CVE-2026-64255 (GCVE-0-2026-64255)

Vulnerability from cvelistv5 – Published: 2026-07-24 15:31 – Updated: 2026-07-27 04:59
VLAI
Title
wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
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().
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b , < 1de92789ce31e46fa7e7d8e89c90b19cdb1c103b (git)
Affected: 9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b , < fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc (git)
Affected: 9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b , < f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mld/agg.c"
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        }
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    "datePublished": "2026-07-24T15:31:22.870Z",
    "dateReserved": "2026-07-19T15:36:31.773Z",
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      "product_status:under_investigation": "1",
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      "title": "wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers",
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    "suse_vex": {
      "aggregate_severity": "not set",
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      "cve": "CVE-2026-64255",
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      "status": "interim",
      "title": "SUSE CVE CVE-2026-64255",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64255.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.