CVE-2026-64399— ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
Affected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | eb817368f50c1cbe1bd07044124aad7db6330e3a< bf460ad5958d506492de4524a656439da3f99c51 | affected |
eb817368f50c1cbe1bd07044124aad7db6330e3a< 620d133d469295ee7c017ca6aafac335f65c4a5a | affected | ||
eb817368f50c1cbe1bd07044124aad7db6330e3a< 9b9cf7e65cbeaae1b6636144bacee611cdd7a5d6 | affected | ||
eb817368f50c1cbe1bd07044124aad7db6330e3a< baae7b39673ec21073a25e3d14f8feaada01d5df | affected | ||
eb817368f50c1cbe1bd07044124aad7db6330e3a< c917e4522d251071dde9871b9142d8ea1186ebfe | affected | ||
eb817368f50c1cbe1bd07044124aad7db6330e3a< 388e4139db27a9e3612c9d356b826f5b1ff6a9e3 | affected | ||
5.15 | affected | ||
< 5.15 | unaffected | ||
| … +6 more rows | |||
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I. Basic Information for CVE-2026-64399
Vulnerability Information
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Vulnerability Title
ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE The FSCTL_DUPLICATE_EXTENTS_TO_FILE arm of smb2_ioctl() overwrites the destination file's data via vfs_clone_file_range() with neither the share-level KSMBD_TREE_CONN_FLAG_WRITABLE check nor a per-handle fp->daccess check that the other write-bearing arms carry. A client can overwrite destination data on a read-only share, or from a handle opened with only FILE_WRITE_ATTRIBUTES (which still yields an FMODE_WRITE filp). FILE_WRITE_ATTRIBUTES-only destination handle overwrote the file's data via the clone. Add both checks, matching the FSCTL_SET_SPARSE permission fix; require FILE_WRITE_DATA since this writes data.
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基金会开源的一款操作系统内核。 Linux kernel 5.15版本存在安全漏洞，该漏洞源于ksmbd的FSCTL_DUPLICATE_EXTENTS_TO_FILE操作缺少权限检查，可能导致客户端覆盖目标文件数据。
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-2026-64399
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-64399 (5)
Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total
| CVE-2026-64355 | 9.8 CRITICAL | bpf: Reject fragmented frames in devmap |
| CVE-2026-64410 | 9.8 CRITICAL | netfilter: flowtable: IPIP tunnel hardware offload is not yet support |
| CVE-2026-64397 | 9.8 CRITICAL | ksmbd: serialize QUERY_DIRECTORY requests per file |
| CVE-2026-64391 | 9.8 CRITICAL | ksmbd: use opener credentials for ADS I/O |
| CVE-2026-64387 | 9.8 CRITICAL | smb: client: fix query directory replay double-free |
| CVE-2026-64386 | 9.8 CRITICAL | smb: client: fix query_info() replay double-free |
| CVE-2026-64385 | 9.8 CRITICAL | smb: client: fix double-free in SMB2_ioctl() replay |
| CVE-2026-64383 | 9.8 CRITICAL | smb: client: fix double-free in SMB2_flush() replay |
| CVE-2026-64384 | 9.8 CRITICAL | smb: client: fix change notify replay double-free |
| CVE-2026-64268 | 9.8 CRITICAL | RDMA/siw: bound Read Response placement to the RREAD length |
| CVE-2026-64439 | 9.8 CRITICAL | crypto: krb5 - filter out async aead implementations at alloc |
| CVE-2026-64303 | 9.8 CRITICAL | spi: fsl-lpspi: terminate the RX channel on TX prepare failure path |
| CVE-2026-64459 | 9.8 CRITICAL | tcp: restore RCU grace period in tcp_ao_destroy_sock |
| CVE-2026-64523 | 9.8 CRITICAL | net/handshake: Take a long-lived file reference at submit |
| CVE-2026-64392 | 9.1 CRITICAL | ksmbd: use opener credentials for delete-on-close |
| CVE-2026-64319 | 9.1 CRITICAL | nvmet-auth: validate reply message payload bounds against transfer length |
| CVE-2026-64269 | 9.1 CRITICAL | RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg |
| CVE-2026-64450 | 9.1 CRITICAL | tipc: fix out-of-bounds read in broadcast Gap ACK blocks |
| CVE-2026-64393 | 9.1 CRITICAL | ksmbd: run set info with opener credentials |
| CVE-2026-64257 | 9.1 CRITICAL | smb: client: reject overlapping data areas in SMB2 responses |
Showing top 20 of 274 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-68480
x86/bugs: Make Safe-RET robust against interrupt injection - CVE-2026-64604
KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is - CVE-2026-64602
iio: adc: spear: Initialize completion before requesting IRQ - CVE-2026-64603
platform/x86: intel-hid: Protect ACPI notify handler against - CVE-2026-64601
ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_
Same vendor: Linux
- CVE-2026-68480
x86/bugs: Make Safe-RET robust against interrupt injection - CVE-2026-64604
KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is - CVE-2026-64602
iio: adc: spear: Initialize completion before requesting IRQ - CVE-2026-64603
platform/x86: intel-hid: Protect ACPI notify handler against - CVE-2026-64601
ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_
V. Comments for CVE-2026-64399
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