CVE-2021-47560

2024-05-2415:15:20

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

web.nvd.nist.gov

cve-2021-47560

linux kernel

vulnerability resolved

null pointer dereference

mlxsw: spectrum driver

buggy firmware

port events

cpu port

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.5%

JSON

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

mlxsw: spectrum: Protect driver from buggy firmware

When processing port up/down events generated by the device’s firmware,
the driver protects itself from events reported for non-existent local
ports, but not the CPU port (local port 0), which exists, but lacks a
netdev.

This can result in a NULL pointer dereference when calling
netif_carrier_{on,off}().

Fix this by bailing early when processing an event reported for the CPU
port. Problem was only observed when running on top of a buggy emulator.

Affected configurations

Vulners

Node

linuxlinux_kernelRange5.4–5.10.83

linuxlinux_kernelRange5.11.0–5.15.6

linuxlinux_kernelRange5.16.0≥

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/mellanox/mlxsw/spectrum.c"
    ],
    "versions": [
      {
        "version": "28b1987ef506",
        "lessThan": "90d0736876c5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "28b1987ef506",
        "lessThan": "da4d70199e5d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "28b1987ef506",
        "lessThan": "63b08b1f6834",
        "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/mellanox/mlxsw/spectrum.c"
    ],
    "versions": [
      {
        "version": "5.4",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.4",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.83",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.6",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]