What were you trying to do that didn't work?

When opening corrupted file, should get Access Denied. Instead, the file is not neither opened or scanned. 

With samba 4.22:

smbclient //127.0.0.1/virusfilter -U smbuser%... -c "open eicar.com.txt"
Failed to open file \eicar.com.txt. NT_STATUS_ACCESS_DENIED

With samba 4.23:

smbclient //127.0.0.1/virusfilter -U smbuser%... -c "open eicar.com.txt"
open file \eicar.com.txt: for read/write fnum 1

Errors from log:
[2025/11/07 09:15:40.395812,  0, pid=16490, effective(1001, 1001), real(1001, 0), class=virusfilter] ../../source3/modules/vfs_virusfilter_clamav.c:58(virusfilter_clamav_scan_init)
  virusfilter_clamav_scan_init: clamd: Connecting to socket failed: /run/clamd.scan/clamd.sock: Protocol not supported
[2025/11/07 09:15:40.395860,  0, pid=16490, effective(1001, 1001), real(1001, 0), class=virusfilter] ../../source3/modules/vfs_virusfilter.c:1214(virusfilter_scan)
  virusfilter_scan: Scan result: Error: /tmp/virusfilter/eicar.com.txt: Initializing scanner failed

clamd version is the same on both tested machines:
[root@client ~]# clamd --version
ClamAV 1.4.3/27815/Thu Nov  6 05:44:56 2025

What is the impact of this issue to you?

Please provide the package NVR for which the bug is seen:

samba-4.23.0-101.el10.x86_64

works with:

samba-4.22.4-6.el9_7.x86_64

samba-4.22.4-106.el10_1.x86_64

log_4_22.smbd log_4_23.smbd