What is CVE-2023-3867?

CVE-2023-3867 is a critical-severity vulnerability in Linux, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2025-08-16.

How severe is CVE-2023-3867?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2023-3867 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in Linux

CVE-2023-3867

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out of bounds read in smb2_sess_setup ksmbd does not consider the case of that smb2 session setup is in compound request. If this is the second payload of the compound, OOB read issue occurs while processing the first payload in the smb2_sess_setup().

Vulnerability class: Buffer Overflow

EPSS: 0.031 (86.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Linux — versions 6.1.40, 0626e6641f6b467447c81dd7678a69c66f7746cf, 5.15
Linux Linux_kernel

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2023-3867?: CVE-2023-3867 is a critical-severity vulnerability in Linux, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2025-08-16.
How severe is CVE-2023-3867?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2023-3867 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.