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CanonicalCVE-2021-3492

HistoryApr 17, 2021 - 5:15 a.m.

CVE-2021-3492

2021-04-1705:15:13

CWE-401

CWE-415

canonical

web.nvd.nist.gov

237

cve-2021-3492

shiftfs

ubuntu linux

kernel

memory exhaustion

privilege escalation

zdi-can-13562

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

8.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

7.5

Confidence

High

EPSS

0.001

Percentile

17.9%

JSON

Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.

Affected configurations

Nvd

Node

canonicalubuntu_linuxRange<18.04lts

canonicalubuntu_linuxRange18.04.1–20.04lts

Node

canonicalubuntu_linuxRange<20.10-

VendorProductVersionCPE
canonicalubuntu_linux*cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:*
canonicalubuntu_linux*cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:-:*:*:*

Vendor	Product	Version	CPE
canonical	ubuntu_linux	*	cpe:2.3:o:canonical:ubuntu_linux:::::lts:::*
canonical	ubuntu_linux	*	cpe:2.3:o:canonical:ubuntu_linux:::::-:::*

CNA Affected

[
  {
    "product": "Linux kernel",
    "vendor": "Ubuntu",
    "versions": [
      {
        "lessThan": "5.8.0-50.56",
        "status": "affected",
        "version": "5.8 kernel",
        "versionType": "custom"
      },
      {
        "lessThan": "5.4.0-72.80",
        "status": "affected",
        "version": "5.4 kernel",
        "versionType": "custom"
      }
    ]
  }
]