What is CVE-2021-47087?

CVE-2021-47087 is a high-severity vulnerability in Linux, classified under Release of Invalid Pointer or Reference. CVSS score: 7.8/10. Published 2024-03-04.

How severe is CVE-2021-47087?

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

Vulnerability in Linux

CVE-2021-47087

In the Linux kernel, the following vulnerability has been resolved: tee: optee: Fix incorrect page free bug Pointer to the allocated pages (struct page *page) has already progressed towards the end of allocation. It is incorrect to perform __free_pages(page, order) using this pointer as we would free any arbitrary pages. Fix this by stop modifying the page pointer.

Published 2024-03-04 · last modified 2026-08-04.

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: 0.002 (13.6th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Linux — versions 5.4.169, 0, 5.10.58
Linux Kernel — versions 5.16

Weakness classification (CWE)

CWE-763 — Release of Invalid Pointer or Reference

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2021-47087?: CVE-2021-47087 is a high-severity vulnerability in Linux, classified under Release of Invalid Pointer or Reference. CVSS score: 7.8/10. Published 2024-03-04.
How severe is CVE-2021-47087?: High severity. CVSS v3 base score is 7.8 out of 10.