SB2025090855 - NULL pointer dereference in Linux kernel netfs
Published: September 8, 2025
Security Bulletin ID
SB2025090855
CSH 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 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2025-39723)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the iter_file_splice_write() function in fs/splice.c, within the netfs_create_write_req() function in fs/netfs/write_issue.c, within the netfs_write_collection() function in fs/netfs/write_collect.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.