#VU92415 Missing authorization in Linux kernel - CVE-2021-28375

Vulnerability identifier: #VU92415

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-28375

CWE-ID: CWE-862

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to missing authorization error within the fastrpc_internal_invoke() function in drivers/misc/fastrpc.c. A local user can execute arbitrary code.

Mitigation
Install update from vendor's repository.

Vulnerable software versions

Linux kernel: All versions

---

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

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.