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Linux Kernel CVE-2025-38456

HIGH
Out-of-bounds Write (CWE-787)
2025-07-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Buffer Overflow Linux Memory Corruption Debian Red Hat Debian Linux Suse
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.0 HIGH

Local low-priv access to the IPMI path (AV:L/PR:L); reaching the non-matching intf_num edge condition is race/state-dependent, so AC:H; kernel memory corruption yields full C/I/A impact.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
6.1 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 08:18 vuln.today
CVE Published
Jul 25, 2025 - 16:15 nvd
HIGH 7.8

DescriptionNVD

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

ipmi:msghandler: Fix potential memory corruption in ipmi_create_user()

The "intf" list iterator is an invalid pointer if the correct "intf->intf_num" is not found. Calling atomic_dec(&intf->nr_users) on and invalid pointer will lead to memory corruption.

We don't really need to call atomic_dec() if we haven't called atomic_add_return() so update the if (intf->in_shutdown) path as well.

AnalysisAI

Local privilege-escalation-class memory corruption in the Linux kernel's IPMI message handler (ipmi_msghandler) affects the ipmi_create_user() code path, where a list iterator that fails to match the requested intf->intf_num is left pointing at an invalid list-head-derived address and then passed to atomic_dec(&intf->nr_users), corrupting kernel memory. Local low-privileged users interacting with the IPMI subsystem can trigger the flaw, and with a CVSS of 7.8 (high) it threatens full confidentiality, integrity, and availability of the host. This is no public exploit identified at time of analysis, and the low EPSS (0.15%) reflects a niche, hardware-dependent subsystem rather than a mass-exploitation target.

Technical ContextAI

IPMI (Intelligent Platform Management Interface) is the out-of-band server management standard; the Linux kernel implements its userspace/driver plumbing in drivers/char/ipmi/ipmi_msghandler.c. The bug is a classic use of the list_for_each_entry() iterator anti-pattern: when the loop completes without finding a matching intf_num, the iterator variable does not hold a valid 'intf' object but instead an address computed from the list head, so any dereference or write through it is out-of-bounds. CWE-787 (Out-of-bounds Write) captures the root cause - atomic_dec(&intf->nr_users) writes to attacker-uncontrolled-but-invalid kernel memory. The fix also corrects the intf->in_shutdown path so atomic_dec() is not called when atomic_add_return() was never executed, keeping the reference-count accounting balanced.

RemediationAI

Patch available per vendor advisory - upgrade to a kernel build that includes the upstream fix from one of the five stable commits (e.g., git.kernel.org/stable/c/7c1a6ddb99858e7d68961f74ae27caeeeca67b6a and the matching backports for your series); the released patched version is distribution-specific, so exact tagged versions are not independently confirmed from the provided data. Debian users should apply the update referenced in https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html. If immediate patching is not possible, the most effective compensating control is to avoid loading the IPMI stack where it is not required: unload/blacklist the ipmi_msghandler and related ipmi_* modules (trade-off: disables in-band IPMI/BMC management and tooling such as ipmitool), or restrict access to IPMI device nodes (e.g., /dev/ipmi*) to trusted administrators only, since exploitation requires local interaction with this subsystem.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Container suse/hpc/warewulf4-x86_64/sle-hpc-node:15.6.17.8.116 Image SLES15-SP6 Image SLES15-SP6-BYOS Image SLES15-SP6-BYOS-Azure Image SLES15-SP6-BYOS-EC2 Image SLES15-SP6-BYOS-GCE Image SLES15-SP6-CHOST-BYOS Image SLES15-SP6-CHOST-BYOS-Aliyun Image SLES15-SP6-CHOST-BYOS-Azure Image SLES15-SP6-CHOST-BYOS-EC2 Image SLES15-SP6-CHOST-BYOS-GCE Image SLES15-SP6-CHOST-BYOS-GDC Image SLES15-SP6-CHOST-BYOS-SAP-CCloud Image SLES15-SP6-EC2 Image SLES15-SP6-EC2-ECS-HVM Image SLES15-SP6-GCE Image SLES15-SP6-HPC-BYOS Image SLES15-SP6-HPC-BYOS-Azure Image SLES15-SP6-HPC-BYOS-EC2 Image SLES15-SP6-HPC-BYOS-GCE Image SLES15-SP6-HPC-EC2 Image SLES15-SP6-HPC-GCE Image SLES15-SP6-Hardened-BYOS Image SLES15-SP6-Hardened-BYOS-Azure Image SLES15-SP6-Hardened-BYOS-EC2 Image SLES15-SP6-Hardened-BYOS-GCE Image SLES15-SP6-SAP Image SLES15-SP6-SAP-Azure Image SLES15-SP6-SAP-EC2 Image SLES15-SP6-SAP-GCE Image SLES15-SP6-SAPCAL Image SLES15-SP6-SAPCAL-Azure Image SLES15-SP6-SAPCAL-EC2 Image SLES15-SP6-SAPCAL-GCE Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.57 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.40 Image SL-Micro Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.80 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.41 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.95 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.34 Affected
Image SLES-Azure-3P Image SLES-Azure-Basic Image SLES-Azure-Standard Image SLES-BYOS-Azure Image SLES-BYOS-EC2 Image SLES-BYOS-GCE Image SLES-CHOST-BYOS-Aliyun Image SLES-CHOST-BYOS-Azure Image SLES-CHOST-BYOS-EC2 Image SLES-CHOST-BYOS-GCE Image SLES-CHOST-BYOS-GDC Image SLES-CHOST-BYOS-SAP-CCloud Image SLES-EC2 Image SLES-EC2-ECS Image SLES-GCE Image SLES-GCE-3P Image SLES-Hardened-BYOS-Azure Image SLES-Hardened-BYOS-EC2 Image SLES-Hardened-BYOS-GCE Image SLES-SAPCAL-Azure Image SLES-SAPCAL-EC2 Image SLES-SAPCAL-GCE Affected

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CVE-2025-38456 vulnerability details – vuln.today
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