CVE-2023-2236 Use-after-free in Linux kernel's Performance Events subsystem

2023-05-0112:50:47

CWE-416

Google

www.cve.org

linux kernel

performance events

use-after-free

vulnerability

local privilege escalation

io_uring

subsystem

reference underflow

upgrade

commit 9d94c04c0db024922e886c9fd429659f22f48ea4

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

0.0004 Low

EPSS

Percentile

5.1%

JSON

A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation.

Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability.

We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "packageName": "kernel",
    "product": "Linux Kernel",
    "repo": "https://git.kernel.org",
    "vendor": "Linux",
    "versions": [
      {
        "lessThan": "6.1",
        "status": "affected",
        "version": "5.19",
        "versionType": "custom"
      }
    ]
  }
]