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Vulnerability record · CVE-2021-28375 · published 15 March 2021

CVE-2021-28375: Linux kernel missing authorization vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.31% · top 78.8% CWE-862 · Missing authorization
7.8CVSS 3.1 base score, v2 7.2
0.31%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/linus/20c40794eb85ea29852d7bc37c55713802a543d6 Mailing ListPatchVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMRQVOTASD3VZP6GE4JJHE2
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TJPVQZPY3DHPV5I3IVNMSMO
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XAUNYDTGE6MB4NWL2SIHPCO
https://lore.kernel.org/stable/YD03ew7+6v0XPh6l%40kroah.com/
https://security.netapp.com/advisory/ntap-20210401-0003/ Third Party Advisory
https://git.kernel.org/linus/20c40794eb85ea29852d7bc37c55713802a543d6 Mailing ListPatchVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMRQVOTASD3VZP6GE4JJHE2
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TJPVQZPY3DHPV5I3IVNMSMO
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XAUNYDTGE6MB4NWL2SIHPCO
https://lore.kernel.org/stable/YD03ew7+6v0XPh6l%40kroah.com/
https://security.netapp.com/advisory/ntap-20210401-0003/ Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-28375), CISA KEV, FIRST EPSS (scores of 2026-10-06). This page is refreshed as NVD updates the record.