counter: rz-mtu3-cnt: do not use struct rz_mtu3_channel's dev member

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Summary

CVECVE-2026-31740
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:36 UTC
Updated2026-05-07 19:56:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: counter: rz-mtu3-cnt: do not use struct rz_mtu3_channel's dev member The counter driver can use HW channels 1 and 2, while the PWM driver can use HW channels 0, 1, 2, 3, 4, 6, 7. The dev member is assigned both by the counter driver and the PWM driver for channels 1 and 2, to their own struct device instance, overwriting the previous value. The sub-drivers race to assign their own struct device pointer to the same struct rz_mtu3_channel's dev member. The dev member of struct rz_mtu3_channel is used by the counter sub-driver for runtime PM. Depending on the probe order of the counter and PWM sub-drivers, the dev member may point to the wrong struct device instance, causing the counter sub-driver to do runtime PM actions on the wrong device. To fix this, use the parent pointer of the counter, which is assigned during probe to the correct struct device, not the struct device pointer inside the shared struct rz_mtu3_channel.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.048290000 (date 2026-05-05)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a 28a371be901ef44ee03726c2575d7d6795521fe0 git Not specified
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a 633dfbf0eb2766c597c1a59dd83035c82e14791d git Not specified
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a 6562290225c197e2e193a53de2a517815288dcd1 git Not specified
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a 63be324c795262f0e316c6fe9b329d83afa1ec93 git Not specified
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a 2932095c114b98cbb40ccf34fc00d613cb17cead git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/63be324c795262f0e316c6fe9b329d83afa1ec93 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6562290225c197e2e193a53de2a517815288dcd1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/28a371be901ef44ee03726c2575d7d6795521fe0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2932095c114b98cbb40ccf34fc00d613cb17cead 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/633dfbf0eb2766c597c1a59dd83035c82e14791d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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