CVE-2022-4696

2023-01-1112:33:41

CWE-763

Google

github.com

linux kernel

use-after-free

ioring_op_splice

vulnerability

upgrade

version 5.10.160

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

6.7

Confidence

Low

EPSS

0.001

Percentile

17.7%

SSVC

Exploitation

none

Automatable

Technical Impact

total

JSON

There exists a use-after-free vulnerability in the Linux kernel through io_uring and the IORING_OP_SPLICE operation. If IORING_OP_SPLICE is missing the IO_WQ_WORK_FILES flag, which signals that the operation won’t use current->nsproxy, so its reference counter is not increased. This assumption is not always true as calling io_splice on specific files will call the get_uts function which will use current->nsproxy leading to invalidly decreasing its reference counter later causing the use-after-free vulnerability. We recommend upgrading to version 5.10.160 or above

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "affected",
        "version": "5.7-rc1",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.159"
      }
    ],
    "defaultStatus": "unknown"
  }
]