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.

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.

The SUSE Linux Enterprise 15 SP3 kernel was updated to receive various security bug fixes.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

Single

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* 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
2025-05-04 CVE Updated
2025-06-24 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