CVE-2021-34866

Published on: 01/25/2022 12:00:00 AM UTC

Last Modified on: 03/29/2022 04:35:00 PM UTC

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Certain versions of Linux Kernel from Linux contain the following vulnerability:

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.14-rc3. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs, which can result in a type confusion condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-14689.

  • CVE-2021-34866 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • Affected Vendor/Software: URL Logo Linux - Kernel version 5.14-rc3

CVSS3 Score: 7.8 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
LOCAL LOW LOW NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED HIGH HIGH HIGH

CVSS2 Score: 7.2 - HIGH

Access
Vector
Access
Complexity
Authentication
LOCAL LOW NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
COMPLETE COMPLETE COMPLETE

CVE References

Description Tags Link
CVE-2021-34866 Linux Kernel Vulnerability in NetApp Products | NetApp Product Security security.netapp.com
text/html
URL Logo CONFIRM security.netapp.com/advisory/ntap-20220217-0008/
ZDI-21-1148 | Zero Day Initiative www.zerodayinitiative.com
text/html
URL Logo MISC www.zerodayinitiative.com/advisories/ZDI-21-1148/

Related QID Numbers

  • 180208 Debian Security Update for linux (CVE-2021-34866)
  • 610406 Google Pixel Android April 2022 Security Patch Missing
  • 751342 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3641-1)
  • 751346 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3655-1)
  • 751353 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3675-1)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
Operating
System
LinuxLinux Kernel5.14rc3AllAll
HardwareNetappH300e-AllAllAll
Operating
System
NetappH300e Firmware-AllAllAll
HardwareNetappH300s-AllAllAll
Operating
System
NetappH300s Firmware-AllAllAll
HardwareNetappH410c-AllAllAll
Operating
System
NetappH410c Firmware-AllAllAll
HardwareNetappH410s-AllAllAll
Operating
System
NetappH410s Firmware-AllAllAll
HardwareNetappH500e-AllAllAll
Operating
System
NetappH500e Firmware-AllAllAll
HardwareNetappH500s-AllAllAll
Operating
System
NetappH500s Firmware-AllAllAll
HardwareNetappH700e-AllAllAll
Operating
System
NetappH700e Firmware-AllAllAll
HardwareNetappH700s-AllAllAll
Operating
System
NetappH700s Firmware-AllAllAll
  • cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:*:
  • cpe:2.3:h:netapp:h300e:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:netapp:h410c:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:netapp:h500e:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:netapp:h700e:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*:
  • cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*:

Discovery Credit

Ryota Shiga(@Ga_ryo_) of Flatt Security

Social Mentions

Source Title Posted (UTC)
Twitter Icon @flatt_security セキュリティエンジニアの志賀(@Ga_ryo_)が「脆弱性リサーチプロジェクト」において報告した脆弱性が2つ公開されました。 1. CVE-2021-34866 Linux Kernel eBPF Type Confusion… twitter.com/i/web/status/1… 2021-10-29 05:54:21
Twitter Icon @ipssignatures The vuln CVE-2021-34866 has a tweet created 0 days ago and retweeted 10 times. twitter.com/flatt_security… #pow1rtrtwwcve 2021-10-29 14:06:00
Twitter Icon @vulmoncom Linux Kernel eBPF Type Confusion Privilege Escalation vulmon.com/vulnerabilityd… CVE-2021-34866 #Vulmon #Linux #InfoSec #CyberSecurity 2021-10-30 08:02:20
Twitter Icon @h3xr4bb1t Here's my PoC exploit for CVE-2021-34866 :) blog.hexrabbit.io/2021/11/03/CVE… 2021-11-03 09:32:40
Twitter Icon @ipssignatures The vuln CVE-2021-34866 has a tweet created 0 days ago and retweeted 10 times. twitter.com/h3xr4bb1t/stat… #pow1rtrtwwcve 2021-11-03 12:06:00
Twitter Icon @linkersec CVE-2021-34866 Writeup; by @h3xr4bb1t An article covering exploitation of a type confusion in the eBPF subsystem.… twitter.com/i/web/status/1… 2021-11-06 01:51:24
Twitter Icon @seebug_team @h3xr4bb1t 您好,我们是Seebug漏洞平台,看到您博客的文章《CVE-2021-34866 Writeup》很不错,请问能否授权转载至Seebug Paper栏目(paper.seebug.org),我们会在文首注明作者和来源~? 2021-11-08 08:38:21
Twitter Icon @ipssignatures The vuln CVE-2021-34866 has a tweet created 5 days ago and retweeted 100 times. twitter.com/h3xr4bb1t/stat… #pow2rtrtwwcve 2021-11-09 00:06:01
Reddit Logo Icon /r/vulnintel Linux Kernel eBPF Type Confusion Privilege Escalation CVE-2021-34866 2021-10-30 08:02:43
Reddit Logo Icon /r/linkersec CVE-2021-34866 Writeup 2021-11-06 01:52:06
Reddit Logo Icon /r/netcve CVE-2021-34866 2022-01-25 16:38:55
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