CVE-2026-53230 (GCVE-0-2026-53230)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI
Title
net/mlx5: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list mlx5_query_nic_vport_mac_list() sizes its firmware command buffer using the PF's log_max_current_uc/mc_list capabilities. When querying a VF vport with a larger configured max (via devlink), the firmware response can overflow this buffer: BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x453/0x4c0 [mlx5_core] Read of size 4 at addr ff1100013ffc8a12 by task kworker/u96:2/385 CPU: 12 UID: 0 PID: 385 Comm: kworker/u96:2 Not tainted 7.0.0-rc6+ #1 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009) Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core] Call Trace: <TASK> dump_stack_lvl+0x69/0xa0 print_report+0x176/0x4e4 kasan_report+0xc8/0x100 mlx5_query_nic_vport_mac_list+0x453/0x4c0 [mlx5_core] esw_update_vport_addr_list+0x2e3/0xda0 [mlx5_core] esw_vport_change_handle_locked+0xa1f/0x1060 [mlx5_core] esw_vport_change_handler+0x6a/0x90 [mlx5_core] process_one_work+0x87f/0x15e0 worker_thread+0x62b/0x1020 kthread+0x375/0x490 ret_from_fork+0x4dc/0x810 ret_from_fork_asm+0x11/0x20 </TASK> Fix by querying the vport's own HCA caps to size the buffer correctly. Refactor the function to allocate and return the MAC list internally, removing the caller's dependency on knowing the correct max.
Severity
8.7 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e16aea2744abea612c27ee0eef606c6a6a8204de , < 41781f2789309462520a93822e946521ed78f97f (git)
Affected: e16aea2744abea612c27ee0eef606c6a6a8204de , < 537d87784e81c3d7037525b99416455cee088cdc (git)
Affected: e16aea2744abea612c27ee0eef606c6a6a8204de , < 0f807764bb122fd63aa45f4229cb1ef2679fbd40 (git)
Affected: e16aea2744abea612c27ee0eef606c6a6a8204de , < 2398e497389ed4be43f7cfbab499b49cec7dae1a (git)
Affected: e16aea2744abea612c27ee0eef606c6a6a8204de , < 894e036a24a26a6dd7b17d8d3fb5c53ab48a6074 (git)
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Linux Linux Affected: 4.5
Unaffected: 0 , < 4.5 (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/eswitch.c",
            "drivers/net/ethernet/mellanox/mlx5/core/vport.c",
            "include/linux/mlx5/vport.h"
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            "drivers/net/ethernet/mellanox/mlx5/core/eswitch.c",
            "drivers/net/ethernet/mellanox/mlx5/core/vport.c",
            "include/linux/mlx5/vport.h"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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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\nnet/mlx5: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list\n\nmlx5_query_nic_vport_mac_list() sizes its firmware command buffer using\nthe PF\u0027s log_max_current_uc/mc_list capabilities. When querying a VF\nvport with a larger configured max (via devlink), the firmware response\ncan overflow this buffer:\n\n BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x453/0x4c0 [mlx5_core]\n Read of size 4 at addr ff1100013ffc8a12 by task kworker/u96:2/385\n\n CPU: 12 UID: 0 PID: 385 Comm: kworker/u96:2 Not tainted 7.0.0-rc6+ #1 PREEMPT\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009)\n Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core]\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x69/0xa0\n  print_report+0x176/0x4e4\n  kasan_report+0xc8/0x100\n  mlx5_query_nic_vport_mac_list+0x453/0x4c0 [mlx5_core]\n  esw_update_vport_addr_list+0x2e3/0xda0 [mlx5_core]\n  esw_vport_change_handle_locked+0xa1f/0x1060 [mlx5_core]\n  esw_vport_change_handler+0x6a/0x90 [mlx5_core]\n  process_one_work+0x87f/0x15e0\n  worker_thread+0x62b/0x1020\n  kthread+0x375/0x490\n  ret_from_fork+0x4dc/0x810\n  ret_from_fork_asm+0x11/0x20\n  \u003c/TASK\u003e\n\nFix by querying the vport\u0027s own HCA caps to size the buffer correctly.\nRefactor the function to allocate and return the MAC list internally,\nremoving the caller\u0027s dependency on knowing the correct max."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:H",
            "version": "3.1"
          }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-28T06:40:41.926Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/2398e497389ed4be43f7cfbab499b49cec7dae1a"
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        {
          "url": "https://git.kernel.org/stable/c/894e036a24a26a6dd7b17d8d3fb5c53ab48a6074"
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      ],
      "title": "net/mlx5: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53230",
    "datePublished": "2026-06-25T08:39:29.210Z",
    "dateReserved": "2026-06-09T07:44:35.393Z",
    "dateUpdated": "2026-06-28T06:40:41.926Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-07-01",
      "epss": "0.00131",
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When querying a VF\\nvport with a larger configured max (via devlink), the firmware response\\ncan overflow this buffer:\\n\\n BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x453/0x4c0 [mlx5_core]\\n Read of size 4 at addr ff1100013ffc8a12 by task kworker/u96:2/385\\n\\n CPU: 12 UID: 0 PID: 385 Comm: kworker/u96:2 Not tainted 7.0.0-rc6+ #1 PREEMPT\\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009)\\n Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core]\\n Call Trace:\\n  \u003cTASK\u003e\\n  dump_stack_lvl+0x69/0xa0\\n  print_report+0x176/0x4e4\\n  kasan_report+0xc8/0x100\\n  mlx5_query_nic_vport_mac_list+0x453/0x4c0 [mlx5_core]\\n  esw_update_vport_addr_list+0x2e3/0xda0 [mlx5_core]\\n  esw_vport_change_handle_locked+0xa1f/0x1060 [mlx5_core]\\n  esw_vport_change_handler+0x6a/0x90 [mlx5_core]\\n  process_one_work+0x87f/0x15e0\\n  worker_thread+0x62b/0x1020\\n  kthread+0x375/0x490\\n  ret_from_fork+0x4dc/0x810\\n  ret_from_fork_asm+0x11/0x20\\n  \u003c/TASK\u003e\\n\\nFix by querying the vport\u0027s own HCA caps to size the buffer correctly.\\nRefactor the function to allocate and return the MAC list internally,\\nremoving the caller\u0027s dependency on knowing the correct max.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/mellanox/mlx5/core/eswitch.c\",\"drivers/net/ethernet/mellanox/mlx5/core/vport.c\",\"include/linux/mlx5/vport.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e16aea2744abea612c27ee0eef606c6a6a8204de\",\"lessThan\":\"41781f2789309462520a93822e946521ed78f97f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e16aea2744abea612c27ee0eef606c6a6a8204de\",\"lessThan\":\"537d87784e81c3d7037525b99416455cee088cdc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e16aea2744abea612c27ee0eef606c6a6a8204de\",\"lessThan\":\"0f807764bb122fd63aa45f4229cb1ef2679fbd40\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e16aea2744abea612c27ee0eef606c6a6a8204de\",\"lessThan\":\"2398e497389ed4be43f7cfbab499b49cec7dae1a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e16aea2744abea612c27ee0eef606c6a6a8204de\",\"lessThan\":\"894e036a24a26a6dd7b17d8d3fb5c53ab48a6074\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/mellanox/mlx5/core/eswitch.c\",\"drivers/net/ethernet/mellanox/mlx5/core/vport.c\",\"include/linux/mlx5/vport.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:H\",\"baseScore\":8.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f807764bb122fd63aa45f4229cb1ef2679fbd40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2398e497389ed4be43f7cfbab499b49cec7dae1a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/41781f2789309462520a93822e946521ed78f97f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/537d87784e81c3d7037525b99416455cee088cdc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/894e036a24a26a6dd7b17d8d3fb5c53ab48a6074\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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