CVE-2023-3865 | ksmbd: fix out-of-bound read in smb2_write

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out-of-bound read in smb2_write ksmbd_smb2_check_message doesn't validate hdr->NextCommand. If ->NextCommand is bigger than Offset + Length of smb2 write, It will allow oversized smb2 write length. It will cause OOB read in smb2_write.

Published: 2025-08-16 Last update: 2025-11-18 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-3865 is rated Moderate Risk (42.7/100): CVSS High severity, with low exploitation likelihood (EPSS 0.51%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-3865

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.05% 0.51% +0.46%
2 2025-08-21 0.05% 0.05% -0.00%
3 2025-08-19 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-3865

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.2 [email protected]

Weakness enumeration for CVE-2023-3865

OS Trackers for CVE-2023-3865

vendor priority summary link
debian unimportant CVE-2023-3865 unimportant priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-3865
redhat high — https://access.redhat.com/security/cve/CVE-2023-3865
suse high CVE-2023-3865 severity important: SUSE including 13 source package names (kernel-default, kernel-default-base, …), 212 product×package rows across 48 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7.1, … (48 product lines)): Known Not Affected 212. https://www.suse.com/security/cve/CVE-2023-3865/
ubuntu medium CVE-2023-3865 medium priority: Ubuntu including 167 source packages (linux, linux-allwinner, …), 1873 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1428, released 165, not-affected 163, ignored 117. https://ubuntu.com/security/CVE-2023-3865

Affected software / configurations for CVE-2023-3865

Vendor Product Version Raw CPE
linux linux_kernel >= 5.15, < 5.15.121 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.16, < 6.1.36 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.2, < 6.3.10 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel 6.4 cpe:2.3:o:linux:linux_kernel:6.4:rc1:*:*:*:*:*:*
linux linux_kernel 6.4 cpe:2.3:o:linux:linux_kernel:6.4:rc2:*:*:*:*:*:*
linux linux_kernel 6.4 cpe:2.3:o:linux:linux_kernel:6.4:rc3:*:*:*:*:*:*
linux linux_kernel 6.4 cpe:2.3:o:linux:linux_kernel:6.4:rc4:*:*:*:*:*:*
linux linux_kernel 6.4 cpe:2.3:o:linux:linux_kernel:6.4:rc5:*:*:*:*:*:*
linux linux_kernel 6.4 cpe:2.3:o:linux:linux_kernel:6.4:rc6:*:*:*:*:*:*
linux linux_kernel 6.4 cpe:2.3:o:linux:linux_kernel:6.4:rc7:*:*:*:*:*:*

References for CVE-2023-3865

cvelogic Threat Intelligence