CVE-2021-28375

high

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

8.0

Description

An issue was discovered in the Linux kernel through 5.11.6. fastrpc_internal_invoke in drivers/misc/fastrpc.c does not prevent user applications from sending kernel RPC messages, aka CID-20c40794eb85. This is a related issue to CVE-2019-2308.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-28375

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-28375.html

OS impact

OS	Version	Status	Fixed in
arch		fixed	`5.10.24-1`
sles		affected
debian	bookworm	fixed	`5.10.24-1`
debian	bullseye	fixed	`5.10.24-1`
debian	forky	fixed	`5.10.24-1`
debian	sid	fixed	`5.10.24-1`
debian	trixie	fixed	`5.10.24-1`

References

https://www.suse.com/security/cve/CVE-2021-28375.html
https://security-tracker.debian.org/tracker/CVE-2021-28375

Verify integrity in audit chain (admin only). AS-IS.