SB2024060105 - NULL pointer dereference in Linux kernel block driver
Published: June 1, 2024 Updated: May 14, 2025
Security Bulletin ID
SB2024060105
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2021-46981)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the nbd_disconnect_and_put() function in drivers/block/nbd.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1c4962df938891af9ab4775f5224ef8601764107
- https://git.kernel.org/stable/c/cde4b55cfb24522dcbba80bbdb0c082303e76c43
- https://git.kernel.org/stable/c/b31d237796fd618379ec8e0f4de3370b5e4aeee7
- https://git.kernel.org/stable/c/54b78ba7e96e5fe1edb8054e375d31a6c0dc60dc
- https://git.kernel.org/stable/c/79ebe9110fa458d58f1fceb078e2068d7ad37390
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.38
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.22
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.120