Linux Kernel up to 5.14.18/5.15.2 es58x_rx_err_msg memory leak

Summaryinfo

A vulnerability has been found in Linux Kernel up to 5.14.18/5.15.2 and classified as critical. This impacts the function es58x_rx_err_msg. The manipulation leads to memory leak. This vulnerability is uniquely identified as CVE-2021-47671. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.14.18/5.15.2. It has been rated as critical. This issue affects the function es58x_rx_err_msg. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path In es58x_rx_err_msg(), if can->do_set_mode() fails, the function directly returns without calling netif_rx(skb). This means that the skb previously allocated by alloc_can_err_skb() is not freed. In other terms, this is a memory leak. This patch simply removes the return statement in the error branch and let the function continue. Issue was found with GCC -fanalyzer, please follow the link below for details.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2021-47671 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.14.19 or 5.15.3 eliminates this vulnerability. Applying the patch 4f389e1276a5389c92cef860c9fde8e1c802a871/7eb0881aec26099089f12ae850aebd93190b1dfe/d9447f768bc8c60623e4bb3ce65b8f4654d33a50 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-0861). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Debian Linux
• Google Cloud Platform
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Open Source Linux Kernel
• SolarWinds Security Event Manager
• Dell Secure Connect Gateway

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.14.0
• 5.14.1
• 5.14.2
• 5.14.3
• 5.14.4
• 5.14.5
• 5.14.6
• 5.14.7
• 5.14.8
• 5.14.9
• 5.14.10
• 5.14.11
• 5.14.12
• 5.14.13
• 5.14.14
• 5.14.15
• 5.14.16
• 5.14.17
• 5.14.18
• 5.15.0
• 5.15.1
• 5.15.2

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Exploitinginfo

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Entryinfo

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