7.8

CVE-2021-47087: tee: optee: Fix incorrect page free bug

Modified
AliasesUBUNTU-CVE-2021-47087DEBIAN-CVE-2021-47087
Published 04-03-2024Last modified 05-08-2026

Vulnerability summary

CVE-2021-47087 is a high (CVSS 7.8) Release of Invalid Pointer or Reference vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7 · Related 7
SUSE-SU-2024:1320-1SUSE-SU-2024:1321-1SUSE-SU-2024:1465-1SUSE-SU-2024:1466-1SUSE-SU-2024:1480-1SUSE-SU-2024:1489-1

Timeline

  1. 04-03-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu81 products
  • linux< 5.4.0-105.119
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1069.73
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 3c712f14d8a9354a8807c15c64c8dd334499cc42, < 806142c805cacd098e61bdc0f72c778a2389fe4a | ≥ 1340dc3fb75ea69221f4f5dcb0cbace55ad0331c, < ad338d825e3f7b96ee542bf313728af2d19fe9ad | ≥ ec185dd3ab257dc2a60953fdf1b6622f524cc5b7, < 91e94e42f6fc49635f1a16d8ae3f79552bcfda29 | ≥ ec185dd3ab257dc2a60953fdf1b6622f524cc5b7, < 18549bf4b21c739a9def39f27dcac53e27286ab5 | 255e17923b22cb7abd026e044416d61f6bd0eec0 | ≥ 5.4.140, < 5.4.169 | ≥ 5.10.58, < 5.10.89 | ≥ 5.13.10, < 5.14 | 5.14
  • linux_kernel≥ 5.4.140, < 5.4.169 | ≥ 5.10.58, < 5.10.89 | ≥ 5.14, < 5.15.12 | 5.16:rc1 | 5.16:rc2 | 5.16:rc3 | 5.16:rc4 | 5.16:rc5 | 5.16:rc6
Debian1 product
  • linux< 5.15.15-1

3 vendors · 84 products

References

8 links