Out-of-bounds Read in Linux Kernel
CVE-2023-38431
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.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.012 (66.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.8 (Release Notes)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/smb/server (Patch)
- security.netapp.com/advisory/ntap-20230824-0011/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-38431?
- CVE-2023-38431 is a critical-severity vulnerability in Linux Kernel, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2023-07-18.
- How severe is CVE-2023-38431?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2023-38431 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.