CVE-2026-64255 Details
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().
A vulnerability in the Linux kernel's iwlwifi driver can lead to an out-of-bounds access issue. This occurs in three Block Ack (BA) session handlers that improperly derive a station ID from the 'sta_mask' variable without first validating that it is non-zero. When 'sta_mask' is zero, the function 'ffs()' returns 0, and the subsequent subtraction wraps around to 0xFFFFFFFF, causing an out-of-bounds access on the 'fw_id_to_link_sta' array. The vulnerability has been addressed by adding warnings to ensure 'sta_mask' is checked before it is used, preventing the out-of-bounds access.
Users can update to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for updating the kernel can be found in the official Linux kernel documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/1de92789ce31e46fa7e7d8e89c90b19cdb1c103b | kernel.org | Patch |
| https://git.kernel.org/stable/c/f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 | kernel.org | Patch |
| https://git.kernel.org/stable/c/fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.4, < 6.18.38 >= 6.19, < 7.1.3 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 17, 2026 | CVE Modified | kernel.org |
| Aug 12, 2026 | Initial Analysis | [email protected] |
| Jul 27, 2026 | CVE Modified | kernel.org |
| Jul 24, 2026 | New CVE Received | kernel.org |