CVE-2026-99043 (GCVE-0-2026-99043)
Vulnerability from cvelistv5
Published
2026-10-23 12:22
Modified
2026-10-30 12:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ice: fix metadata_dst refcount handling on representor teardown ice_eswitch_release_repr() uses metadata_dst_free() to release the representor's metadata_dst. metadata_dst_free() directly frees the underlying memory without checking the dst_entry refcount. When ice_eswitch_port_start_xmit() processes a packet, it takes a reference via dst_hold() and attaches the metadata_dst to the skb. If the representor is torn down while packets are still queued on the lower device (e.g. in a qdisc), the metadata_dst is freed while references are still held. Use dst_release() instead, which correctly decrements the refcount and only frees the object when all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set. Other drivers sharing this pattern (nfp, airoha, bnxt) already use dst_release() for their metadata_dst lifecycle.
References
Impacted products
Vendor Product Version
Linux Linux Version: f5396b8a663f7a78ee5b75a47ee524b40795b265
Version: f5396b8a663f7a78ee5b75a47ee524b40795b265
Version: f5396b8a663f7a78ee5b75a47ee524b40795b265
Version: f5396b8a663f7a78ee5b75a47ee524b40795b265
Version: f5396b8a663f7a78ee5b75a47ee524b40795b265
Version: f5396b8a663f7a78ee5b75a47ee524b40795b265
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/intel/ice/ice_eswitch.c"
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          "vendor": "Linux",
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nice: fix metadata_dst refcount handling on representor teardown\n\nice_eswitch_release_repr() uses metadata_dst_free() to release the\nrepresentor\u0027s metadata_dst.  metadata_dst_free() directly frees the\nunderlying memory without checking the dst_entry refcount.\n\nWhen ice_eswitch_port_start_xmit() processes a packet, it takes a\nreference via dst_hold() and attaches the metadata_dst to the skb.\nIf the representor is torn down while packets are still queued on\nthe lower device (e.g. in a qdisc), the metadata_dst is freed while\nreferences are still held.\n\nUse dst_release() instead, which correctly decrements the refcount\nand only frees the object when all references are dropped.  The dst\nsubsystem already handles metadata_dst cleanup in dst_destroy() when\nDST_METADATA is set.\n\nOther drivers sharing this pattern (nfp, airoha, bnxt) already use\ndst_release() for their metadata_dst lifecycle."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:41:15.899Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/41f0d9ab158fb51f34bded5f8a40918e4f70b2b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f263235651775f93c15d90c9f25c3f4a4ef6512"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f5544f53f1e58ea8a49fb9f9158d5793b9205b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/beb05f484a1e4a5a66e3678e4b7f3147f651c080"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e4d20db5179e83a4948927bc39e489a9a83256d"
        },
        {
          "url": "https://git.kernel.org/stable/c/58858b8f14803a7eeac297b3ce20f3b21bf2ff66"
        }
      ],
      "title": "ice: fix metadata_dst refcount handling on representor teardown",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99043",
    "datePublished": "2026-10-23T12:22:07.372Z",
    "dateReserved": "2026-09-25T10:25:14.387Z",
    "dateUpdated": "2026-10-30T12:41:15.899Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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