Denial of service in unix_stream_recvmsg in Linux kernel



Published: 2021-03-18
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-20265
CWE-ID CWE-400
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) Resource exhaustion

EUVDB-ID: #VU51548

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-2021-20265

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources in the unix_stream_recvmsg function in the Linux kernel when a signal was pending. A local user can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 4.5 rc3

External links

http://bugzilla.redhat.com/show_bug.cgi?id=1908827
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fa0dc04df259ba2df3ce1920e9690c7842f8fa4b


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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