01 Record

CVE-2026-64399

ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE

CriticalPUBLISHEDCNA: Linux

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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02 Description

ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.49% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 41.9% of scored records. A rank, not a probability.
NVD base score: 9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status: Analyzed. NVD last modified this record on 2026-09-04.
Red Hat severity: Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-07-25 08:50Z3 MO AGO

Last updated

2026-08-17 04:54Z2 MO AGO

Reserved

2026-07-19

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-250Execution with Unnecessary PrivilegesBase

Data version

5.2

Document digest

f8cd4e2dbe455fd9e4935977c3474d7523a663cc033d7aa7ca6ad1beb4b6bac2

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxeb817368f50c1cbe1bd07044124aad7db6330e3a to < bf460ad5958d506492de4524a656439da3f99c51, eb817368f50c1cbe1bd07044124aad7db6330e3a to < 620d133d469295ee7c017ca6aafac335f65c4a5a, eb817368f50c1cbe1bd07044124aad7db6330e3a to < 9b9cf7e65cbeaae1b6636144bacee611cdd7a5d6, eb817368f50c1cbe1bd07044124aad7db6330e3a to < baae7b39673ec21073a25e3d14f8feaada01d5df, eb817368f50c1cbe1bd07044124aad7db6330e3a to < c917e4522d251071dde9871b9142d8ea1186ebfe, eb817368f50c1cbe1bd07044124aad7db6330e3a to < 388e4139db27a9e3612c9d356b826f5b1ff6a9e3, 5.15—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/bf460ad5958d506492de4524a656439da3f99c51
git.kernel.orghttps://git.kernel.org/stable/c/620d133d469295ee7c017ca6aafac335f65c4a5a
git.kernel.orghttps://git.kernel.org/stable/c/9b9cf7e65cbeaae1b6636144bacee611cdd7a5d6
git.kernel.orghttps://git.kernel.org/stable/c/baae7b39673ec21073a25e3d14f8feaada01d5df
git.kernel.orghttps://git.kernel.org/stable/c/c917e4522d251071dde9871b9142d8ea1186ebfe
git.kernel.orghttps://git.kernel.org/stable/c/388e4139db27a9e3612c9d356b826f5b1ff6a9e3

07 Fixed in

Debian 12

linux
Fixed in 6.1.180-1
linux-6.12
Fixed in 6.12.100-1~deb12u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.96-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 7.1.4-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.