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CVE-2021-47009: KEYS: trusted: Fix memory leak on object td

• Severity: medium (CVSS 5.5 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: 2024-02-28 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: KEYS: trusted: Fix memory leak on object td Two error return paths are neglecting to free allocated object td, causing a memory leak. Fix this by returning via the error return path that securely kfree's td. Fixes clang scan-build warning: security/keys/trusted-keys/trusted_tpm1.c:496:10: warning: Potential memory leak [unix.Malloc]

Affected products

• Linux kernel: from 5.10.20 before 5.10.38; from 5.11.3 before 5.11.22; from 5.12 before 5.12.5; 5.12-rc1 — fixed in 5.10.38, 5.11.22, 5.12.5

How to fix

Upgrade to a fixed version: Linux kernel 5.10.38, 5.11.22, 5.12.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1c4031014106aff48e1e686e40101c31eab5d44c
• https://git.kernel.org/stable/c/31c9a4b24d86cbb36ff0d7a085725a3b4f0138c8
• https://git.kernel.org/stable/c/3e24fbd37e72e8a67b74991970fecc82d14f57af
• https://git.kernel.org/stable/c/83a775d5f9bfda95b1c295f95a3a041a40c7f321
• https://git.kernel.org/stable/c/1c4031014106aff48e1e686e40101c31eab5d44c
• https://git.kernel.org/stable/c/31c9a4b24d86cbb36ff0d7a085725a3b4f0138c8
• https://git.kernel.org/stable/c/3e24fbd37e72e8a67b74991970fecc82d14f57af
• https://git.kernel.org/stable/c/83a775d5f9bfda95b1c295f95a3a041a40c7f321

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