CVE-2021-38166

In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without the CAP_SYS_ADMIN capability.

Score

CVSS 3.1 7.8 High

Status

Analyzed - cve@mitre.org

Published

2021-08-07

Last modified

2026-10-08

Weaknesses

CWE-190, CWE-787

Affected products

• Debian Linux (Debian)
• Fedora (Fedoraproject)
• Linux Kernel (Linux)

References

• https://lore.kernel.org/bpf/20210806150419.109658-1-th.yasumatsu%40gmail.com/
• https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=c4eb1f403243fc7bbb7de644db8587c03de36da6
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUVLBJKZMWA3E3YXSH4SZ7…
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UL6CH5M5PRLMA3KPBX4LPU…
• https://security.netapp.com/advisory/ntap-20210909-0001/
• https://www.debian.org/security/2021/dsa-4978