CVE-2021-34866

highpriority · track · 31EPSS 0.010 · 62 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.97% (62nd) EPSS

CVSS 7.2 · high

Is it mine?

20 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.07.2highAV:L/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 3.9 · impact 10

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.08.8highCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · ENISA EU

v3.08.8highCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · zdi-disclosures@trendmicro.comexploitability 2 · impact 6

v3.17.8highAV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-843USprimaryCWE-697USCWE-843US

affected products (20)

Products and version ranges known to be affected.

Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Linux Kernel≤ 5.14-rc3enisa_euvdEU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 4.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.6 «Смоленск»fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 10fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 11fstec_bduRU
Сообщество свободного программного обеспечения Linux5.11 → 5.13.13fstec_bduRU
Сообщество свободного программного обеспечения Linux5.8 → 5.10.61fstec_bduRU
linux linux kernel5.11 → 5.13.14nvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux kernel5.8 → 5.10.62nvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
netapp h300e firmwareall versionsnvdUScpe:2.3:o:netapp:h300e_firmware:*:*:*:*:*:*:*:*
netapp h300s firmwareall versionsnvdUScpe:2.3:o:netapp:h300s_firmware:*:*:*:*:*:*:*:*
netapp h410c firmwareall versionsnvdUScpe:2.3:o:netapp:h410c_firmware:*:*:*:*:*:*:*:*
netapp h410s firmwareall versionsnvdUScpe:2.3:o:netapp:h410s_firmware:*:*:*:*:*:*:*:*
netapp h500e firmwareall versionsnvdUScpe:2.3:o:netapp:h500e_firmware:*:*:*:*:*:*:*:*
netapp h500s firmwareall versionsnvdUScpe:2.3:o:netapp:h500s_firmware:*:*:*:*:*:*:*:*
netapp h700e firmwareall versionsnvdUScpe:2.3:o:netapp:h700e_firmware:*:*:*:*:*:*:*:*
netapp h700s firmwareall versionsnvdUScpe:2.3:o:netapp:h700s_firmware:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-0314Linux Kernel: Schwachstelle ermöglicht PrivilegieneskalationDeutsch2021-10-13csaf · cert_bundDE
Ein lokaler Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um seine Privilegien zu erhöhen.
PUB-A-2173073702022-04-01vendor · osvUS
In check_map_func_compatibility of verifier.c, there is a possible way to escalate privileges due to type confusion. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.

also known as (7)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv cert_bund nvd NVD CVE.org MITRE

published 2022-01-25modified 2026-06-17

related (1,197)

Related entries.

ID	severity	EPSS	exploitable	published
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Type confusion in V8 in Google Chrome prior to 152.0.7977.82 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security seve…
CVE-2026-21519US	—OT critical	2.48% (84th)	KEV	2026-02-10
Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
CVE-2025-13223US	—OT critical	4.90% (92nd)	KEV	2025-11-17
Type Confusion in V8 in Google Chrome prior to 142.0.7444.175 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity:…
CVE-2025-10585US	critical9.8OT critical	8.97% (95th)	KEV	2025-09-24
Type confusion in V8 in Google Chrome prior to 140.0.7339.185 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity:…
CVE-2025-6554US	—OT critical	14.1% (97th)	KEV	2025-06-30
Type confusion in V8 in Google Chrome prior to 138.0.7204.96 allowed a remote attacker to perform arbitrary read/write via a crafted HTML page. (Chromium security severity: High)

+1192 more

references (16)

External citations — patches, advisories, analysis.

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