Is CVE-2021-34866 in the CISA KEV catalog?

No. CVE-2021-34866 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-34866?

CVE-2021-34866 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-34866?

CVE-2021-34866 has an EPSS score of 0.97% (58th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-34866?

Upgrade linux on debian 11 to 5.10.70-1 or later. Fixes are available for 69 affected products.

CVE & CISA-KEV Catalog

CVE-2021-34866

HIGH

7.8

CVSS v3

NVD

Description

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.

CWE-843Type Confusion

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.70-1CVE-2021-34866

Fixed in:5.14.6-1CVE-2021-34866

bpftoolRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

bpftoolRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

bpftool-debuginfoRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

bpftool-debuginfoRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernelRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernelRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-abi-stablelistsRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-abi-stablelistsRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-coreRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-coreRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debugRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debugRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-coreRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-coreRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-debuginfoRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-debuginfoRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-develRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-develRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-modulesRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-modulesRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-modules-extraRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debug-modules-extraRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfoRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfoRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfo-common-aarch64Rocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfo-common-aarch64Red Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfo-common-ppc64leRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfo-common-ppc64leRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfo-common-s390xRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfo-common-s390xRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfo-common-x86_64Rocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-debuginfo-common-x86_64Red Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-develRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-develRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-docRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-docRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-modulesRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-modulesRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-modules-extraRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-modules-extraRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-toolsRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-toolsRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-tools-debuginfoRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-tools-debuginfoRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-tools-libsRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-tools-libsRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-tools-libs-develRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-tools-libs-develRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdumpRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdumpRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-coreRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-coreRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-debuginfoRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-debuginfoRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-develRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-develRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-modulesRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-modulesRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-modules-extraRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

kernel-zfcpdump-modules-extraRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

perfRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

perfRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

perf-debuginfoRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

perf-debuginfoRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

python3-perfRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

python3-perfRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

python3-perf-debuginfoRed Hat / RHEL

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

python3-perf-debuginfoRocky

Fixed in:0:4.18.0-372.91.1.el8_6RHSA-2024:0724

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.97%probability of exploitation in 30 days

58thpercentile

Moderate risk: more likely to be exploited than 58% of all known CVEs.

References

Third-Party Advisory2

Related Vulnerabilities

Other CWE-843 (Type Confusion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2011-0611	High	8.8	99%	KEV	Fix
CVE-2012-0507	Critical	9.8	98%	KEV + Ransom	-
CVE-2017-8291	High	7.8	97%	KEV	Fix
CVE-2019-0752	High	7.5	82%	KEV + Ransom	-
CVE-2017-0037	High	8.1	80%	KEV	-
CVE-2016-7201	High	8.8	80%	KEV	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.