Medium [CVE-2026-64255] validate sta_mask before ffs in BA session handlers
This medium-severity Red Hat Linux advisory covers CVE-2026-64255 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
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 flaw was found in the Linux kernel's iwlwifi (Intel Wireless WiFi) driver. This vulnerability allows an attacker to cause an out-of-bounds memory access in the WiFi Block Acknowledgement (BA) session handlers.
This occurs when the `sta_mask` value is zero, leading to an incorrect station ID calculation and potential system instability or denial of service.
This vulnerability is evaluated as having Moderate severity because exploitation requires systems equipped with physical Intel Wi-Fi hardware supporting multi-link device operations, which are uncommon in standard enterprise server environments.
An attacker requires local access or adjacent wireless proximity to interact with active block acknowledgment sessions to trigger the out-of-bounds condition.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 3 days ago·verify at source
- kernel-0:6.12.0-211.53.1.el10_2
- kernel-0:5.14.0-687.47.1.el9_8
- RHSA-2026:65334
- RHSA-2026:67150
Official advisory · high-confidence parse· fetched 3 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 3 days ago·verify at source
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