CVE-2026-80635 (GCVE-0-2026-80635)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-29 06:21
VLAI
Title
wifi: wcn36xx: fix OOB read from short trigger BA firmware response
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: wcn36xx: fix OOB read from short trigger BA firmware response The firmware response length is only checked against sizeof(*rsp) (20 bytes), but when candidate_cnt >= 1, a 22-byte candidate struct is read at buf + 20 without verifying the response contains it. This causes an out-of-bounds read of stale heap data, corrupting the BA session state. Add validation that the response includes the candidate data.
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 CPE status
Linux Linux Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < 04aba50212f9f274e1a726fb3873b5ce8da2d821 (git)
Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < c07aa0534d50361183833e3803204044cf1d0476 (git)
Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < d0b57bcd0dac6e2c9a3e474ec280e7db0b3edf35 (git)
Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < af8f0ea1f0a3a5fb5ed2b8fed3f1501d644597ee (git)
Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < d0cafe6ed8d1f6d0097eda31d85f5760d4f359c2 (git)
Affected: 16be1ac55944412e8d132b1db26f994b368c5742 , < b5e6f21923ca89d90256e7346301056f6502691e (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/wcn36xx/smd.c"
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              "version": "6.18.40",
              "versionType": "semver"
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              "version": "7.1.5",
              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wcn36xx: fix OOB read from short trigger BA firmware response\n\nThe firmware response length is only checked against sizeof(*rsp) (20\nbytes), but when candidate_cnt \u003e= 1, a 22-byte candidate struct is read\nat buf + 20 without verifying the response contains it. This causes an\nout-of-bounds read of stale heap data, corrupting the BA session state.\n\nAdd validation that the response includes the candidate data."
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
          },
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              "value": "AV:A - The bug is in parsing a WLAN firmware HAL response during TX block-ack setup; that path is reached only when an adjacent 802.11 peer drives AMPDU/BA negotiation over WiFi, not via remote IP or local syscalls.\nAC:L - An adjacent attacker can repeatedly send QoS data to a victim using wcn36xx to force ieee80211_start_tx_ba_session and wcn36xx_smd_trigger_ba, retrying until firmware returns a short TRIGGER_BA_RSP with candidate_cnt\u003e=1.\nPR:N - Exploitation requires only wireless adjacency as an associated AP or client peer; no Linux account, capabilities, or user-namespace privileges on the victim host are needed.\nUI:N - The victim needs no deliberate action beyond normal WiFi use; the attacker triggers BA setup by sending traffic that causes automatic AMPDU aggregation on the victim interface.\nS:U - Impact is confined to the kernel WiFi driver and its firmware session state on the same host; it does not cross VM, container, or IOMMU security boundaries.\nC:H - When candidate_cnt\u003e=1 but the response is only 20 bytes, the driver OOB-reads a 22-byte candidate from stale hal_buf data beyond the message, disclosing adjacent kernel buffer contents that may include prior HAL keying material.\nI:H - Stale OOB data is copied into ba_info and used as the block-ack starting sequence number for wcn36xx_smd_add_ba_session, corrupting BA session state and subsequent driver/firmware behavior.\nA:H - Corrupted block-ack parameters and malformed firmware/driver state can destabilize the WLAN subsystem, causing connection loss, firmware/driver errors, or kernel crashes under repeated attack."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:21:35.535Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80635",
    "datePublished": "2026-08-28T06:48:49.637Z",
    "dateReserved": "2026-08-26T14:34:25.777Z",
    "dateUpdated": "2026-08-29T06:21:35.535Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-01",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T12:15:43+00:00",
      "cve": "CVE-2026-80635",
      "id": "CVE-2026-80635",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: wcn36xx: fix OOB read from short trigger BA firmware response",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80635.json",
      "version": "3"
    }
  }
}



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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

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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.