CVE-2026-64255 | In the Linux kernel, the following vulnerability has been re… | CVSS 8.8 HIGH

Description

In 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().

Metadata

CVE ID: CVE-2026-64255
State: PUBLISHED
Assigner: Linux
Reserved: 2026-07-19 15:36 UTC
Published: 2026-07-24 15:31 UTC
Last updated: 2026-07-27 04:59 UTC
Vendor / Product: Linux / Linux
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

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

Affected products (2)

Vendor	Product	Platform	Versions
Linux	Linux	—	9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b < 1de92789ce31e46fa7e7d8e89c90b19cdb1c103b, 9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b < fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc, 9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b < f056fc2b927448d37eca6b6cacc3d1b0f67b20d2
Linux	Linux	—	6.4, 0 < 6.4, 6.18.38 ≤ 6.18., 7.1.3 ≤ 7.1. …

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (3)