Use-after-free in Linux kernel sw siw driver

1) Use-after-free

EUVDB-ID: #VU90253

Risk: Low

CVSSv3.1: 7.7 [AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47012

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the siw_mr_add_mem() function in drivers/infiniband/sw/siw/siw_mem.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

External links

http://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4
http://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c
http://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4
http://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155
http://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63

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.