CVE-2026-23205 – smb/client: fix memory leak in smb2_open_file()

CVE ID : CVE-2026-23205

Published : Feb. 14, 2026, 5:15 p.m. | 1 hour, 14 minutes ago

Description : In the Linux kernel, the following vulnerability has been resolved:

smb/client: fix memory leak in smb2_open_file()

Reproducer:

1. server: directories are exported read-only
2. client: mount -t cifs //${server_ip}/export /mnt
3. client: dd if=/dev/zero of=/mnt/file bs=512 count=1000 oflag=direct
4. client: umount /mnt
5. client: sleep 1
6. client: modprobe -r cifs

The error message is as follows:

=============================================================================
BUG cifs_small_rq (Not tainted): Objects remaining on __kmem_cache_shutdown()
—————————————————————————–

Object 0x00000000d47521be @offset=14336
…
WARNING: mm/slub.c:1251 at __kmem_cache_shutdown+0x34e/0x440, CPU#0: modprobe/1577
…
Call Trace:

kmem_cache_destroy+0x94/0x190
cifs_destroy_request_bufs+0x3e/0x50 [cifs] cleanup_module+0x4e/0x540 [cifs] __se_sys_delete_module+0x278/0x400
__x64_sys_delete_module+0x5f/0x70
x64_sys_call+0x2299/0x2ff0
do_syscall_64+0x89/0x350
entry_SYSCALL_64_after_hwframe+0x76/0x7e
…
kmem_cache_destroy cifs_small_rq: Slab cache still has objects when called from cifs_destroy_request_bufs+0x3e/0x50 [cifs] WARNING: mm/slab_common.c:532 at kmem_cache_destroy+0x16b/0x190, CPU#0: modprobe/1577

Severity: 0.0 | NA

Visit the link for more details, such as CVSS details, affected products, timeline, and more…