net: pktgen: fix proc entry use-after-free

{
  "id": "5a603cb4d4b5ba9e4807ec43fae8f1e711926f0c1c35ae1cc7198dd581b7d31c",
  "url": "https://osv.dev/vulnerability/CVE-2026-74479",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: pktgen: fix proc entry use-after-free",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: pktgen: fix proc entry use-after-free pktgen_change_name() replaces pkt_dev->entry while holding t->if_lock. pktgen_remove_device() removes the same entry before _rem_dev_from_if_list() takes that lock. This allows the following interleaving: CPU 0 (NETDEV_CHANGENAME) CPU 1 (kpktgend) if_lock(t) proc_remove(pkt_dev->entry) proc_remove(pkt_dev->entry) pkt_dev->entry = proc_create_data(...) if_unlock(t) The kthread can pass the stale proc_dir_entry to proc_remove() after the rename path has freed it. A reproducer with a widened race window reports: BUG: KASAN: slab-use-after-free in proc_remove+0x78/0x80 Read of size 8 at addr ffff8881478fea70 by task kpktgend_0/67 Call Trace: proc_remove+0x78/0x80 pktgen_remove_device.isra.0+0x11c/0x4c0 pktgen_thread_worker+0x1214/0x6bc0 kthread+0x2c6/0x3b0 Allocated by task 95: __proc_create+0x204/0x790 proc_create_data+0x72/0xe0 pktgen_thread_write+0xd61/0x1510 Freed by task 28: kmem_cache_free+0xcb/0x3d0 proc_free_inode+0x5b/0x80 rcu_core+0x50a/0x1850 The buggy address belongs to the object at ffff8881478fea00 which belongs to the cache proc_dir_entry of size 192 Move proc_remove() into the if_lock-protected list removal helper. Keep it before list_del_rcu() to preserve the ordering required by add_device(). The rename path must then finish replacing the entry before removal, or it observes that the device is no longer on the list.",
    "evidence": "osv:CVE-2026-74479",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.266",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.217",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "7.1.8",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-74479",
      "aliases": [
        "CVE-2026-74479"
      ],
      "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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      "affected": [
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:37.594522551Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4ef801b838d85c0ea5852c50667f7344ce3b6cd0",
        "https://git.kernel.org/stable/c/577443530cb592d5782a1f79847411a9363a65c8",
        "https://git.kernel.org/stable/c/7991c7cff8b8622cddb3d8dee07dbe74aa4cbec4",
        "https://git.kernel.org/stable/c/817ff6efdb7f484ea547218e11e17d8e43daa3b4",
        "https://git.kernel.org/stable/c/82ed3db9269cb61e3c15bad2f6e221efce90e1e0",
        "https://git.kernel.org/stable/c/b006a5404470bd3eb2aa0425fc447183032047ef",
        "https://git.kernel.org/stable/c/d1cc9797cf8f7aeb87e7ad01b748c6a960a819e4",
        "https://git.kernel.org/stable/c/f85a58340b91f225de3299dfa782c6414098077c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74479.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74479",
        "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/2026/74xxx/CVE-2026-74479.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74479",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504944,
  "published_at": "2026-08-15T12:27:13.172+00:00"
}