wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90408
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:40 UTC
Updated2026-09-18 18:17:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event() There is no policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT, so the parse infrastructure does not enforce a minimum length for the event struct. Additionally, the num_vdevs field is taken directly from firmware and used as a loop bound over the vdev_ids array without checking that it fits within the TLV payload. Either condition can cause an out-of-bounds read. Add a TLV policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT so the parse infrastructure enforces a minimum length for the fixed-size event struct. Add a helper ath12k_wmi_tlv_data_len() to recover the payload length of a parsed TLV from the header preceding its data pointer. Use it in ath12k_wmi_process_csa_switch_count_event() to bound num_vdevs before the loop. Compile tested only.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001550000 probability, percentile 0.050900000 (date 2026-09-18)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.7HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d889913205cf7ebda905b1e62c5867ed4e39f6c2 bf97c9d5123859a07848462539153176db029f3a git Not specified
CNA Linux Linux affected d889913205cf7ebda905b1e62c5867ed4e39f6c2 878654eb78c6aa0ff585baf1376567c775ca28ec git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/878654eb78c6aa0ff585baf1376567c775ca28ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf97c9d5123859a07848462539153176db029f3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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