CVE-2021-47556 is a NULL pointer dereference vulnerability in the Linux kernel's ethtool_set_coalesce() function, affecting the legacy ioctl path. This flaw occurs when a network driver provides only one of the .get_coalesce() or .set_coalesce() callbacks, leading to a system crash instead of an error. With a CVSS score of 5.5 (Medium), it requires local access and low privileges to trigger, resulting in a denial of service (system crash). There is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 5.15, < 5.15.6CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
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
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.