CVE-2026-68301 (GCVE-0-2026-68301)
Vulnerability from cvelistv5
Published
2026-08-10 12:02
Modified
2026-08-19 16:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: hsr: fix memory leak on slave unregistration by removing synced VLANs When an HSR master device is brought UP, it auto-adds VLAN 0 via vlan_vid0_add(), which propagates VID 0 to its slave devices (slave A and B). If a slave device is later unregistered while HSR is active (e.g., during netns cleanup or interface destruction), hsr_del_port() is called to detach the slave port from the HSR master. However, hsr_del_port() currently does not delete the VLAN IDs that were synced to the slave device by HSR. As a result, the slave device retains a refcount on VID 0 (and any other synced VLANs). When the slave device is destroyed, its vlan_info / vlan_vid_info structure remains allocated, leading to a memory leak. Fix this by calling vlan_vids_del_by_dev(port->dev, master->dev) in hsr_del_port() before unlinking slave A or slave B ports, matching the propagation logic in hsr_ndo_vlan_rx_add_vid() / hsr_ndo_vlan_rx_kill_vid() and the cleanup behavior in bonding and team drivers.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1100242709d5644856131a9dd25d32672ebe7357
Version: a2accc07bdcfb0c7ab2cacdca6a1fe8267816efa
Version: 72dbae1f2f2159395089405c6c54632f2613f1be
Version: c707d2c5541d2bb94131968ad5dfeb06427a1dba
Version: 1a8a63a5305e95519de6f941922dfcd8179f82e5
Version: 1a8a63a5305e95519de6f941922dfcd8179f82e5
Version: 1a8a63a5305e95519de6f941922dfcd8179f82e5
Version: 5.15.194   ≤
Version: 6.1.153   ≤
Version: 6.6.107   ≤
Version: 6.12.48   ≤
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: fix memory leak on slave unregistration by removing synced VLANs\n\nWhen an HSR master device is brought UP, it auto-adds VLAN 0 via\nvlan_vid0_add(), which propagates VID 0 to its slave devices (slave A and B).\n\nIf a slave device is later unregistered while HSR is active (e.g., during\nnetns cleanup or interface destruction), hsr_del_port() is called to\ndetach the slave port from the HSR master. However, hsr_del_port() currently\ndoes not delete the VLAN IDs that were synced to the slave device by HSR.\n\nAs a result, the slave device retains a refcount on VID 0 (and any other\nsynced VLANs). When the slave device is destroyed, its vlan_info /\nvlan_vid_info structure remains allocated, leading to a memory leak.\n\nFix this by calling vlan_vids_del_by_dev(port-\u003edev, master-\u003edev) in\nhsr_del_port() before unlinking slave A or slave B ports, matching the\npropagation logic in hsr_ndo_vlan_rx_add_vid() / hsr_ndo_vlan_rx_kill_vid()\nand the cleanup behavior in bonding and team drivers."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:32:53.463Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/ccc822e9e4f09a6c2ca73ad5334570441947f94f"
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        {
          "url": "https://git.kernel.org/stable/c/79ff0547676acdeceda445c3fce4071b0a887b70"
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          "url": "https://git.kernel.org/stable/c/f72c312af6c7897ab0f8a2b5a63f917a207a4143"
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          "url": "https://git.kernel.org/stable/c/21d48408479a17eb65568a765930adea37e4d804"
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          "url": "https://git.kernel.org/stable/c/b5ded444621b6180df9f3d4e07045fc1fc1e8cd9"
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        },
        {
          "url": "https://git.kernel.org/stable/c/dcf15eaf5641812f1cfc5e96537380132a7da89d"
        }
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      "title": "net: hsr: fix memory leak on slave unregistration by removing synced VLANs",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68301",
    "datePublished": "2026-08-10T12:02:35.155Z",
    "dateReserved": "2026-07-30T09:28:09.380Z",
    "dateUpdated": "2026-08-19T16:32:53.463Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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