Memory leak in Linux kernel - CVE-2021-29649

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Main Vulnerability Database Vulnerabilities #VU90487

Memory leak in Linux kernel - CVE-2021-29649

Published: March 30, 2021 / Updated: April 5, 2021


Vulnerability identifier: #VU90487
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-2021-29649
CWE-ID: CWE-401
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 memory leak within the umd_cleanup() function in kernel/usermode_driver.c, within the finish() and load_umd() functions in kernel/bpf/preload/bpf_preload_kern.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
kernel-headers
kernel-tools

How to mitigate CVE-2021-29649

Install update from vendor's website.

Linux kernel - update to 5.11.11
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 5.11.11-100.fc32, 5.11.11-200.fc33, 5.11.11-300.fc34
kernel-headers - addressed in versions 5.11.11-100.fc32, 5.11.11-200.fc33, 5.11.11-300.fc34
kernel-tools - addressed in versions 5.11.11-100.fc32, 5.11.11-200.fc33, 5.11.11-300.fc34

External References

Related Security Bulletins