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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在es58x_rx_err_msg函数错误路径中内存泄漏。

AI Predicted 3.3 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 8537257874e949a59c834cecfd5a063e11b64b0b< 4f389e1276a5389c92cef860c9fde8e1c802a871 affected
8537257874e949a59c834cecfd5a063e11b64b0b< 7eb0881aec26099089f12ae850aebd93190b1dfe affected
8537257874e949a59c834cecfd5a063e11b64b0b< d9447f768bc8c60623e4bb3ce65b8f4654d33a50 affected
5.13 affected
< 5.13 unaffected
5.14.19≤ 5.14.* unaffected
5.15.3≤ 5.15.* unaffected
5.16≤ * unaffected
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I. Basic Information for CVE-2021-47671

Vulnerability Information
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Vulnerability Title
can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在es58x_rx_err_msg函数错误路径中内存泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8537257874e949a59c834cecfd5a063e11b64b0b ~ 4f389e1276a5389c92cef860c9fde8e1c802a871 -
Linux Linux 5.13 -

II. Public POCs for CVE-2021-47671

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III. Intelligence Information for CVE-2021-47671

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Other References for CVE-2021-47671 (3)

Same Patch Batch · Linux · 2025-04-17 · 5 CVEs total

CVE-2021-47670 8.8 HIGH can: peak_usb: fix use after free bugs
CVE-2021-47668 8.8 HIGH can: dev: can_restart: fix use after free bug
CVE-2021-47669 7.8 HIGH can: vxcan: vxcan_xmit: fix use after free bug
CVE-2020-36789 can: dev: can_get_echo_skb(): prevent call to kfree_skb() in hard IRQ context

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47671

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