Home/CVE/An issue was discovered in the Linux kernel before 6.3.8. fs/smb/server/smb2pdu.c in ksmbd has an integer underflow and
CVE

CVE-2023-38427

An issue was discovered in the Linux kernel before 6.3.8. fs/smb/server/smb2pdu.c in ksmbd has an integer underflow and

An issue was discovered in the Linux kernel before 6.3.8. fs/smb/server/smb2pdu.c in ksmbd has an integer underflow and out-of-bounds read in deassemble_neg_contexts.

CRITICAL · CVSS 9.8 EPSS 0.00095
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-125Out-of-bounds Read
CWE-125Out-of-bounds Read
CWE-191Integer Underflow (Wrap or Wraparound)
CWE-191Integer Underflow (Wrap or Wraparound)
▤

Affected Products & Versions

7
linux kernel>= 5.15 and < 5.15.145
linux kernel>= 5.16 and < 6.1.34
linux kernel>= 6.2 and < 6.3.8
netapp h300sall versions
netapp h410sall versions
netapp h500sall versions
netapp h700sall versions
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD18 Jul 2023 · 12:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

5
usnUSN-6725-2
usnUSN-6725-1
usnUSN-6466-1
usnUSN-6412-1
msrcCVE-2023-38427
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.8Release Notes
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/smb/server?id=f1a411873c85b642f13b01f21b534c2bab81fc1bPatch
https://security.netapp.com/advisory/ntap-20230824-0011/Third Party Advisory
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