3e2/0x410 [ 18.869012] ___sys_sendmsg+0x88/0xe0 [ 18.869276] ? rseq_ip_fixup+0x198/0x260 [ 18.869563] ? rseq_update_cpu_node_id+0x10a/0x190 [ 18.869900] ? trac",
    "evidence": "osv:CVE-2025-21692",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.234",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.178",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.128",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.75",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.12",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.13.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-21692",
      "aliases": [
        "CVE-2025-21692"
      ],
      "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": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33"
                },
                {
                  "fixed": "03c56665dab1f4ac844bc156652d50d639093fa5"
                },
                {
                  "fixed": "bcf0d815e728a3a304b50455b32a3170c16e1eaa"
                },
                {
                  "fixed": "1332c6ed446be787f901ed1064ec6a3c694f028a"
                },
                {
                  "fixed": "f4168299e553f17aa2ba4016e77a9c38da40eb1d"
                },
                {
                  "fixed": "997f6ec4208b23c87daf9f044689685f091826f7"
                },
                {
                  "fixed": "f6b0f05fbfa4044f890e8a348288c0d9a20bd1d0"
                },
                {
                  "fixed": "d62b04fca4340a0d468d7853bd66e511935a18cb"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21692.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.6.0"
                },
                {
                  "fixed": "5.10.234"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.178"
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              ]
            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "5.16.0"
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                {
                  "fixed": "6.1.128"
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              ]
            },
            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.2.0"
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                {
                  "fixed": "6.6.75"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.12"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.13.1"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21692.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.081908403Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-355557.html",
        "https://git.kernel.org/stable/c/03c56665dab1f4ac844bc156652d50d639093fa5",
        "https://git.kernel.org/stable/c/1332c6ed446be787f901ed1064ec6a3c694f028a",
        "https://git.kernel.org/stable/c/997f6ec4208b23c87daf9f044689685f091826f7",
        "https://git.kernel.org/stable/c/bcf0d815e728a3a304b50455b32a3170c16e1eaa",
        "https://git.kernel.org/stable/c/d62b04fca4340a0d468d7853bd66e511935a18cb",
        "https://git.kernel.org/stable/c/f4168299e553f17aa2ba4016e77a9c38da40eb1d",
        "https://git.kernel.org/stable/c/f6b0f05fbfa4044f890e8a348288c0d9a20bd1d0",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21692.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21692",
        "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/2025/21xxx/CVE-2025-21692.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-21692",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491300,
  "published_at": "2025-02-10T15:58:48.087+00:00"
}