Memory leak in Linux kernel fuse

1) Memory leak

EUVDB-ID: #VU90043

Risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-46956

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the virtio_fs_probe() function in fs/fuse/virtio_fs.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

External links

http://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8
http://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15
http://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae
http://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6
http://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4

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.