What’s Vulnerable › Vulnerabilities

CVE-2021-47064: mt76: fix potential DMA mapping leak

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-29 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: mt76: fix potential DMA mapping leak With buf uninitialized in mt76_dma_tx_queue_skb_raw, its field skip_unmap could potentially inherit a non-zero value from stack garbage. If this happens, it will cause DMA mappings for MCU command frames to not be unmapped after completion

Affected products

• Linux kernel: from 5.10 before 5.10.37; from 5.11 before 5.11.21; from 5.12 before 5.12.4 — fixed in 5.10.37, 5.11.21, 5.12.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.37, 5.11.21, 5.12.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/91b9548d413fda488ea853cd1b9f59b572db3a0c
• https://git.kernel.org/stable/c/9b68ce2856dadc0e1cb6fd21fbeb850da49efd08
• https://git.kernel.org/stable/c/9fa26701cd1fc4d932d431971efc5746325bdfce
• https://git.kernel.org/stable/c/b4403cee6400c5f679e9c4a82b91d61aa961eccf
• https://git.kernel.org/stable/c/91b9548d413fda488ea853cd1b9f59b572db3a0c
• https://git.kernel.org/stable/c/9b68ce2856dadc0e1cb6fd21fbeb850da49efd08
• https://git.kernel.org/stable/c/9fa26701cd1fc4d932d431971efc5746325bdfce
• https://git.kernel.org/stable/c/b4403cee6400c5f679e9c4a82b91d61aa961eccf

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