net/sched: teql: Fix double-free in teql_master_xmit

{
  "id": "a403022fa7e1fd5b7b513e62978048b90bbbb56c5b22d40c838c02001f63d124",
  "url": "https://osv.dev/vulnerability/CVE-2026-23449",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net/sched: teql: Fix double-free in teql_master_xmit",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net/sched: teql: Fix double-free in teql_master_xmit Whenever a TEQL devices has a lockless Qdisc as root, qdisc_reset should be called using the seq_lock to avoid racing with the datapath. Failure to do so may cause crashes like the following: [ 238.028993][ T318] BUG: KASAN: double-free in skb_release_data (net/core/skbuff.c:1139) [ 238.029328][ T318] Free of addr ffff88810c67ec00 by task poc_teql_uaf_ke/318 [ 238.029749][ T318] [ 238.029900][ T318] CPU: 3 UID: 0 PID: 318 Comm: poc_teql_ke Not tainted 7.0.0-rc3-00149-ge5b31d988a41 #704 PREEMPT(full) [ 238.029906][ T318] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 238.029910][ T318] Call Trace: [ 238.029913][ T318] [ 238.029916][ T318] dump_stack_lvl (lib/dump_stack.c:122) [ 238.029928][ T318] print_report (mm/kasan/report.c:379 mm/kasan/report.c:482) [ 238.029940][ T318] ? skb_release_data (net/core/skbuff.c:1139) [ 238.029944][ T318] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221) ... [ 238.029957][ T318] ? skb_release_data (net/core/skbuff.c:1139) [ 238.029969][ T318] kasan_report_invalid_free (mm/kasan/report.c:221 mm/kasan/report.c:563) [ 238.029979][ T318] ? skb_release_data (net/core/skbuff.c:1139) [ 238.029989][ T318] check_slab_allocation (mm/kasan/common.c:231) [ 238.029995][ T318] kmem_cache_free (mm/slub.c:2637 (discriminator 1) mm/slub.c:6168 (discriminator 1) mm/slub.c:6298 (discriminator 1)) [ 238.030004][ T318] skb_release_da",
    "evidence": "osv:CVE-2026-23449",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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          {
            "value": "6.19.10",
            "evidence": "/affected/1/ranges"
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        ],
        "affected_versions": []
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    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-23449",
      "aliases": [
        "CVE-2026-23449"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      ],
      "modified": "2026-10-28T02:30:22.897017999Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
        "https://git.kernel.org/stable/c/21c89a0a8de7eadad8d385645a95b3233f23130e",
        "https://git.kernel.org/stable/c/4a233447b941db451ea5f5a0942cffd0f7f7eaae",
        "https://git.kernel.org/stable/c/4e8ebc4c18ea8213d28e6cb867d18fcc67daca21",
        "https://git.kernel.org/stable/c/66360460cab63c248ca5b1070a01c0c29133b960",
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        "https://git.kernel.org/stable/c/e9c66d3e7d8557b3308e55c613aa07254fe97611",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23449.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23449",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23449.json"
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        "value": "CVE-2026-23449",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489305,
  "published_at": "2026-04-03T15:15:32.15+00:00"
}