Vulnerability-Lookup

CVE-2025-39947 (GCVE-0-2025-39947)

Vulnerability from cvelistv5 – Published: 2025-10-04 07:31 – Updated: 2026-05-11 21:39

Title

net/mlx5e: Harden uplink netdev access against device unbind

Summary

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Harden uplink netdev access against device unbind The function mlx5_uplink_netdev_get() gets the uplink netdevice pointer from mdev->mlx5e_res.uplink_netdev. However, the netdevice can be removed and its pointer cleared when unbound from the mlx5_core.eth driver. This results in a NULL pointer, causing a kernel panic. BUG: unable to handle page fault for address: 0000000000001300 at RIP: 0010:mlx5e_vport_rep_load+0x22a/0x270 [mlx5_core] Call Trace: <TASK> mlx5_esw_offloads_rep_load+0x68/0xe0 [mlx5_core] esw_offloads_enable+0x593/0x910 [mlx5_core] mlx5_eswitch_enable_locked+0x341/0x420 [mlx5_core] mlx5_devlink_eswitch_mode_set+0x17e/0x3a0 [mlx5_core] devlink_nl_eswitch_set_doit+0x60/0xd0 genl_family_rcv_msg_doit+0xe0/0x130 genl_rcv_msg+0x183/0x290 netlink_rcv_skb+0x4b/0xf0 genl_rcv+0x24/0x40 netlink_unicast+0x255/0x380 netlink_sendmsg+0x1f3/0x420 __sock_sendmsg+0x38/0x60 __sys_sendto+0x119/0x180 do_syscall_64+0x53/0x1d0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Ensure the pointer is valid before use by checking it for NULL. If it is valid, immediately call netdev_hold() to take a reference, and preventing the netdevice from being freed while it is in use.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/2cb17c88edd3a1c7a…
https://git.kernel.org/stable/c/d1f3db4e7a3be29fc…
https://git.kernel.org/stable/c/8df354eb2dd63d111…
https://git.kernel.org/stable/c/6b4be64fd9fec1641…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 7a9fb35e8c3a67145fca262c304de65cb2f83abf , < 2cb17c88edd3a1c7aa6bc880dcdb35a6866fcb2e (git) Affected: 7a9fb35e8c3a67145fca262c304de65cb2f83abf , < d1f3db4e7a3be29fc17f01850f162363f919370d (git) Affected: 7a9fb35e8c3a67145fca262c304de65cb2f83abf , < 8df354eb2dd63d111ed5ae2e956e0dbb22bcf93b (git) Affected: 7a9fb35e8c3a67145fca262c304de65cb2f83abf , < 6b4be64fd9fec16418f365c2d8e47a7566e9eba5 (git)	guessed
Linux	Linux	Affected: 5.13 Unaffected: 0 , < 5.13 (semver) Unaffected: 6.6.108 , ≤ 6.6.* (semver) Unaffected: 6.12.49 , ≤ 6.12.* (semver) Unaffected: 6.16.9 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)	guessed

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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en_rep.c",
            "drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c",
            "drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h",
            "include/linux/mlx5/driver.h"
          ],
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            "drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h",
            "include/linux/mlx5/driver.h"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Harden uplink netdev access against device unbind\n\nThe function mlx5_uplink_netdev_get() gets the uplink netdevice\npointer from mdev-\u003emlx5e_res.uplink_netdev. However, the netdevice can\nbe removed and its pointer cleared when unbound from the mlx5_core.eth\ndriver. This results in a NULL pointer, causing a kernel panic.\n\n BUG: unable to handle page fault for address: 0000000000001300\n at RIP: 0010:mlx5e_vport_rep_load+0x22a/0x270 [mlx5_core]\n Call Trace:\n  \u003cTASK\u003e\n  mlx5_esw_offloads_rep_load+0x68/0xe0 [mlx5_core]\n  esw_offloads_enable+0x593/0x910 [mlx5_core]\n  mlx5_eswitch_enable_locked+0x341/0x420 [mlx5_core]\n  mlx5_devlink_eswitch_mode_set+0x17e/0x3a0 [mlx5_core]\n  devlink_nl_eswitch_set_doit+0x60/0xd0\n  genl_family_rcv_msg_doit+0xe0/0x130\n  genl_rcv_msg+0x183/0x290\n  netlink_rcv_skb+0x4b/0xf0\n  genl_rcv+0x24/0x40\n  netlink_unicast+0x255/0x380\n  netlink_sendmsg+0x1f3/0x420\n  __sock_sendmsg+0x38/0x60\n  __sys_sendto+0x119/0x180\n  do_syscall_64+0x53/0x1d0\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nEnsure the pointer is valid before use by checking it for NULL. If it\nis valid, immediately call netdev_hold() to take a reference, and\npreventing the netdevice from being freed while it is in use."
        }
      ],
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        "dateUpdated": "2026-05-11T21:39:30.137Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6b4be64fd9fec16418f365c2d8e47a7566e9eba5"
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    "cveId": "CVE-2025-39947",
    "datePublished": "2025-10-04T07:31:08.636Z",
    "dateReserved": "2025-04-16T07:20:57.148Z",
    "dateUpdated": "2026-05-11T21:39:30.137Z",
    "state": "PUBLISHED"
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      "date": "2026-09-14",
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    },
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      "cve": "CVE-2025-39947",
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      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/mlx5e: Harden uplink netdev access against device unbind",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39947.json",
      "version": "1"
    },
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This results in a NULL pointer, causing a kernel panic.\\n\\n BUG: unable to handle page fault for address: 0000000000001300\\n at RIP: 0010:mlx5e_vport_rep_load+0x22a/0x270 [mlx5_core]\\n Call Trace:\\n  \u003cTASK\u003e\\n  mlx5_esw_offloads_rep_load+0x68/0xe0 [mlx5_core]\\n  esw_offloads_enable+0x593/0x910 [mlx5_core]\\n  mlx5_eswitch_enable_locked+0x341/0x420 [mlx5_core]\\n  mlx5_devlink_eswitch_mode_set+0x17e/0x3a0 [mlx5_core]\\n  devlink_nl_eswitch_set_doit+0x60/0xd0\\n  genl_family_rcv_msg_doit+0xe0/0x130\\n  genl_rcv_msg+0x183/0x290\\n  netlink_rcv_skb+0x4b/0xf0\\n  genl_rcv+0x24/0x40\\n  netlink_unicast+0x255/0x380\\n  netlink_sendmsg+0x1f3/0x420\\n  __sock_sendmsg+0x38/0x60\\n  __sys_sendto+0x119/0x180\\n  do_syscall_64+0x53/0x1d0\\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\\n\\nEnsure the pointer is valid before use by checking it for NULL. If it\\nis valid, immediately call netdev_hold() to take a reference, and\\npreventing the netdevice from being freed while it is in 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T01:25:25+00:00",
      "cve": "CVE-2025-39947",
      "id": "CVE-2025-39947",
      "initial_release_date": "2025-10-04T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5e: Harden uplink netdev access against device unbind",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39947.json",
      "version": "3"
    }
  }
}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2025-39947 (GCVE-0-2025-39947)

WID-SEC-W-2025-2194

Tags

Sightings

Nomenclature