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CVE-2023-38430

28
FAUCET Score

CVE-2023-38430 is a critical out-of-bounds read vulnerability affecting the ksmbd module in Linux kernel versions prior to 6.3.9, including NetApp products. This flaw, stemming from insufficient validation of SMB request protocol IDs, allows unauthenticated remote attackers to achieve high confidentiality and availability impact. While no public exploits or active exploitation are currently confirmed, the vulnerability has a CVSS score of 9.1 (Critical) and has garnered significant community discussion, indicating potential interest.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.15, < 5.15.145CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 5.16, < 6.1.35CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.2, < 6.3.9CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.16%
Probability of exploitation in next 30 days
EPSS Percentile
63.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0116 is in the 50th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

microsoftpatch availablevia msrc
Product: cm1 kernel 5.10.188.1-1 on CBL Mariner 1.0Fixed in: 5.10.188.1-1
microsoftpatch availablevia msrc
Product: cbl2 kernel 5.15.122.1-2 on CBL Mariner 2.0Fixed in: 5.15.122.1-2
microsoftpatch availablevia msrc
Product: 17823-16820Fixed in: 5.10.188.1-1
microsoftpatch availablevia msrc
Product: 17824-16823Fixed in: 5.15.122.1-2

Vendor Advisories (1)

microsoft2023-Jul/CVE-2023-38430Critical

An issue was discovered in the Linux kernel before 6.3.9. ksmbd does not validate the SMB request protocol ID leading to an out-of-bounds read.

Jul 11, 2023

References

cdn.kernel.org / pub/linux/kernel/v6.x/ChangeLog-6.3.9
Release Notes
git.kernel.org / pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/smb/server
Patch
security.netapp.com / advisory/ntap-20230831-0003
Third Party Advisory