GHSA-F527-4PQF-X9G9
Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-18 18:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-90408"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:40Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event()\n\nThere is no policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT, so\nthe parse infrastructure does not enforce a minimum length for the event\nstruct. Additionally, the num_vdevs field is taken directly from firmware\nand used as a loop bound over the vdev_ids array without checking that it\nfits within the TLV payload. Either condition can cause an out-of-bounds\nread.\n\nAdd a TLV policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT so\nthe parse infrastructure enforces a minimum length for the fixed-size event\nstruct. Add a helper ath12k_wmi_tlv_data_len() to recover the payload\nlength of a parsed TLV from the header preceding its data pointer. Use it\nin ath12k_wmi_process_csa_switch_count_event() to bound num_vdevs before\nthe loop.\n\nCompile tested only.",
"id": "GHSA-f527-4pqf-x9g9",
"modified": "2026-09-18T18:31:31Z",
"published": "2026-09-17T18:32:04Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90408"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/878654eb78c6aa0ff585baf1376567c775ca28ec"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bf97c9d5123859a07848462539153176db029f3a"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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