What is CVE-2021-29266?

CVE-2021-29266 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2021-03-26.

How severe is CVE-2021-29266?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Linux Kernel

CVE-2021-29266

An issue was discovered in the Linux kernel before 5.11.9. drivers/vhost/vdpa.c has a use-after-free because v->config_ctx has an invalid value upon re-opening a character device, aka CID-f6bbf0010ba0.

Vulnerability class: Use-After-Free

Published 2021-03-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (22.6th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Linux Kernel

Weakness classification (CWE)

CWE-416 — Use After Free

References

git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/ (Patch, Vendor Advisory)
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.9 (Release Notes, Vendor Advisory)
security.netapp.com/advisory/ntap-20210513-0005/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-29266?: CVE-2021-29266 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2021-03-26.
How severe is CVE-2021-29266?: High severity. CVSS v3 base score is 7.8 out of 10.