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Linux Kernel CVE-2025-38429

MEDIUM
Use of Uninitialized Resource (CWE-908)
2025-07-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Information Disclosure Linux Red Hat Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.3 MEDIUM

Race condition requires favorable timing (AC:H); partial data corruption in ring buffer justifies I:L alongside A:H for potential crash.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
5.8 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:L/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
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 08:51 vuln.today
CVE Published
Jul 25, 2025 - 15:15 nvd
MEDIUM 5.5

DescriptionNVD

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

bus: mhi: ep: Update read pointer only after buffer is written

Inside mhi_ep_ring_add_element, the read pointer (rd_offset) is updated before the buffer is written, potentially causing race conditions where the host sees an updated read pointer before the buffer is actually written. Updating rd_offset prematurely can lead to the host accessing an uninitialized or incomplete element, resulting in data corruption.

Invoke the buffer write before updating rd_offset to ensure the element is fully written before signaling its availability.

AnalysisAI

Race condition in the Linux kernel's MHI (Mobile Host Interface) endpoint driver allows a local low-privileged user to trigger data corruption by exploiting a premature read pointer update in mhi_ep_ring_add_element. Specifically, rd_offset is advanced before the ring buffer element is fully written, allowing the remote host to read uninitialized or incomplete data from the MHI ring - resulting in data corruption and potential availability loss. No public exploit identified at time of analysis; four stable-branch patches are available at kernel.org.

Technical ContextAI

MHI (Mobile Host Interface) is a bus protocol defined by Qualcomm for PCIe-based host-to-modem (and similar peripheral) communication. The Linux kernel implements an endpoint-side MHI driver under drivers/bus/mhi/ep/. The vulnerable function mhi_ep_ring_add_element manages producer-consumer ring buffers shared between the endpoint and host. CWE-908 (Use of Uninitialized Resource) is the root cause class: the rd_offset (read pointer) is updated to signal element availability to the host before the buffer write operation completes, creating a memory ordering hazard. The host, observing the advanced pointer, may dereference and process a ring element that contains stale, uninitialized, or partially-written data. Affected product is the Linux kernel across multiple stable branches (CPE: cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*).

RemediationAI

Apply the upstream fix by updating to a patched Linux kernel version containing one of the four stable-branch commits: 0007ef098dab48f1ba58364c40b4809f1e21b130, 44b9620e82bbec2b9a6ac77f63913636d84f96dc, 6f18d174b73d0ceeaa341f46c0986436b3aefc9a, or f704a80d9fa268e51a6cc5242714502c3c1fa605, all available at https://git.kernel.org/stable/. Distribution maintainers (e.g., RHEL, Ubuntu, Debian, SUSE) should be consulted for backport status to distribution kernels. If immediate kernel update is not feasible and MHI endpoint functionality is not required, unloading or blacklisting the mhi_ep kernel module (modprobe -r mhi_ep; echo 'blacklist mhi_ep' >> /etc/modprobe.d/blacklist.conf) eliminates the attack surface with no impact on unrelated system functions. If the MHI endpoint driver is required, restrict local system access to trusted users as a compensating control, noting this only raises the bar rather than eliminating the race.

Same weakness CWE-908 – Use of Uninitialized Resource

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Container suse/hpc/warewulf4-x86_64/sle-hpc-node:15.6.17.8.103 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:2.1.3-7.44 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.27 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:2.1.3-6.67 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.29 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.76 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.14 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-2025-38429 vulnerability details – vuln.today
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