SB2025040295 - Double free in Linux kernel smb server

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Main Vulnerability Database SB2025040295

SB2025040295 - Double free in Linux kernel smb server

Published: April 2, 2025 Updated: May 11, 2025

Security Bulletin ID SB2025040295
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Double free (CVE-ID: CVE-2025-21955)

CWE-ID: CWE-415 - Double Free

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 a double free error within the handle_ksmbd_work() and queue_ksmbd_work() functions in fs/smb/server/server.c, within the __smb2_oplock_break_noti(), smb2_oplock_break_noti(), __smb2_lease_break_noti() and smb2_lease_break_noti() functions in fs/smb/server/oplock.c, within the ksmbd_conn_init_server_callbacks() function in fs/smb/server/connection.c. A local user can perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References