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GoogleCVE-2023-4207

HistorySep 06, 2023 - 2:15 p.m.

CVE-2023-4207

2023-09-0614:15:11

CWE-416

Google

web.nvd.nist.gov

186

linux kernel

net/sched

cls_fw

use-after-free vulnerability

local privilege escalation

cve-2023-4207

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

7.4

Confidence

High

EPSS

Percentile

5.1%

JSON

A use-after-free vulnerability in the Linux kernel’s net/sched: cls_fw component can be exploited to achieve local privilege escalation.

When fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.

Affected configurations

Nvd

Vulners

Node

linuxlinux_kernelRange3.18–4.14.326

linuxlinux_kernelRange4.15–4.19.295

linuxlinux_kernelRange4.20–5.4.253

linuxlinux_kernelRange5.5–5.10.190

linuxlinux_kernelRange5.11–5.15.126

linuxlinux_kernelRange5.16–6.1.45

linuxlinux_kernelRange6.2–6.4.10

Node

debiandebian_linuxMatch12.0

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

[
  {
    "vendor": "Linux",
    "product": "Kernel",
    "packageName": "kernel",
    "repo": "https://git.kernel.org",
    "versions": [
      {
        "status": "affected",
        "version": "3.18",
        "lessThan": "6.5",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  }
]