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LinuxCVE-2021-47520

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

CVE-2021-47520

2024-05-2415:15:14

CWE-416

Linux

web.nvd.nist.gov

linux

kernel

vulnerability

fix

can_frame

use after free

nvd

CVSS3

7.8

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

AI Score

6.8

Confidence

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

Nvd

Vulners

Node

linuxlinux_kernelRange2.6.37–4.4.295

linuxlinux_kernelRange4.5–4.9.293

linuxlinux_kernelRange4.10–4.14.258

linuxlinux_kernelRange4.15–4.19.221

linuxlinux_kernelRange4.20–5.4.165

linuxlinux_kernelRange5.5–5.10.85

linuxlinux_kernelRange5.11–5.15.8

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::

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"
      }
    ]
  }
]