CVE-2026-64255
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().
SeverityHigh
CVSS8.8
Exploit probability—
Product
Linux Kernel
PublishedJul 24, 2026
First seenJul 24, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- linux linux_kernel6.18.38, 7.1.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.4 ≤ v < 6.18.38, 6.19 ≤ v < 7.1.3 | 6.18.38, 7.1.3 |
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