Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-64255

Severity CVSS v4.0:
Pending analysis
Type:
CWE-125 Out-of-bounds Read
Publication date:
24/07/2026
Last modified:
17/08/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers<br /> <br /> Three BA session handlers use ffs(ba_data-&gt;sta_mask) - 1 to derive a<br /> station ID without checking that sta_mask is non-zero. When sta_mask is<br /> zero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing<br /> an out-of-bounds access on fw_id_to_link_sta[].<br /> <br /> Add WARN_ON_ONCE(!ba_data-&gt;sta_mask) guards before each ffs() call,<br /> consistent with the existing check in iwl_mld_ampdu_rx_start().

Impact

Vector 3.x
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
8.80
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.4 (including) 6.18.38 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.19 (including) 7.1.3 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools