CVE-2021-47668

can: dev: can_restart: fix use after free bug

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved: can: dev: can_restart: fix use after free bug After calling netif_rx_ni(skb), dereferencing skb is unsafe.
Especially, the can_frame cf which aliases skb memory is accessed
after the netif_rx_ni() in: stats->rx_bytes += cf->len; Reordering the lines solves the issue.

*Credits: N/A

CVSS Scores

CISAv3.1 7.8

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

None

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2025-04-16 CVE Reserved
2025-04-17 CVE Published
2025-04-17 CVE Updated
---------- EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-416: Use After Free

CAPEC

References (8)

URL	Tag	Source
https://git.kernel.org/stable/c/39549eef3587f1c1e8c65c88a2400d10fd30ea17	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8	2021-01-30
https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282	2021-01-30
https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421	2021-01-30
https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234	2021-01-27
https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328	2021-01-27
https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a	2021-01-27
https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94	2021-01-20

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.31 < 4.4.254 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 4.4.254"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.31 < 4.9.254 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 4.9.254"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.31 < 4.14.218 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 4.14.218"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.31 < 4.19.171 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 4.19.171"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.31 < 5.4.93 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 5.4.93"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.31 < 5.10.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 5.10.11"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.31 < 5.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 5.11"		en		Affected