Medium 5.5Published Feb 14, 2026

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

Updated under an hour ago (Oct 26, 2026, 9:23 PM ET)

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Exploited in the last 30 days

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: <TASK> 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

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 17e53a15e64b65623b8f2b1185d27d7b1cbf69ab before 743f70406264348c0830f38409eb6c40a42fb2db; 18066188eb90cc0c798f3370a8078a79ddb73f70 builds before 3a6d6b332f92990958602c1e35ce0173e2dd62e9; from 6ebb9d54eccc8026b386e76eff69364d33373da5 before b64e3b5d8d759dd4333992e4ba4dadf9359952c8; from e255612b5ed9f179abe8196df7c2ba09dd227900 before 9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5; from e255612b5ed9f179abe8196df7c2ba09dd227900 before e3a43633023e3cacaca60d4b8972d084a2b06236; bcd15f06c7e8904116cfb06526bcc189b86aff85; from 6.1.141 before 6.1.163; from 6.6.93 before 6.6.124; and 2 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 6.1.141 before 6.1.163; from 6.6.93 before 6.6.124; from 6.12.31 before 6.12.70; from 6.14.9 before 6.18.10; 6.19; 6.19; 6.19; 6.19; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/743f70406264348c0830f38409eb6c40a42fb2db	patch
https://git.kernel.org/stable/c/3a6d6b332f92990958602c1e35ce0173e2dd62e9	patch
https://git.kernel.org/stable/c/b64e3b5d8d759dd4333992e4ba4dadf9359952c8	patch
https://git.kernel.org/stable/c/9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5	patch
https://git.kernel.org/stable/c/e3a43633023e3cacaca60d4b8972d084a2b06236	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.