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Vulnerability record · CVE-2021-31440 · published 21 May 2021

CVE-2021-31440: Linux kernel vulnerability

Linux · Linux Kernel

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.11.15. 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 prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-13661.

7.0 CVSS 3.1 High EPSS 1.8% · top 23.0% CWE-682 · CWE-682
7.0CVSS 3.1 base score, v2 6.9
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
10Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.11.15. 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 prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-13661.

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

Affected products

10 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10bf4e83167cc68595b85fd73bb91e8f2c086e36 PatchVendor Advisory
https://security.netapp.com/advisory/ntap-20210706-0003/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-503/ Third Party AdvisoryVDB Entry
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10bf4e83167cc68595b85fd73bb91e8f2c086e36 PatchVendor Advisory
https://security.netapp.com/advisory/ntap-20210706-0003/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-503/ Third Party AdvisoryVDB Entry

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Source: NIST National Vulnerability Database (record CVE-2021-31440), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.