Use-after-free in Linux kernel ulp rtrs driver

1) Use-after-free

EUVDB-ID: #VU90254

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-2021-47026

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 rtrs_clt_remove_path_from_sysfs() function in drivers/infiniband/ulp/rtrs/rtrs-clt.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/b64415c6b3476cf9fa4d0aea3807065b8403a937
http://git.kernel.org/stable/c/676171f9405dcaa45a33d18241c32f387dbaae39
http://git.kernel.org/stable/c/d3cca8067d43dfee4a3535c645b55f618708dccb
http://git.kernel.org/stable/c/7f4a8592ff29f19c5a2ca549d0973821319afaad

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.