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Linux Kernel CVE-2026-46200

| EUVDEUVD-2026-32827 MEDIUM
2026-05-28 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-pxf3-q4jm-4wrr
Information Disclosure Linux
5.5
CVSS 3.1 · NVD
View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Authenticate as low-privilege local user
  2. Delivery
    Identify active MPC52xx SPI controller binding
  3. Exploit
    Trigger driver unbind (device removal or module unload)
  4. Execution
    Race condition: kernel accesses freed IRQ/GPIO during teardown
  5. Persist
    Kernel dereferences invalid resource pointer
  6. Impact
    Kernel panic / system denial of service

Vulnerability Assessment

Exploitation Conditions

Exploitation requires local access with at minimum low-privilege credentials (CVSS PR:L) on a system running Linux on MPC52xx PowerPC SoC hardware with the spi-mpc52xx kernel module loaded and bound to an SPI controller. The triggering condition is driver unbind during active resource use - either via physical device removal, module unload, or hotplug event. Exploitation is limited by: hardware specificity (MPC52xx PowerPC SoC only, not general x86/ARM Linux), requirement for local authenticated access, and the need to race the teardown window. Systems without MPC52xx hardware are entirely unaffected regardless of kernel version.
Impact

CVSS 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) accurately describes a local, low-privilege denial-of-service with no confidentiality or integrity impact. The EPSS score of 0.02% (5th percentile) reinforces that exploitation is rare or theoretical. This vulnerability is not listed in the CISA KEV catalog and no public exploit or POC has been identified. The 'Information Disclosure' tag present in the source intelligence is inconsistent with the CVSS vector (C:N) - this appears to be a mis-tagging; the actual impact is availability-only (kernel panic/DoS). Practical exploitation is further constrained by hardware scope: only systems running MPC52xx PowerPC SoC hardware are affected, a niche embedded platform. This is a real but low-priority issue for most organizations - it becomes relevant only for embedded Linux deployments on MPC52xx hardware where untrusted local users exist or automated device hotplug is exposed.
Exploit ScenarioDerived

A local attacker with low-privilege access on a PowerPC system using MPC52xx SPI hardware triggers a driver unbind - either by removing the physical device, unloading the kernel module (if permitted), or causing a hotplug event - during active SPI bus activity. The racing teardown sequence causes the kernel to dereference a freed interrupt or GPIO resource, producing a kernel panic and system reboot. No public exploit or POC exists at time of analysis.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jun 10, 2026

Denial-of-service via improper resource teardown ordering in the Linux kernel's MPC52xx SPI controller driver (spi/mpc52xx) affects systems running PowerPC-based embedded hardware. During driver unbind, the SPI controller was deregistered after - rather than before - disabling underlying resources such as interrupts and GPIOs, creating a window where the kernel could access freed or disabled resources and trigger a system crash. No public exploit has been identified at time of analysis, and with an EPSS of 0.02% (5th percentile), real-world exploitation is assessed as very low probability.

RemediationAI

Upgrade to a patched Linux kernel version: 6.12.90 or later for the 6.12.x stable series, 7.0.9 or later for the 7.0.x series, 6.18.32 or later for the 6.18.x series, or 7.1-rc1 or later for mainline. The upstream fix commits are available at https://git.kernel.org/stable/c/0f997fdae819a8c2cc83bd4ff7d935ad76c727c9, https://git.kernel.org/stable/c/28f28a0f4e327f792c230493a0ea00389ff68ff5, https://git.kernel.org/stable/c/7fea80d93bfd34051b2ac1cec07766c87d8d28be, and https://git.kernel.org/stable/c/a3669f678d0ee8b686d3eea4c0ed9817c9374945. As a compensating control on systems that cannot be patched immediately, preventing unprivileged users from triggering device removal or module unloading (e.g., restricting udev rules and module management to root only) reduces exploitation surface. Note this control does not eliminate risk from automated hotplug events or physical device removal.

Affected VersionsENISA

Linux patch: 7.1-rc1
Linux patch: 6.18.32
Linux patch: 7.0.9
Linux 42bbb70980f3720b0ae6da6af862af0e95a04351 <0f997fdae819a8c2cc83bd4ff7d935ad76c727c9
Linux 42bbb70980f3720b0ae6da6af862af0e95a04351 <7fea80d93bfd34051b2ac1cec07766c87d8d28be
Linux patch: 6.12.90
Linux 2.6.33
Linux patch: 0
Linux 42bbb70980f3720b0ae6da6af862af0e95a04351 <28f28a0f4e327f792c230493a0ea00389ff68ff5
Linux 42bbb70980f3720b0ae6da6af862af0e95a04351 <a3669f678d0ee8b686d3eea4c0ed9817c9374945

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Technical ContextAI · show details

The MPC52xx SPI controller driver (drivers/spi/spi-mpc52xx.c) targets Freescale/NXP MPC52xx PowerPC system-on-chip hardware. The defect is a driver lifecycle ordering error: on module unbind or device removal, the kernel must deregister the SPI controller before tearing down hardware resources (IRQs, GPIOs). The original code reversed this order, meaning in-flight SPI bus activity or callbacks could reference already-disabled interrupt lines or released GPIO descriptors, resulting in a null/dangling pointer dereference and kernel panic. While CWE is not formally assigned, the root cause aligns with CWE-416 (Use After Free) or CWE-362 (Race Condition) class defects triggered during hardware abstraction layer teardown. Affected CPEs are cpe:2.3:o:linux:linux_kernel across multiple stable branches from 2.6.33 onward through the patched commits.

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  • Exploit and PoC references, threat intelligence from 22 sources
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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
SUSE MEDIUM

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

4
CVSS changed
Jun 10, 2026 - 17:22 NVD
5.5 (MEDIUM)
Patch available
May 28, 2026 - 12:01 EUVD
CVE Published
May 28, 2026 - 10:16 nvd
UNKNOWN (no severity yet)
CVE Published
May 28, 2026 - 10:16 nvd
MEDIUM 5.5

DescriptionNVD

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

spi: mpc52xx: fix controller deregistration

Make sure to deregister the controller before disabling and releasing underlying resources like interrupts and gpios during driver unbind.

Threat Intelligence Overview

EPSS Score
0.0%
Top 95% exploitable
Data Quality
6 sources
Confidence: High
EUVD NVD CVE.org EPSS MSRC Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Same technique Information Disclosure

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CVE-2025-68613 HIGH POC
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CVE-2015-1701 HIGH POC
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CVE-2017-0147 HIGH POC
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-46200 ADVISORY https://ubuntu.com/security/notices/USN-8566-1 ADVISORY https://ubuntu.com/security/notices/USN-8567-1 ADVISORY https://ubuntu.com/security/notices/USN-8568-1 ADVISORY https://vuldb.com/vuln/366653 REF https://git.kernel.org/stable/c/0f997fdae819a8c2cc83bd4ff7d935ad76c727c9 REF https://git.kernel.org/stable/c/28f28a0f4e327f792c230493a0ea00389ff68ff5 REF https://git.kernel.org/stable/c/7fea80d93bfd34051b2ac1cec07766c87d8d28be REF https://git.kernel.org/stable/c/a3669f678d0ee8b686d3eea4c0ed9817c9374945 REF https://git.kernel.org/stable/c/c6e3b9f5dcb80fe4d3f1e470f79a91a3cc526cee REF https://git.kernel.org/stable/c/ff2979c57b70be6d8b64e40d7b4217341a877fcd

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