Answer in brief
CVE-2026-64255 records a Unknown severity vulnerability in wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b <1de92789ce31e46fa7e7d8e89c90b19cdb1c103b || >=9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b <fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc || >=9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b <f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 | 1de92789ce31e46fa7e7d8e89c90b19cdb1c103b, fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc, f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Jul 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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().
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64255 records a Unknown severity vulnerability in wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b <1de92789ce31e46fa7e7d8e89c90b19cdb1c103b || >=9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b <fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc || >=9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b <f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 | 1de92789ce31e46fa7e7d8e89c90b19cdb1c103b, fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc, f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Jul 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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().
Quoted source text, attributed separately from HOL analysis.