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416baaa9-dc9f-4396-8d5f-8c081fb06d67CVE-2021-47520

HistoryMay 24, 2024 - 3:15 p.m.

CVE-2021-47520

2024-05-2415:15:14

CWE-416

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

web.nvd.nist.gov

linux

kernel

vulnerability

fix

can_frame

use after free

nvd

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

6.8 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%

JSON

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

can: pch_can: pch_can_rx_normal: fix use after free

After calling netif_receive_skb(skb), dereferencing skb is unsafe.
Especially, the can_frame cf which aliases skb memory is dereferenced
just after the call netif_receive_skb(skb).

Reordering the lines solves the issue.

Affected configurations

Vulners

NVD

Node

linuxlinux_kernelRange2.6.37–4.4.295

linuxlinux_kernelRange4.5.0–4.9.293

linuxlinux_kernelRange4.10.0–4.14.258

linuxlinux_kernelRange4.15.0–4.19.221

linuxlinux_kernelRange4.20.0–5.4.165

linuxlinux_kernelRange5.5.0–5.10.85

linuxlinux_kernelRange5.11.0–5.15.8

linuxlinux_kernelRange5.16.0≥

CPENameOperatorVersion
linux:linux_kernellinux linux kernellt4.4.295
linux:linux_kernellinux linux kernellt4.9.293
linux:linux_kernellinux linux kernellt4.14.258
linux:linux_kernellinux linux kernellt4.19.221
linux:linux_kernellinux linux kernellt5.4.165
linux:linux_kernellinux linux kernellt5.10.85
linux:linux_kernellinux linux kernellt5.15.8

CPE	Name	Operator	Version
linux:linux_kernel	linux linux kernel	lt	4.4.295
linux:linux_kernel	linux linux kernel	lt	4.9.293
linux:linux_kernel	linux linux kernel	lt	4.14.258
linux:linux_kernel	linux linux kernel	lt	4.19.221
linux:linux_kernel	linux linux kernel	lt	5.4.165
linux:linux_kernel	linux linux kernel	lt	5.10.85
linux:linux_kernel	linux linux kernel	lt	5.15.8

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/can/pch_can.c"
    ],
    "versions": [
      {
        "version": "b21d18b51b31",
        "lessThan": "bafe343a885c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b21d18b51b31",
        "lessThan": "3a3c46e2eff0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b21d18b51b31",
        "lessThan": "affbad02bf80",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b21d18b51b31",
        "lessThan": "3e193ef4e0a3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b21d18b51b31",
        "lessThan": "abb4eff3dcd2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b21d18b51b31",
        "lessThan": "703dde112021",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b21d18b51b31",
        "lessThan": "6c73fc931658",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b21d18b51b31",
        "lessThan": "94cddf1e9227",
        "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/can/pch_can.c"
    ],
    "versions": [
      {
        "version": "2.6.37",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.37",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.4.295",
        "lessThanOrEqual": "4.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.9.293",
        "lessThanOrEqual": "4.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.258",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.221",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.165",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.85",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.8",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]