CVE-2023-1829 Use-after-free in tcindex (traffic control index filter) in the Linux Kernel

2023-04-1211:16:59

CWE-416

Google

www.cve.org

cve-2023-1829

traffic control index filter

local privilege escalation

perfect hashes

double freeing

commit 8c710f75256bb3cf05ac7b1672c82b92c43f3d28

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

7.9 High

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

17.1%

JSON

A use-after-free vulnerability in the Linux Kernel traffic control index filter (tcindex) can be exploited to achieve local privilege escalation. The tcindex_delete function which does not properly deactivate filters in case of a perfect hashes while deleting the underlying structure which can later lead to double freeing the structure. A local attacker user can use this vulnerability to elevate its privileges to root.
We recommend upgrading past commit 8c710f75256bb3cf05ac7b1672c82b92c43f3d28.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "packageName": "kernel",
    "product": "Linux Kernel",
    "repo": "https://git.kernel.org",
    "vendor": "Linux",
    "versions": [
      {
        "lessThanOrEqual": "6.2",
        "status": "affected",
        "version": "3.8",
        "versionType": "custom"
      }
    ]
  }
]