What’s Vulnerable › Vulnerabilities

CVE-2021-47134: efi/fdt: fix panic when no valid fdt found

• 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: 2024-03-15 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: efi/fdt: fix panic when no valid fdt found setup_arch() would invoke efi_init()->efi_get_fdt_params(). If no valid fdt found then initial_boot_params will be null. So we should stop further fdt processing here. I encountered this issue on risc-v.

Affected products

• Linux kernel: from 5.10 before 5.10.43; from 5.11 before 5.12.10; 5.13-rc1, 5.13-rc2, 5.13-rc3, 5.13-rc4 — fixed in 5.10.43, 5.12.10

How to fix

Upgrade to a fixed version: Linux kernel 5.10.43, 5.12.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/5148066edbdc89c6fe5bc419c31a5c22e5f83bdb
• https://git.kernel.org/stable/c/668a84c1bfb2b3fd5a10847825a854d63fac7baa
• https://git.kernel.org/stable/c/8a7e8b4e5631a03ea2fee27957857a56612108ca
• https://git.kernel.org/stable/c/5148066edbdc89c6fe5bc419c31a5c22e5f83bdb
• https://git.kernel.org/stable/c/668a84c1bfb2b3fd5a10847825a854d63fac7baa
• https://git.kernel.org/stable/c/8a7e8b4e5631a03ea2fee27957857a56612108ca

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