{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80635",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80635"
  ],
  "published": "2026-08-28T06:50:33Z",
  "summary": "wifi: wcn36xx: fix OOB read from short trigger BA firmware response",
  "details": "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 >= 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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80635"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/04aba50212f9f274e1a726fb3873b5ce8da2d821"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c07aa0534d50361183833e3803204044cf1d0476"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d0b57bcd0dac6e2c9a3e474ec280e7db0b3edf35"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af8f0ea1f0a3a5fb5ed2b8fed3f1501d644597ee"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d0cafe6ed8d1f6d0097eda31d85f5760d4f359c2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b5e6f21923ca89d90256e7346301056f6502691e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-29T06:25:05Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "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>=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>=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."
    }
  }
}