net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master

{
  "id": "b536bf806a5d4105d361eef2dcf6fd2cc108c88bbf2250bcf48c2dfcd13971a7",
  "url": "https://osv.dev/vulnerability/CVE-2026-53069",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master syzkaller reported a kernel panic in bond_rr_gen_slave_id() reached via xdp_master_redirect(). Full decoded trace: https://syzkaller.appspot.com/bug?extid=80e046b8da2820b6ba73 bond_rr_gen_slave_id() dereferences bond->rr_tx_counter, a per-CPU counter that bonding only allocates in bond_open() when the mode is round-robin. If the bond device was never brought up, rr_tx_counter stays NULL. The XDP redirect path can still reach that code on a bond that was never opened: bpf_master_redirect_enabled_key is a global static key, so as soon as any bond device has native XDP attached, the XDP_TX -> xdp_master_redirect() interception is enabled for every slave system-wide. The path xdp_master_redirect() -> bond_xdp_get_xmit_slave() -> bond_xdp_xmit_roundrobin_slave_get() -> bond_rr_gen_slave_id() then runs against a bond that has no rr_tx_counter and crashes. Fix this in the generic xdp_master_redirect() by refusing to call into the master's ->ndo_xdp_get_xmit_slave() when the master device is not up. IFF_UP is only set after ->ndo_open() has successfully returned, so this reliably excludes masters whose XDP state has not been fully initialized. Drop the frame with XDP_ABORTED so the exception is visible via trace_xdp_exception() rather than silently falling through. This is not specific to bonding: any current or future master that defers XDP state ",
    "evidence": "osv:CVE-2026-53069",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.209",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.175",
            "evidence": "/affected/1/ranges"
          },
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            "value": "6.6.141",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-53069",
      "aliases": [
        "CVE-2026-53069"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53069.json"
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              "type": "ECOSYSTEM",
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                  "introduced": "5.15.0"
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            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:33.783448900Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/183128da0406b1c10e6f60b7b9fe70788b9c8c1d",
        "https://git.kernel.org/stable/c/1921f91298d1388a0bb9db8f83800c998b649cb3",
        "https://git.kernel.org/stable/c/3128b294b426533c8d9162187446d93a8a160359",
        "https://git.kernel.org/stable/c/7bad93e99737e4a5c0c14ac50c05152cf4e28022",
        "https://git.kernel.org/stable/c/866d3d9b87751b1944168fd82615505e0c0fd6cf",
        "https://git.kernel.org/stable/c/acbf45bd584d924b320bee2a7fe2a26f64904d95",
        "https://git.kernel.org/stable/c/ea690b3b6e58ae00979af8195b4cc24df466b65e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53069.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53069",
        "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/2026/53xxx/CVE-2026-53069.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53069",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501097,
  "published_at": "2026-06-24T16:30:10.93+00:00"
}