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Linux Kernel CVE-2026-46226

| EUVDEUVD-2026-32853 MEDIUM
2026-05-28 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-h384-m94j-8hmh
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
    Gain local low-privilege shell on FSL SPI-equipped system
  2. Delivery
    Identify fsl-spi driver bound to controller via sysfs
  3. Exploit
    Write to sysfs unbind interface to trigger driver detach
  4. Execution
    Kernel releases DMA resources before controller deregistration
  5. Persist
    In-flight or subsequent SPI access dereferences freed memory
  6. Impact
    Kernel panic causes denial of service

Vulnerability Assessment

Exploitation Conditions

Exploitation requires: (1) the target system has Freescale/NXP SPI controller hardware with the fsl-spi kernel driver loaded and active; (2) the attacker has local authenticated access with at minimum low-privilege user credentials (CVSS PR:L); (3) the attacker can trigger driver unbind, either through sysfs (requires write permission to the unbind interface) or hardware hot-unplug events. No network access is required - this is a strictly local attack (CVSS AV:L). Exploitation is further bounded by hardware availability: this driver is not present on general-purpose x86 servers or desktops, limiting exposure to embedded, industrial, and automotive Linux deployments on FSL/NXP silicon.
Impact

CVSS 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) correctly frames this as a local, low-complexity issue requiring only low privileges, with impact limited to availability - specifically a kernel crash or resource corruption during SPI driver unbind. The EPSS score of 0.02% (5th percentile) is consistent with its narrow attack surface: exploitation requires FSL SPI hardware, the driver loaded, and the ability to trigger a driver unbind. The vulnerability is NOT listed in CISA KEV. One data quality note: the EUVD tag 'Information Disclosure' conflicts with the CVSS C:N (no confidentiality impact) - this tag appears mislabeled and should not be used to elevate concern. Overall, this is a genuine but low-priority issue: real-world risk is bounded to embedded/industrial Linux systems using Freescale SPI controllers, and exploitation does not yield code execution.
Exploit ScenarioDerived

A local user with low privileges on an embedded Linux system using a Freescale SPI controller (e.g., an NXP i.MX or PowerPC-based board) writes to the sysfs driver unbind interface to detach the fsl-spi driver. The kernel releases DMA resources before deregistering the SPI controller; a concurrent or subsequent in-flight SPI transfer references the freed DMA descriptor, resulting in a kernel NULL dereference or use-after-free and crashing the system. No public proof-of-concept exploit code 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

Improper driver teardown ordering in the Linux kernel's Freescale (FSL) SPI controller driver allows a local low-privileged user to trigger a denial-of-service condition during driver unbind. The SPI controller is not deregistered before underlying resources such as DMA are released, creating a window where the controller may reference freed memory. No public exploit has been identified at time of analysis, and EPSS sits at 0.02% (5th percentile), reflecting low real-world exploitation probability.

RemediationAI

Upgrade to a patched stable kernel release: 6.6.140, 6.12.90, 7.0.9, 6.18.32, or 7.1-rc1. The upstream fix commits are available via kernel.org stable trees at https://git.kernel.org/stable/c/562d954a144950ec2aa6a874ae657cb3fa31fe53, https://git.kernel.org/stable/c/5750743a39c9d46ac9fcf57ffe000956da4942cf, https://git.kernel.org/stable/c/9b7abfed4c3754062d1f3ffd452e65a38667f586, https://git.kernel.org/stable/c/ca3195c7b88362d7c81efe685948663a9f9db0e6, and https://git.kernel.org/stable/c/e888308222375ac28bae69134dae288178718a96. As a compensating control on systems where upgrading is not immediately feasible, prevent unprivileged users from triggering driver unbind by restricting write access to the relevant sysfs unbind interface (e.g., /sys/bus/platform/drivers/fsl_spi/unbind) via DAC or mandatory access control policy such as SELinux or AppArmor. This limits the attack surface to root or privileged processes only, though it does not eliminate the underlying race.

Affected VersionsENISA

Linux 4178b6b1b595003cd6e04711b449797a582e44f5 <e888308222375ac28bae69134dae288178718a96
Linux patch: 6.12.90
Linux 4178b6b1b595003cd6e04711b449797a582e44f5 <9b7abfed4c3754062d1f3ffd452e65a38667f586
Linux 4178b6b1b595003cd6e04711b449797a582e44f5 <ca3195c7b88362d7c81efe685948663a9f9db0e6
Linux patch: 7.0.9
Linux patch: 6.18.32
Linux 4178b6b1b595003cd6e04711b449797a582e44f5 <562d954a144950ec2aa6a874ae657cb3fa31fe53
Linux 4.3
Linux patch: 7.1-rc1
Linux patch: 6.6.140
Linux 4178b6b1b595003cd6e04711b449797a582e44f5 <5750743a39c9d46ac9fcf57ffe000956da4942cf
Linux patch: 0

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 affected component is the spi/fsl driver in the Linux kernel, which manages Freescale/NXP SPI (Serial Peripheral Interface) controllers common on embedded and industrial platforms. During driver unbind (e.g., hot-unplug or manual sysfs removal), the correct teardown order requires deregistering the SPI controller - causing the kernel SPI core to cease dispatching transfers - before releasing DMA channels and other hardware resources. The bug inverts this order, releasing DMA before the controller is deregistered. This constitutes a resource lifecycle ordering flaw (analogous to CWE-416 Use After Free or CWE-459 Incomplete Cleanup, though NVD lists CWE as N/A). CPE data confirms the affected product is cpe:2.3:o:linux:linux_kernel and the vulnerability traces to the introduction of commit 4178b6b1b595003cd6e04711b449797a582e44f5 (present since Linux 4.3).

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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 - 19:07 NVD
5.5 (MEDIUM)
Patch available
May 28, 2026 - 12:01 EUVD
CVE Published
May 28, 2026 - 10:16 nvd
MEDIUM 5.5
CVE Published
May 28, 2026 - 10:16 nvd
UNKNOWN (no severity yet)

DescriptionNVD

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

spi: fsl: fix controller deregistration

Make sure to deregister the controller before releasing underlying resources like DMA 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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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-2026-46226 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/366661 REF https://git.kernel.org/stable/c/562d954a144950ec2aa6a874ae657cb3fa31fe53 REF https://git.kernel.org/stable/c/5750743a39c9d46ac9fcf57ffe000956da4942cf REF https://git.kernel.org/stable/c/9b7abfed4c3754062d1f3ffd452e65a38667f586 REF https://git.kernel.org/stable/c/af8ba212fdc985b7853e8aff3fd2ca65f94aafc9 REF https://git.kernel.org/stable/c/ca3195c7b88362d7c81efe685948663a9f9db0e6 REF https://git.kernel.org/stable/c/e888308222375ac28bae69134dae288178718a96

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