{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68198",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68198"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "wifi: ath6kl: fix use-after-free in aggr_reset_state()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath6kl: fix use-after-free in aggr_reset_state()\n\nThe aggr_reset_state() function uses timer_delete() (non-synchronous)\nfor the aggregation timer before proceeding to delete TID state and\nbefore the structure is freed by callers like aggr_module_destroy().\n\nIf the timer callback (aggr_timeout) is executing when aggr_reset_state()\nis called, the callback will continue to access aggr_conn fields like\nrx_tid[] and stat[] which may be freed immediately after by\nkfree(aggr_info->aggr_conn) in aggr_module_destroy().\n\nAdditionally, the timer callback can re-arm itself via mod_timer() while\naggr_reset_state() is running, creating a more complex race condition.\n\nUse timer_delete_sync() instead to ensure any running timer callback\nhas completed before returning.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68198"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a1bac650b2d6b1baab1f3e78e2e007a6e2948dde"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2132a6db05846dd2318857d00e0c1291f9e41b29"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/17ff29cd8dbc977c97788a5f7c011ec807b58242"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64af6534a085f49d6ed33338a19ab9cf0d0523c9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b5d618fd61b9069b4c0a6b487022dd3117ad5acc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/18965470d41e69d3fc10eb62afae29d10f4cdfd1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a3313111b5d9046af60b370c93eec105b27380c1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ba7debb4dd6427386862220e8335a53a4bfc235d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - ath6kl is a WiFi driver; the race is driven by 802.11 frames from an adjacent attacker \u2014 a gapped A-MPDU sequence arms the reorder timer and a deauth/disassoc or connect/disconnect event drives aggr_reset_state() via ath6kl_disconnect_event()/ath6kl_connect_event()/ath6kl_sta_cleanup(). This requires radio proximity, not routable network access.\nAC:L - The attacker controls both sides of the race: transmitting out-of-order aggregated frames arms aggr_conn->timer, and a deauth/disassoc or reconnect immediately invokes aggr_reset_state(), which frees rx_tid[].hold_q and (via aggr_module_destroy) aggr_conn itself while aggr_timeout() may be running or re-arming via mod_timer(). The sequence can be repeated indefinitely until the window is hit.\nPR:N - No privileges or account on the target system are required; a rogue AP the client associates with, or an attacker injecting unprotected deauth/disassoc frames at a station with an active block-ack session, is sufficient. In AP mode, a station joining an open network can trigger the same path on disconnect.\nUI:N - The station already associated and receiving aggregated traffic is enough; deauth/disassoc handling and the resulting aggr_reset_state() run automatically in the driver with no action by the device owner.\nS:U - The use-after-free is on kernel heap memory owned by the ath6kl driver and stays within the kernel's own security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The freed aggr_info_conn and hold_q allocations can be reclaimed and refilled with attacker-influenced data (e.g. sk_buff payloads from injected frames), so the concurrent callback reading rx_tid[]/stat[]/hold_q[] yields a controllable read primitive that can leak kernel memory contents.\nI:H - aggr_timeout() writes through the freed object \u2014 setting timer_scheduled, rxtid->timer_mon, dequeuing skbs from hold_q[] and calling mod_timer() on a freed timer_list \u2014 giving arbitrary writes into reclaimed heap objects and list corruption that is a classic path to control-flow hijack.\nA:H - Even without successful heap grooming, the use-after-free and the double-free/dangling-skb access in aggr_deque_frms() reliably produce slab corruption and a kernel oops or panic, and the attacker can repeat the trigger at will."
    }
  }
}