CVE-2021-47439 is a null pointer dereference vulnerability in the Linux kernel's Microchip DSA (Distributed Switch Architecture) driver. Specifically, it affects the ksz module, leading to a kernel crash when the module is removed. The vulnerability arises because the mib_read_workqueue can be rescheduled after the associated slave device has been unregistered, causing a dereference of a null pointer. The vulnerability has a CVSSv3.1 score of 5.5 (Medium), indicating a local attack vector with low attack complexity, requiring low privileges, and resulting in high availability impact (a denial of service). There is no confidentiality or integrity impact. There is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB. Community discussion and media coverage for this CVE are minimal.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 5.7, < 5.10.75CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 5.11, < 5.14.14CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
5.15CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* | ||
5.15CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* | ||
5.15CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.