CVE-2025-40320— smb: client: fix potential cfid UAF in smb2_query_info_compound
Possible ATT&CK Techniques 2AI
T1211 · Exploitation for Stealth T1068 · Exploitation for Privilege EscalationAffected Version Matrix 11
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 433042a91f9373241307725b52de573933ffedbf< 939c4e33005e2a56ea8fcedddf0da92df864bd3b | affected |
4f1fffa2376922f3d1d506e49c0fd445b023a28e< 327f89c21601ebb7889f8c97754b76f08ce95a0c | affected | ||
4f1fffa2376922f3d1d506e49c0fd445b023a28e< b556c278d43f4707a9073ca74d55581b4f279806 | affected | ||
4f1fffa2376922f3d1d506e49c0fd445b023a28e< 5c76f9961c170552c1d07c830b5e145475151600 | affected | ||
6.6.32< 6.6.117 | affected | ||
6.8 | affected | ||
< 6.8 | unaffected | ||
6.6.117≤ 6.6.* | unaffected | ||
| … +3 more rows | |||
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I. Basic Information for CVE-2025-40320
Vulnerability Information
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Vulnerability Title
smb: client: fix potential cfid UAF in smb2_query_info_compound
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential cfid UAF in smb2_query_info_compound When smb2_query_info_compound() retries, a previously allocated cfid may have been freed in the first attempt. Because cfid wasn't reset on replay, later cleanup could act on a stale pointer, leading to a potential use-after-free. Reinitialize cfid to NULL under the replay label. Example trace (trimmed): refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 11224 at ../lib/refcount.c:28 refcount_warn_saturate+0x9c/0x110 [...] RIP: 0010:refcount_warn_saturate+0x9c/0x110 [...] Call Trace: <TASK> smb2_query_info_compound+0x29c/0x5c0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] ? step_into+0x10d/0x690 ? __legitimize_path+0x28/0x60 smb2_queryfs+0x6a/0xf0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] smb311_queryfs+0x12d/0x140 [cifs f90b72658819bd21c94769b6a652029a07a7172f] ? kmem_cache_alloc+0x18a/0x340 ? getname_flags+0x46/0x1e0 cifs_statfs+0x9f/0x2b0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] statfs_by_dentry+0x67/0x90 vfs_statfs+0x16/0xd0 user_statfs+0x54/0xa0 __do_sys_statfs+0x20/0x50 do_syscall_64+0x58/0x80
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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，该漏洞源于释放后重用，可能导致内存损坏。
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-2025-40320
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2025-12-08 · 82 CVEs total
| CVE-2023-53751 | 9.8 CRITICAL | cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname |
| CVE-2023-53769 | 9.3 CRITICAL | virt/coco/sev-guest: Double-buffer messages |
| CVE-2023-53764 | 8.8 HIGH | wifi: ath12k: Handle lock during peer_id find |
| CVE-2025-40318 | 8.8 HIGH | Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once |
| CVE-2023-53762 | 8.8 HIGH | Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync |
| CVE-2025-40292 | 8.4 HIGH | virtio-net: fix received length check in big packets |
| CVE-2025-40309 | 8.0 HIGH | Bluetooth: SCO: Fix UAF on sco_conn_free |
| CVE-2025-40302 | 7.8 HIGH | media: videobuf2: forbid remove_bufs when legacy fileio is active |
| CVE-2023-53763 | 7.8 HIGH | Revert "f2fs: fix to do sanity check on extent cache correctly" |
| CVE-2023-53768 | 7.8 HIGH | regmap-irq: Fix out-of-bounds access when allocating config buffers |
| CVE-2025-40297 | 7.8 HIGH | net: bridge: fix use-after-free due to MST port state bypass |
| CVE-2022-50630 | 7.8 HIGH | mm: hugetlb: fix UAF in hugetlb_handle_userfault |
| CVE-2022-50623 | 7.8 HIGH | fpga: prevent integer overflow in dfl_feature_ioctl_set_irq() |
| CVE-2023-53759 | 7.8 HIGH | HID: hidraw: fix data race on device refcount |
| CVE-2025-40317 | 7.8 HIGH | regmap: slimbus: fix bus_context pointer in regmap init calls |
| CVE-2025-40319 | 7.8 HIGH | bpf: Sync pending IRQ work before freeing ring buffer |
| CVE-2023-53747 | 7.8 HIGH | vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF |
| CVE-2025-40323 | 7.8 HIGH | fbcon: Set fb_display[i]->mode to NULL when the mode is released |
| CVE-2023-53753 | 7.8 HIGH | drm/amd/display: fix mapping to non-allocated address |
| CVE-2023-53752 | 7.8 HIGH | net: deal with integer overflows in kmalloc_reserve() |
Showing top 20 of 82 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
Same vendor: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
V. Comments for CVE-2025-40320
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