CVE-2021-47401 ipack: ipoctal: fix stack information leak

What is CVE-2021-47401?

CVE-2021-47401 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 stack information leak

The tty driver name is used also after registering the driver and must specifically not be allocated on the stack to avoid leaking information to user space (or triggering an oops).

Drivers should not try to encode topology information in the tty device name but this one snuck in through staging without anyone noticing and another driver has since copied this malpractice.

Fixing the ABI is a separate issue, but this at least plugs the security hole.

Weakness: CWE-668

Which versions are affected by CVE-2021-47401?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47401?

Apply the vendor's patch.

Is CVE-2021-47401 being exploited?

There is no known exploitation of CVE-2021-47401 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-2021-47401, GHSA-c227-q7j7-xf88, UBUNTU-CVE-2021-47401.