Denial of service in Linux kernel FUSE filesystem



Published: 2021-04-14 | Updated: 2022-01-11
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-36322
CWE-ID CWE-404
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Linux kernel
Operating systems & Components / Operating system

Vendor

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper Resource Shutdown or Release

EUVDB-ID: #VU59473

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/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-2020-36322

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

Exploit availability: No

Description

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

The vulnerability exists in the FUSE filesystem implementation in the Linux kernel due to fuse_do_getattr() calls make_bad_inode() in inappropriate situations. A local user can run a specially crafted program to trigger kernel crash.

Note, the vulnerability exists due to incomplete fix for #VU58207 (CVE-2021-28950).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.10.6


CPE2.3 External links

http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.6
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5d069dbe8aaf2a197142558b6fb2978189ba3454
http://lists.debian.org/debian-lts-announce/2021/06/msg00020.html

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.



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