CVE-2021-47075 nvmet: fix memory leak in nvmet_alloc_ctrl()

What is CVE-2021-47075?

CVE-2021-47075 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

nvmet: fix memory leak in nvmet_alloc_ctrl()

When creating ctrl in nvmet_alloc_ctrl(), if the cntlid_min is larger than cntlid_max of the subsystem, and jumps to the "out_free_changed_ns_list" label, but the ctrl->sqs lack of be freed. Fix this by jumping to the "out_free_sqs" label.

Weakness: CWE-401

Which versions are affected by CVE-2021-47075?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47075?

Apply the vendor's patch.

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-2021-47075 being exploited?

There is no known exploitation of CVE-2021-47075 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 DEBIAN-CVE-2021-47075, GHSA-f5x9-85f3-f3r4, UBUNTU-CVE-2021-47075.