CVE-2026-64255wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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().
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b builds before 1de92789ce31e46fa7e7d8e89c90b19cdb1c103b; from 9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b before fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc; from 9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b before f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.4 before 6.18.38; from 6.19 before 7.1.3 | NVD |
References
- https://git.kernel.org/stable/c/1de92789ce31e46fa7e7d8e89c90b19cdb1c103bpatch
- https://git.kernel.org/stable/c/fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfcpatch
- https://git.kernel.org/stable/c/f056fc2b927448d37eca6b6cacc3d1b0f67b20d2patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.