SB20240531298 - NULL pointer dereference in Linux kernel nfsd
Published: May 31, 2024 Updated: May 14, 2025
Security Bulletin ID
SB20240531298
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-2021-47507)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the init_nfsd(), nfsd4_exit_pnfs() and exit_nfsd() functions in fs/nfsd/nfsctl.c, within the register_cld_notifier() function in fs/nfsd/nfs4recover.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/f5734b1714ca355703e9ea8fb61d04beff1790b9
- https://git.kernel.org/stable/c/c520943a00ad5015704969ad3304c956bcd49d25
- https://git.kernel.org/stable/c/8bf902fee5893cfc2f04a698abab47629699ae9a
- https://git.kernel.org/stable/c/b10252c7ae9c9d7c90552f88b544a44ee773af64
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.85
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.8
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.165