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CVE-2026-64379— smb: client: mask server-provided mode to 07777 in modefromsid

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于parse_dacl()函数在处理modefromsid时未对服务器提供的模式值进行掩码操作到07777，可能导致权限设置异常。

CVSS 7.1 · High EPSS 0.31% · P23

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e2f8fbfb8d09c06decde162090fac3ee220aa280< 5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14 affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< ee2216dbdf0c677e89bb43e03247dba590ed00ef affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< f511807feee7cb29b61bdfa86472c7e9e2e5df94 affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< 08c600b7e1818539ba5efee4cdb06215c245ca78 affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< c6c484a7d5bff6b929a86d7ed5130f29834c6a0d affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< f80add1bfb3425100a325b14f19648e75669a954 affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< e3d9c7160d483fc8f9e225aafad8ecbbc43f3151 affected
… +10 more rows
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I. Basic Information for CVE-2026-64379

Vulnerability Information
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Vulnerability Title
smb: client: mask server-provided mode to 07777 in modefromsid
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to 07777. Apply the correct masking, same as in the read path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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存在安全漏洞，该漏洞源于parse_dacl()函数在处理modefromsid时未对服务器提供的模式值进行掩码操作到07777，可能导致权限设置异常。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux e2f8fbfb8d09c06decde162090fac3ee220aa280 ~ 5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14 -
Linux Linux 5.4 -

II. Public POCs for CVE-2026-64379

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III. Intelligence Information for CVE-2026-64379

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Patches & Fixes for CVE-2026-64379 (7)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
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-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64320 9.1 CRITICAL nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64379

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