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[email protected]CVE-2021-3444

HistoryMar 23, 2021 - 6:15 p.m.

CVE-2021-3444

2021-03-2318:15:13

CWE-681

CWE-125

[email protected]

web.nvd.nist.gov

272

cve-2021-3444

linux kernel

bpf verifier

vulnerability

out-of-bounds read

code execution

information disclosure

nvd

security advisory

4.6 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

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

9.9%

JSON

The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 (“bpf: Fix truncation handling for mod32 dst reg wrt zero”) and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.

Affected configurations

NVD

Node

linuxlinux_kernelRange<5.4.101

linuxlinux_kernelRange5.5.0–5.10.19

linuxlinux_kernelRange5.11–5.11.2

Node

debiandebian_linuxMatch9.0

Node

canonicalubuntu_linuxMatch14.04esm

canonicalubuntu_linuxMatch16.04lts

canonicalubuntu_linuxMatch18.04lts

canonicalubuntu_linuxMatch20.04lts

CPENameOperatorVersion
linux:linux_kernellinux linux kernellt5.4.101
linux:linux_kernellinux linux kernellt5.10.19
linux:linux_kernellinux linux kernellt5.11.2

CPE	Name	Operator	Version
linux:linux_kernel	linux linux kernel	lt	5.4.101
linux:linux_kernel	linux linux kernel	lt	5.10.19
linux:linux_kernel	linux linux kernel	lt	5.11.2

CNA Affected

[
  {
    "product": "kernel",
    "vendor": "Linux",
    "versions": [
      {
        "lessThan": "5.12-rc1",
        "status": "affected",
        "version": "trunk",
        "versionType": "custom"
      },
      {
        "lessThan": "5.11.2",
        "status": "affected",
        "version": "5.11",
        "versionType": "custom"
      },
      {
        "lessThan": "5.10.19",
        "status": "affected",
        "version": "5.10",
        "versionType": "custom"
      },
      {
        "lessThan": "5.4.101",
        "status": "affected",
        "version": "5.4",
        "versionType": "custom"
      }
    ]
  }
]