CVE-2022-3176 Use-after-free in io_uring in Linux Kernel

2022-09-1600:00:00

CWE-416

Google

www.cve.org

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

7.7 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

14.3%

JSON

There exists a use-after-free in io_uring in the Linux kernel. Signalfd_poll() and binder_poll() use a waitqueue whose lifetime is the current task. It will send a POLLFREE notification to all waiters before the queue is freed. Unfortunately, the io_uring poll doesn’t handle POLLFREE. This allows a use-after-free to occur if a signalfd or binder fd is polled with io_uring poll, and the waitqueue gets freed. We recommend upgrading past commit fc78b2fc21f10c4c9c4d5d659a685710ffa63659

CNA Affected

[
  {
    "vendor": "Linux",
    "product": "Kernel",
    "versions": [
      {
        "version": "unspecified",
        "lessThan": "fc78b2fc21f10c4c9c4d5d659a685710ffa63659",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]