CVE-2021-47403 ipack: ipoctal: fix module reference leak

What is CVE-2021-47403?

CVE-2021-47403 is a high-severity vulnerability in Linux kernel, published on 21 May 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:

ipack: ipoctal: fix module reference leak

A reference to the carrier module was taken on every open but was only released once when the final reference to the tty struct was dropped.

Fix this by taking the module reference and initialising the tty driver data when installing the tty.

Weakness: CWE-200

Which versions are affected by CVE-2021-47403?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47403?

Apply the vendor's patch.

Is CVE-2021-47403 being exploited?

There is no known exploitation of CVE-2021-47403 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-2021-47403, GHSA-jmm7-6r74-7f4p, UBUNTU-CVE-2021-47403.