CVE-2022-2503

2022-08-1211:15:07

CWE-302

CWE-287

Google

web.nvd.nist.gov

142

cve-2022-2503

dm-verity

loadpin

root-of-trust

kernel modules

firmware

vulnerability

arbitrary execution

nvd

CVSS3

6.9

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N

AI Score

7.3

Confidence

High

EPSS

0.001

Percentile

17.8%

JSON

Dm-verity is used for extending root-of-trust to root filesystems. LoadPin builds on this property to restrict module/firmware loads to just the trusted root filesystem. Device-mapper table reloads currently allow users with root privileges to switch out the target with an equivalent dm-linear target and bypass verification till reboot. This allows root to bypass LoadPin and can be used to load untrusted and unverified kernel modules and firmware, which implies arbitrary kernel execution and persistence for peripherals that do not verify firmware updates. We recommend upgrading past commit 4caae58406f8ceb741603eee460d79bacca9b1b5

Affected configurations

Nvd

Node

linuxlinux_kernelRange<5.19

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 Kernel",
    "product": "Linux Kernel",
    "versions": [
      {
        "version": "unspecified",
        "lessThan": "4caae58406f8ceb741603eee460d79bacca9b1b5",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]