GHSA-3PRQ-7CQF-R4WW
Vulnerability from github – Published: 2026-07-24 18:31 – Updated: 2026-07-27 06:30In the Linux kernel, the following vulnerability has been resolved:
wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
Three BA session handlers use ffs(ba_data->sta_mask) - 1 to derive a station ID without checking that sta_mask is non-zero. When sta_mask is zero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing an out-of-bounds access on fw_id_to_link_sta[].
Add WARN_ON_ONCE(!ba_data->sta_mask) guards before each ffs() call, consistent with the existing check in iwl_mld_ampdu_rx_start().
{
"affected": [],
"aliases": [
"CVE-2026-64255"
],
"database_specific": {
"cwe_ids": [
"CWE-125"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-24T16:16:55Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers\n\nThree BA session handlers use ffs(ba_data-\u003esta_mask) - 1 to derive a\nstation ID without checking that sta_mask is non-zero. When sta_mask is\nzero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing\nan out-of-bounds access on fw_id_to_link_sta[].\n\nAdd WARN_ON_ONCE(!ba_data-\u003esta_mask) guards before each ffs() call,\nconsistent with the existing check in iwl_mld_ampdu_rx_start().",
"id": "GHSA-3prq-7cqf-r4ww",
"modified": "2026-07-27T06:30:31Z",
"published": "2026-07-24T18:31:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64255"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1de92789ce31e46fa7e7d8e89c90b19cdb1c103b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f056fc2b927448d37eca6b6cacc3d1b0f67b20d2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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