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CVE-2021-47671: can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-17 · updated 2026-06-17
• Weakness: CWE-401

Description

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.

Affected products

• Linux kernel: from 5.13 before 5.14.19; from 5.15 before 5.15.3 — fixed in 5.14.19, 5.15.3

How to fix

Upgrade to a fixed version: Linux kernel 5.14.19, 5.15.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4f389e1276a5389c92cef860c9fde8e1c802a871
• https://git.kernel.org/stable/c/7eb0881aec26099089f12ae850aebd93190b1dfe
• https://git.kernel.org/stable/c/d9447f768bc8c60623e4bb3ce65b8f4654d33a50

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