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

Vulnerability from cvelistv5 – Published: 2025-10-04 07:31 – Updated: 2026-05-11 21:39
VLAI
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
References
Impacted 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 Create a notification for this product.
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 Create a notification for this product.
Show details on NVD website
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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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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T01:25:25+00:00",
      "cve": "CVE-2025-39947",
      "id": "CVE-2025-39947",
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      "product_status:known_affected": "246",
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      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T16:33:38Z",
      "cve": "CVE-2025-39947",
      "id": "CVE-2025-39947",
      "initial_release_date": "2025-10-05T02:52:22Z",
      "product_status:first_fixed": "2",
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      "product_status:known_not_affected": "387",
      "product_status:recommended": "464",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39947",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39947.json",
      "version": "43"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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