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Linux Kernel CVE-2025-38501

HIGH
Uncontrolled Resource Consumption (CWE-400)
2025-08-16 416baaa9-dc9f-4396-8d5f-8c081fb06d67
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 17, 2026 - 20:45 vuln.today
Patch released
Mar 17, 2026 - 20:45 nvd
Patch available
CVE Published
Aug 16, 2025 - 06:15 nvd
HIGH 7.5

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: limit repeated connections from clients with the same IP

Repeated connections from clients with the same IP address may exhaust the max connections and prevent other normal client connections. This patch limit repeated connections from clients with the same IP.

AnalysisAI

The ksmbd file server in the Linux kernel is vulnerable to a connection exhaustion denial-of-service attack where a malicious actor can repeatedly establish connections from the same IP address to exhaust available connection slots, preventing legitimate clients from connecting. A proof-of-concept exploit tool called 'KSMBDrain' is publicly available on GitHub, demonstrating active weaponization of this vulnerability. The EPSS score of 0.02% indicates very low observed exploitation in the wild despite POC availability, though the CVSS score of 7.5 (High) reflects significant availability impact.

Technical ContextAI

ksmbd is an in-kernel SMB server implementation for the Linux kernel that provides file sharing services. The vulnerability stems from CWE-400 (Uncontrolled Resource Consumption), where the server fails to implement proper connection rate limiting or per-IP connection quotas. Affected products include multiple Linux kernel versions as indicated by CPE strings for linux:linux_kernel and debian:debian_linux 11.0. Without connection limiting controls, an attacker can monopolize the server's connection pool by establishing numerous connections from a single source IP, leading to resource exhaustion that blocks legitimate users from accessing the service.

RemediationAI

Apply the available kernel patches from the Linux stable tree immediately. Six patches are available at https://git.kernel.org/stable/c/6073afe64510c302b7a0683a01e32c012eff715d, https://git.kernel.org/stable/c/7e5d91d3e6c62a9755b36f29c35288f06c3cd86b, https://git.kernel.org/stable/c/cb092fc3a62972a4aa47c9fe356c2c6a01cd840b, https://git.kernel.org/stable/c/e6bb9193974059ddbb0ce7763fa3882bd60d4dc3, https://git.kernel.org/stable/c/f1ce9258bcbce2491f9f71f7882b6eed0b33ec65, and https://git.kernel.org/stable/c/fa1c47af4ff641cf9197ecdb1f8240cbb30389c1. Debian users should follow the guidance at https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html. As an interim mitigation, implement network-level rate limiting or firewall rules to restrict connection attempts per source IP, or consider disabling ksmbd and using alternative file sharing solutions until patching is complete.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2025-38501 vulnerability details – vuln.today

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