CVE-2021-47668

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47668
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.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94 Patch
https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234 Patch
https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8 Patch
https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a Patch
https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421 Patch
https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328 Patch
https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*
History

21 Apr 2025, 18:41

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:5.11:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: dev: can_restart: fix use after free bug. Tras llamar a netif_rx_ni(skb), desreferenciar skb no es seguro. En particular, se accede al cf can_frame, que crea un alias de memoria skb, después de netif_rx_ni() en: stats->rx_bytes += cf->len;. Reordenar las líneas soluciona el problema.
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94 - () https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94 - Patch
References () https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234 - () https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234 - Patch
References () https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8 - () https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8 - Patch
References () https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a - () https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a - Patch
References () https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421 - () https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421 - Patch
References () https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328 - () https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328 - Patch
References () https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282 - () https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282 - Patch

17 Apr 2025, 19:15

Type Values Removed Values Added
CWE CWE-416
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8

17 Apr 2025, 18:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-04-17 18:15

Updated : 2025-04-21 18:41

NVD link : CVE-2021-47668

Mitre link : CVE-2021-47668

CVE.ORG link : CVE-2021-47668

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free