What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-04 · updated 2026-08-04
• Weakness: CWE-763

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.

Affected products

• Linux kernel: from 5.4.140 before 5.4.169; from 5.10.58 before 5.10.89; from 5.14 before 5.15.12; 5.16-rc1, 5.16-rc2, 5.16-rc3, 5.16-rc4, 5.16-rc5, 5.16-rc6 — fixed in 5.10.89, 5.15.12, 5.4.169

How to fix

Upgrade to a fixed version: Linux kernel 5.10.89, 5.15.12, 5.4.169. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/18549bf4b21c739a9def39f27dcac53e27286ab5
• https://git.kernel.org/stable/c/806142c805cacd098e61bdc0f72c778a2389fe4a
• https://git.kernel.org/stable/c/91e94e42f6fc49635f1a16d8ae3f79552bcfda29
• https://git.kernel.org/stable/c/ad338d825e3f7b96ee542bf313728af2d19fe9ad
• https://git.kernel.org/stable/c/18549bf4b21c739a9def39f27dcac53e27286ab5
• https://git.kernel.org/stable/c/806142c805cacd098e61bdc0f72c778a2389fe4a
• https://git.kernel.org/stable/c/91e94e42f6fc49635f1a16d8ae3f79552bcfda29
• https://git.kernel.org/stable/c/ad338d825e3f7b96ee542bf313728af2d19fe9ad

Get alerted when CVE-2021-47087 or the next vulnerability affects your stack