CVE-2025-40268— cifs: client: fix memory leak in smb3_fs_context_parse_param
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I. Basic Information for CVE-2025-40268
Vulnerability Information
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Vulnerability Title
cifs: client: fix memory leak in smb3_fs_context_parse_param
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cifs: client: fix memory leak in smb3_fs_context_parse_param The user calls fsconfig twice, but when the program exits, free() only frees ctx->source for the second fsconfig, not the first. Regarding fc->source, there is no code in the fs context related to its memory reclamation. To fix this memory leak, release the source memory corresponding to ctx or fc before each parsing. syzbot reported: BUG: memory leak unreferenced object 0xffff888128afa360 (size 96): backtrace (crc 79c9c7ba): kstrdup+0x3c/0x80 mm/util.c:84 smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444 BUG: memory leak unreferenced object 0xffff888112c7d900 (size 96): backtrace (crc 79c9c7ba): smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629 smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于smb3_fs_context_parse_param未正确释放内存，可能导致内存泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-40268
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Same Patch Batch · Linux · 2025-12-06 · 23 CVEs total
| CVE-2025-40278 | net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak | |
| CVE-2025-40267 | io_uring/rw: ensure allocated iovec gets cleared for early failure | |
| CVE-2025-40269 | ALSA: usb-audio: Fix potential overflow of PCM transfer buffer | |
| CVE-2025-40270 | mm, swap: fix potential UAF issue for VMA readahead | |
| CVE-2025-40271 | fs/proc: fix uaf in proc_readdir_de() | |
| CVE-2025-40272 | mm/secretmem: fix use-after-free race in fault handler | |
| CVE-2025-40273 | NFSD: free copynotify stateid in nfs4_free_ol_stateid() | |
| CVE-2025-40274 | KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying | |
| CVE-2025-40275 | ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd | |
| CVE-2025-40276 | drm/panthor: Flush shmem writes before mapping buffers CPU-uncached | |
| CVE-2025-40277 | drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE | |
| CVE-2025-40289 | drm/amdgpu: hide VRAM sysfs attributes on GPUs without VRAM | |
| CVE-2025-40279 | net: sched: act_connmark: initialize struct tc_ife to fix kernel leak | |
| CVE-2025-40280 | tipc: Fix use-after-free in tipc_mon_reinit_self(). | |
| CVE-2025-40281 | sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto | |
| CVE-2025-40282 | Bluetooth: 6lowpan: reset link-local header on ipv6 recv path | |
| CVE-2025-40283 | Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF | |
| CVE-2025-40284 | Bluetooth: MGMT: cancel mesh send timer when hdev removed | |
| CVE-2025-40285 | smb/server: fix possible refcount leak in smb2_sess_setup() | |
| CVE-2025-40286 | smb/server: fix possible memory leak in smb2_read() |
Showing top 20 of 23 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-40268
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