Improper locking in Linux kernel - CVE-2021-28951

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Main Vulnerability Database Vulnerabilities #VU90811

Improper locking in Linux kernel - CVE-2021-28951

Published: March 20, 2021 / Updated: May 12, 2022


Vulnerability identifier: #VU90811
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-28951
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to improper locking within the io_sq_offload_start(), io_disable_sqo_submit() and io_register_enable_rings() functions in fs/io_uring.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Ubuntu
Fedora
linux-image-5.10.0-1026-oem (Ubuntu package)
linux-image-oem-20.04b (Ubuntu package)
kernel

How to mitigate CVE-2021-28951

Install update from vendor's website.

linux-image-5.10.0-1026-oem (Ubuntu package) - update to 5.10.0-1026.27
linux-image-oem-20.04b (Ubuntu package) - update to 5.10.0.1026.27
kernel - addressed in versions 5.11.9-100.fc32, 5.11.9-200.fc33, 5.11.9-300.fc34, 5.11.10-100.fc32

External References

Related Security Bulletins