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Vulnerability record · CVE-2021-41864 · published 2 October 2021

CVE-2021-41864: Linux kernel integer overflow vulnerability

Linux · Linux Kernel

prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the Linux kernel before 5.14.12 allows unprivileged users to trigger an eBPF multiplication integer overflow with a resultant out-of-bounds write.

7.8 CVSS 3.1 High EPSS 0.41% · top 67.5% CWE-190 · Integer overflow
7.8CVSS 3.1 base score, v2 4.6
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
15Affected product versions listed by NVD
20References
5 Aug 2026Last modified by NVD

Description

prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the Linux kernel before 5.14.12 allows unprivileged users to trigger an eBPF multiplication integer overflow with a resultant out-of-bounds write.

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

Affected products

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

References

LinkTags
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.12 Mailing ListPatchVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=30e29a9a2bc6a4888335a6ede968b75cd329657a Mailing ListPatchVendor Advisory
https://github.com/torvalds/linux/commit/30e29a9a2bc6a4888335a6ede968b75cd329657a PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7BLLVKYAIETEORUPTFO3TR3 Broken Link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LAT3RERO6QBKSPJBNNRWY3D Broken Link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SYKURLXBB2555ASWMPDNMBU Broken Link
https://security.netapp.com/advisory/ntap-20211029-0004/ Third Party Advisory
https://www.debian.org/security/2022/dsa-5096 Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.12 Mailing ListPatchVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=30e29a9a2bc6a4888335a6ede968b75cd329657a Mailing ListPatchVendor Advisory
https://github.com/torvalds/linux/commit/30e29a9a2bc6a4888335a6ede968b75cd329657a PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7BLLVKYAIETEORUPTFO3TR3 Broken Link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LAT3RERO6QBKSPJBNNRWY3D Broken Link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SYKURLXBB2555ASWMPDNMBU Broken Link
https://security.netapp.com/advisory/ntap-20211029-0004/ Third Party Advisory
https://www.debian.org/security/2022/dsa-5096 Third Party Advisory

Track CVE-2021-41864 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2021-41864), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.