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CVE-2021-47670— can: peak_usb: fix use after free bugs

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peak_usb驱动中释放后重用skb内存。

CVSS 8.8 · High EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 0a25e1f4f18566b750ebd3ae995af64e23111e63< 5408824636fa0dfedb9ecb0d94abd573131bfbbe affected
0a25e1f4f18566b750ebd3ae995af64e23111e63< ddd1416f44130377798c1430b76503513b7497c2 affected
0a25e1f4f18566b750ebd3ae995af64e23111e63< ec939c13c3fff2114479769c8380b7f1a54feca9 affected
0a25e1f4f18566b750ebd3ae995af64e23111e63< 50aca891d7a554db0901b245167cd653d73aaa71 affected
4.0 affected
< 4.0 unaffected
4.19.171≤ 4.19.* unaffected
5.4.93≤ 5.4.* unaffected
… +2 more rows
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I. Basic Information for CVE-2021-47670

Vulnerability Information
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Vulnerability Title
can: peak_usb: fix use after free bugs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: peak_usb: fix use after free bugs After calling peak_usb_netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the peak_usb_netif_rx_ni(). Reordering the lines solves the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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peak_usb驱动中释放后重用skb内存。
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 0a25e1f4f18566b750ebd3ae995af64e23111e63 ~ 5408824636fa0dfedb9ecb0d94abd573131bfbbe -
Linux Linux 4.0 -

II. Public POCs for CVE-2021-47670

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III. Intelligence Information for CVE-2021-47670

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Other References for CVE-2021-47670 (4)

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

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-2021-47671 can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path
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-2021-47670

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