CVE-2021-47235

2024-05-2115:15:12

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

linux

kernel

vulnerability

ethernet

use-after-free

nvd

pci

potential

fix

netdev

pointer

6.8 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.1%

JSON

In the Linux kernel, the following vulnerability has been resolved:

net: ethernet: fix potential use-after-free in ec_bhf_remove

static void ec_bhf_remove(struct pci_dev *dev)
{
…
struct ec_bhf_priv *priv = netdev_priv(net_dev);

unregister_netdev(net_dev);
free_netdev(net_dev);

pci_iounmap(dev, priv-&gt;dma_io);
pci_iounmap(dev, priv-&gt;io);

…
}

priv is netdev private data, but it is used
after free_netdev(). It can cause use-after-free when accessing priv
pointer. So, fix it by moving free_netdev() after pci_iounmap()
calls.

Affected configurations

Vulners

Node

linuxlinux_kernelRange3.15–4.4.274

linuxlinux_kernelRange4.5.0–4.9.274

linuxlinux_kernelRange4.10.0–4.14.238

linuxlinux_kernelRange4.15.0–4.19.196

linuxlinux_kernelRange4.20.0–5.4.128

linuxlinux_kernelRange5.5.0–5.10.46

linuxlinux_kernelRange5.11.0–5.12.13

linuxlinux_kernelRange5.13.0≥

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/ethernet/ec_bhf.c"
    ],
    "versions": [
      {
        "version": "6af55ff52b02",
        "lessThan": "db2bc3cfd2bc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6af55ff52b02",
        "lessThan": "1cafc540b7bf",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6af55ff52b02",
        "lessThan": "b1ad28375509",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6af55ff52b02",
        "lessThan": "0260916843cc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6af55ff52b02",
        "lessThan": "19f88ca68ccf",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6af55ff52b02",
        "lessThan": "95deeb29d831",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6af55ff52b02",
        "lessThan": "d11d79e52ba0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6af55ff52b02",
        "lessThan": "9cca0c2d7014",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/ethernet/ec_bhf.c"
    ],
    "versions": [
      {
        "version": "3.15",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "3.15",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.4.274",
        "lessThanOrEqual": "4.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.9.274",
        "lessThanOrEqual": "4.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.238",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.196",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.128",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.46",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.12.13",
        "lessThanOrEqual": "5.12.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.13",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]