GHSA-9RCV-5G2J-597R
Vulnerability from github – Published: 2026-02-14 18:30 – Updated: 2026-03-18 18:31In the Linux kernel, the following vulnerability has been resolved:
smb/client: fix memory leak in smb2_open_file()
Reproducer:
- server: directories are exported read-only
- client: mount -t cifs //${server_ip}/export /mnt
- client: dd if=/dev/zero of=/mnt/file bs=512 count=1000 oflag=direct
- client: umount /mnt
- client: sleep 1
- client: modprobe -r cifs
The error message is as follows:
============================================================================= BUG cifs_small_rq (Not tainted): Objects remaining on __kmem_cache_shutdown()
Object 0x00000000d47521be @offset=14336 ... WARNING: mm/slub.c:1251 at __kmem_cache_shutdown+0x34e/0x440, CPU#0: modprobe/1577 ... Call Trace: kmem_cache_destroy+0x94/0x190 cifs_destroy_request_bufs+0x3e/0x50 [cifs] cleanup_module+0x4e/0x540 [cifs] __se_sys_delete_module+0x278/0x400 __x64_sys_delete_module+0x5f/0x70 x64_sys_call+0x2299/0x2ff0 do_syscall_64+0x89/0x350 entry_SYSCALL_64_after_hwframe+0x76/0x7e ... kmem_cache_destroy cifs_small_rq: Slab cache still has objects when called from cifs_destroy_request_bufs+0x3e/0x50 [cifs] WARNING: mm/slab_common.c:532 at kmem_cache_destroy+0x16b/0x190, CPU#0: modprobe/1577
{
"affected": [],
"aliases": [
"CVE-2026-23205"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-02-14T17:15:58Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix memory leak in smb2_open_file()\n\nReproducer:\n\n 1. server: directories are exported read-only\n 2. client: mount -t cifs //${server_ip}/export /mnt\n 3. client: dd if=/dev/zero of=/mnt/file bs=512 count=1000 oflag=direct\n 4. client: umount /mnt\n 5. client: sleep 1\n 6. client: modprobe -r cifs\n\nThe error message is as follows:\n\n =============================================================================\n BUG cifs_small_rq (Not tainted): Objects remaining on __kmem_cache_shutdown()\n -----------------------------------------------------------------------------\n\n Object 0x00000000d47521be @offset=14336\n ...\n WARNING: mm/slub.c:1251 at __kmem_cache_shutdown+0x34e/0x440, CPU#0: modprobe/1577\n ...\n Call Trace:\n \u003cTASK\u003e\n kmem_cache_destroy+0x94/0x190\n cifs_destroy_request_bufs+0x3e/0x50 [cifs]\n cleanup_module+0x4e/0x540 [cifs]\n __se_sys_delete_module+0x278/0x400\n __x64_sys_delete_module+0x5f/0x70\n x64_sys_call+0x2299/0x2ff0\n do_syscall_64+0x89/0x350\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n ...\n kmem_cache_destroy cifs_small_rq: Slab cache still has objects when called from cifs_destroy_request_bufs+0x3e/0x50 [cifs]\n WARNING: mm/slab_common.c:532 at kmem_cache_destroy+0x16b/0x190, CPU#0: modprobe/1577",
"id": "GHSA-9rcv-5g2j-597r",
"modified": "2026-03-18T18:31:11Z",
"published": "2026-02-14T18:30:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23205"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3a6d6b332f92990958602c1e35ce0173e2dd62e9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/743f70406264348c0830f38409eb6c40a42fb2db"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b64e3b5d8d759dd4333992e4ba4dadf9359952c8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e3a43633023e3cacaca60d4b8972d084a2b06236"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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