bpf: Skip unsettled links in link iterator

{
  "id": "044b1a98011dd3c6cd5be4605375c5e144a8744173d10dfdb54fb1bbd20466f5",
  "url": "https://osv.dev/vulnerability/CVE-2026-98378",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Skip unsettled links in link iterator",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Skip unsettled links in link iterator bpf_link_prime() inserts a link into link_idr before anon_inode_getfile() succeeds and before bpf_link_settle() publishes the ID in link->id. bpf_link_by_id() treats such an ID-zero link as unsettled, but the link iterator takes a reference without this check. If anon_inode_getfile() then fails, the creator removes the ID and frees its still-private link directly. The iterator is left with a dangling reference and its next bpf_link_put() accesses freed memory. Treat ID-zero entries as transient in bpf_link_get_curr_or_next(), just as bpf_link_by_id() does. BUG: KASAN: slab-use-after-free in bpf_link_put Write of size 8 by task exp/384 Call Trace: bpf_link_put kernel/bpf/syscall.c:3372 bpf_link_seq_next kernel/bpf/link_iter.c:33 bpf_seq_read kernel/bpf/bpf_iter.c:158 vfs_read fs/read_write.c:572 ksys_read fs/read_write.c:716 do_syscall_64 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:121 Kernel panic - not syncing: KASAN: panic_on_warn set ...",
    "evidence": "osv:CVE-2026-98378",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.55",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-98378",
      "aliases": [
        "CVE-2026-98378"
      ],
      "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": [
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                  "fixed": "68930f8d40ab4c10ca3b019f076136758fd100a8"
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                  "fixed": "c251ed48bd9063cf7de6049421e78b6de989060f"
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                  "fixed": "798a61edbc436cacdb659927d067368eeb1e30e2"
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                  "fixed": "6e271f093d15d323f42de26f66556af53fa8e19f"
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                {
                  "fixed": "87ce4b53b7436b50fc984f0a6afaf77f68ac5573"
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            "name": "Kernel",
            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:50.180088477Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/50e80e2bb5e2be8515205b9c496b9640ddefa434",
        "https://git.kernel.org/stable/c/68930f8d40ab4c10ca3b019f076136758fd100a8",
        "https://git.kernel.org/stable/c/6e271f093d15d323f42de26f66556af53fa8e19f",
        "https://git.kernel.org/stable/c/798a61edbc436cacdb659927d067368eeb1e30e2",
        "https://git.kernel.org/stable/c/87ce4b53b7436b50fc984f0a6afaf77f68ac5573",
        "https://git.kernel.org/stable/c/c251ed48bd9063cf7de6049421e78b6de989060f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98378.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98378",
        "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/2026/98xxx/CVE-2026-98378.json"
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    "related_cves": [
      {
        "value": "CVE-2026-98378",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518627,
  "published_at": "2026-10-09T07:34:18.626+00:00"
}