CVE-2026-64393— ksmbd: run set info with opener credentials
Possible ATT&CK Techniques 1AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 5cbabf3a71575cd31bc7785d92d4ab42338a654b | affected |
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< b35afd5cf8fab236ef21117e42ee45691d4ffa7b | affected | ||
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 0ce682867fd506f61f40c76bde7e4205bde34e87 | affected | ||
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 20ee516a62989a8d505ee432f9e59525ea23984e | affected | ||
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 8cc9ec711f5255167247a9ab6a7179b787426ed7 | affected | ||
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< b383bcad3d2fe634b26efbce53e22bbb5753a520 | affected | ||
5.15 | affected | ||
< 5.15 | unaffected | ||
| … +6 more rows | |||
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I. Basic Information for CVE-2026-64393
Vulnerability Information
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Vulnerability Title
ksmbd: run set info with opener credentials
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB2 SET_INFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the current ksmbd worker credentials. Run the complete SET_INFO dispatch with the credentials captured when the handle was opened. This also removes the separate security information credential setup and keeps all SET_INFO classes under one credential scope. Direct override_creds() is used because it can nest with the request credential overrides already used by rename and link helpers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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SMB2 SET_INFO handlers在检查访问掩码后使用当前工作进程凭据进行权限检查，而不是使用打开句柄时的凭据，可能导致权限绕过。
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-2026-64393
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-64393 (6)
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-2026-64399 | 9.8 CRITICAL | ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE |
| 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-2026-64523 | 9.8 CRITICAL | net/handshake: Take a long-lived file reference at submit |
| CVE-2026-64459 | 9.8 CRITICAL | tcp: restore RCU grace period in tcp_ao_destroy_sock |
| CVE-2026-64257 | 9.1 CRITICAL | smb: client: reject overlapping data areas in SMB2 responses |
| CVE-2026-64392 | 9.1 CRITICAL | ksmbd: use opener credentials for delete-on-close |
| 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-2026-64319 | 9.1 CRITICAL | nvmet-auth: validate reply message payload bounds against transfer length |
Showing top 20 of 274 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec - CVE-2026-64557
Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_conne
Same vendor: Linux
- CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec - CVE-2026-64557
Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_conne
V. Comments for CVE-2026-64393
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