What is CVE-2021-36148?

CVE-2021-36148 is a high-severity vulnerability in Linux Acrn, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2021-07-02.

How severe is CVE-2021-36148?

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

Buffer overflow in Linux Acrn

CVE-2021-36148

An issue was discovered in ACRN before 2.5. dmar_free_irte in hypervisor/arch/x86/vtd.c allows an irte_alloc_bitmap buffer overflow.

Vulnerability class: Buffer Overflow

Published 2021-07-02 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.007 (49.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Linux Acrn

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/projectacrn/acrn-hypervisor/commit/25c0e3817eb332660dd63d1d4522e63dc… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-36148?: CVE-2021-36148 is a high-severity vulnerability in Linux Acrn, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2021-07-02.
How severe is CVE-2021-36148?: High severity. CVSS v3 base score is 7.8 out of 10.