CVE-2021-47520
Linux kernel: Realtek CAN use-after-free vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is dereferenced just after the call netif_receive_skb(skb). Reordering the lines solves the issue.
INFO
Published Date :
May 24, 2024, 3:15 p.m.
Last Modified :
June 10, 2024, 6:42 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-2021-47520.
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-2021-47520 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47520 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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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jun. 10, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76 No Types Assigned https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76 Patch Changed Reference Type https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa No Types Assigned https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa Patch Changed Reference Type https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7 No Types Assigned https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7 Patch Changed Reference Type https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e No Types Assigned https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e Patch Changed Reference Type https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db No Types Assigned https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db Patch Changed Reference Type https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4 No Types Assigned https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4 Patch Changed Reference Type https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3 No Types Assigned https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3 Patch Changed Reference Type https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d No Types Assigned https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d Patch Added CWE NIST CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.37 up to (excluding) 4.4.295 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 up to (excluding) 4.9.293 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.258 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.221 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.165 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.85 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.8 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 24, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is dereferenced just after the call netif_receive_skb(skb). Reordering the lines solves the issue. Added Reference kernel.org https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47520 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-2021-47520
weaknesses.