CVE-2021-28375
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.
02 / AFFECTED SOFTWARE
Affected packages
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In fastrpc_internal_invoke of drivers/misc/fastrpc.c, there is a possible way for user-mode processes to send fastrpc kernel requests due to a missing permission check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
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.
05 / REFERENCES
Further evidence
- https://android.googlesource.com/kernel/common/+/20c40794eb85ea29852d7bc37c55713802a543d6
- https://source.android.com/security/bulletin/2021-08-01
- https://git.kernel.org/linus/20c40794eb85ea29852d7bc37c55713802a543d6
- 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://lore.kernel.org/stable/YD03ew7+6v0XPh6l%40kroah.com/
- https://security.netapp.com/advisory/ntap-20210401-0003/