CVE-2021-47668
Linux Kernel CAN: Use After Free
Description
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.
INFO
Published Date :
April 17, 2025, 6:15 p.m.
Last Modified :
April 21, 2025, 6:41 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47668.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47668 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47668 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Apr. 21, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.11:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.11:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.11:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.31 up to (excluding) 4.4.254 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.218 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 up to (excluding) 4.9.254 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.171 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.93 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.11 Added Reference Type kernel.org: https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282 Types: Patch -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 17, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 17, 2025
Action Type Old Value New Value Added Description 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. Added Reference https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94 Added Reference https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234 Added Reference https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8 Added Reference https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a Added Reference https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421 Added Reference https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328 Added Reference https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47668 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47668
weaknesses.