CVE-2021-47021 mt76: mt7915: fix memleak when mt7915_unregister_device()

What is CVE-2021-47021?

CVE-2021-47021 is a medium-severity denial of service vulnerability in Linux kernel, published on 28 Feb 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

mt76: mt7915: fix memleak when mt7915_unregister_device()

mt7915_tx_token_put() should get call before mt76_free_pending_txwi().

Weakness: CWE-401

Which versions are affected by CVE-2021-47021?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47021?

No fix has been published for CVE-2021-47021 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-47021 being exploited?

There is no known exploitation of CVE-2021-47021 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-88w2-c8v7-h7p6, UBUNTU-CVE-2021-47021.