CVE-2021-47401

MEDIUM
Published May 21, 2024 Modified Sep 26, 2025 CWE-668

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.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-668 CWE-668

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/0a9c36a2e06a249acbed64e8e0b84637c2ad7575 https://git.kernel.org/stable/c/2725925982dc96a78069cd118ea3d66759bfdad7 https://git.kernel.org/stable/c/5f6a309a699675680df15d9b6d389114515b4426 https://git.kernel.org/stable/c/741ea2670e021350e54f491106bdaa22dc50e6a0 https://git.kernel.org/stable/c/829f13d6079cf7a2465522f39acb43033e9b320d https://git.kernel.org/stable/c/8657158a3b68c85234e6da3d8eae33d6183588b7 https://git.kernel.org/stable/c/a89936cce87d60766a75732a9e7e25c51164f47c https://git.kernel.org/stable/c/acb96e782bad427ca4bb1bd94af660acd1462380 https://git.kernel.org/stable/c/0a9c36a2e06a249acbed64e8e0b84637c2ad7575 https://git.kernel.org/stable/c/2725925982dc96a78069cd118ea3d66759bfdad7 https://git.kernel.org/stable/c/5f6a309a699675680df15d9b6d389114515b4426 https://git.kernel.org/stable/c/741ea2670e021350e54f491106bdaa22dc50e6a0 https://git.kernel.org/stable/c/829f13d6079cf7a2465522f39acb43033e9b320d https://git.kernel.org/stable/c/8657158a3b68c85234e6da3d8eae33d6183588b7 https://git.kernel.org/stable/c/a89936cce87d60766a75732a9e7e25c51164f47c https://git.kernel.org/stable/c/acb96e782bad427ca4bb1bd94af660acd1462380

Frequently Asked Questions

What is CVE-2021-47401? +
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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2021-47401? +
CVE-2021-47401 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2021-47401? +
CVE-2021-47401 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-47401? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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