CVE-2023-38431 in the critical feed json
An issue was discovered in the Linux kernel before 6.3.8.
published 2023-07-17 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-42248
- cvss
- 9.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
An issue was discovered in the Linux kernel before 6.3.8. fs/smb/server/connection.c in ksmbd does not validate the relationship between the NetBIOS header's length field and the SMB header sizes, via pdu_size in ksmbd_conn_handler_loop, leading to an out-of-bounds read.
Patch / fix
- linux linux_kernel 5.15.145, 6.1.34, 6.3.8
- linux Debian 12 6.1.37-1
- linux Debian 14, Debian 13 6.3.11-1
debian advisories DEBIAN-CVE-2023-38431
- linux Ubuntu 22.04 LTS 5.15.0-102.112
- linux-aws Ubuntu 22.04 LTS 5.15.0-1057.63
- linux-gcp Ubuntu 22.04 LTS 5.15.0-1055.63
- linux-gke Ubuntu 22.04 LTS 5.15.0-1054.59
- linux-ibm Ubuntu 22.04 LTS 5.15.0-1050.53
- linux-kvm Ubuntu 22.04 LTS 5.15.0-1054.59
- linux-azure Ubuntu 22.04 LTS 5.15.0-1060.69
- linux-gkeop Ubuntu 22.04 LTS 5.15.0-1040.46
ubuntu advisories UBUNTU-CVE-2023-38431
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Exploit prediction
1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
- Technology feeds
References
Sources
- CVE List CVE-2023-38431
- NVD CVE-2023-38431
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.