Vulnerability identifier: #VU93171

Vulnerability 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-2021-47366

CWE-ID: CWE-119

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 perform a denial of service (DoS) attack.

The vulnerability exists due to memory corruption within the afs_fs_fetch_data(), afs_fs_store_data(), afs_fs_setattr_size() and afs_deliver_fs_get_capabilities() functions in fs/afs/fsclient.c, within the afs_fileserver_probe_result() and clear_bit() functions in fs/afs/fs_probe.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel:

---

External links
http://git.kernel.org/stable/c/e66fc460d6dcf85cf12288e133a081205aebcd97
http://git.kernel.org/stable/c/b537a3c21775075395af475dcc6ef212fcf29db8

---

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.