8.1

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

Modified
AliasesUBUNTU-CVE-2023-3865DEBIAN-CVE-2023-3865
Published 16-08-2025Last modified 15-08-2026

Vulnerability summary

CVE-2023-3865 is a high (CVSS 8.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 50.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.63%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 8
USN-6416-1USN-6416-2USN-6416-3USN-6445-1USN-6445-2USN-6464-1

Timeline

  1. 16-08-2025
    PublishedVulnerability first disclosed.
  2. 15-08-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.63%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.60% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu91 products
  • linux< 5.15.0-86.96
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1047.52
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 3813eee5154d6a4c5875cb4444cb2b63bac8947f | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < c86211159bc3178b891e0d60e586a32c7b6a231b | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 58a9c41064df27632e780c5a3ae3e0e4284957d1 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 5fe7f7b78290638806211046a99f031ff26164e1 | 5.15
  • linux_kernel≥ 5.15, < 5.15.121 | ≥ 5.16, < 6.1.36 | ≥ 6.2, < 6.3.10 | 6.4:rc1 | 6.4:rc2 | 6.4:rc3 | 6.4:rc4 | 6.4:rc5 | 6.4:rc6 | 6.4:rc7
Debian1 product
  • linux< 6.1.37-1 | < 6.3.11-1

3 vendors · 94 products

References

18 links
Show all 18 references