SB20260816193 - Use-after-free in Linux kernel smb server

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Main Vulnerability Database SB20260816193

SB20260816193 - Use-after-free in Linux kernel smb server

Published: August 16, 2026

Security Bulletin ID SB20260816193
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) Use-after-free (CVE-ID: CVE-2026-74522)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in __close_file_table_ids() when tearing down a file table after logical file close and reference release across sessions. A local user can trigger cross-session file reference handling to dereference a stale pointer and cause a denial of service.

Exploitation requires another session to hold a temporary reference to the same ksmbd_file obtained through ksmbd_lookup_fd_inode().


Remediation

Install update from vendor's website.

References