CVE-2026-68198 (GCVE-0-2026-68198)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:00 – Updated: 2026-08-17 05:00
VLAI
Title
wifi: ath6kl: fix use-after-free in aggr_reset_state()
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: fix use-after-free in aggr_reset_state() The aggr_reset_state() function uses timer_delete() (non-synchronous) for the aggregation timer before proceeding to delete TID state and before the structure is freed by callers like aggr_module_destroy(). If the timer callback (aggr_timeout) is executing when aggr_reset_state() is called, the callback will continue to access aggr_conn fields like rx_tid[] and stat[] which may be freed immediately after by kfree(aggr_info->aggr_conn) in aggr_module_destroy(). Additionally, the timer callback can re-arm itself via mod_timer() while aggr_reset_state() is running, creating a more complex race condition. Use timer_delete_sync() instead to ensure any running timer callback has completed before returning.
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: bdcd81707973cf8aa9305337166f8ee842a050d4 , < 64af6534a085f49d6ed33338a19ab9cf0d0523c9 (git)
Affected: bdcd81707973cf8aa9305337166f8ee842a050d4 , < b5d618fd61b9069b4c0a6b487022dd3117ad5acc (git)
Affected: bdcd81707973cf8aa9305337166f8ee842a050d4 , < 18965470d41e69d3fc10eb62afae29d10f4cdfd1 (git)
Affected: bdcd81707973cf8aa9305337166f8ee842a050d4 , < a3313111b5d9046af60b370c93eec105b27380c1 (git)
Affected: bdcd81707973cf8aa9305337166f8ee842a050d4 , < ba7debb4dd6427386862220e8335a53a4bfc235d (git)
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Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath6kl/txrx.c"
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              "versionType": "semver"
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              "version": "7.1.6",
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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          "lang": "en",
          "value": "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-\u003eaggr_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."
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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              "lang": "en",
              "value": "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-\u003etimer, 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\u0027s 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-\u003etimer_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."
            }
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        {
          "url": "https://git.kernel.org/stable/c/ba7debb4dd6427386862220e8335a53a4bfc235d"
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    "cveId": "CVE-2026-68198",
    "datePublished": "2026-08-10T12:00:16.718Z",
    "dateReserved": "2026-07-30T09:28:09.374Z",
    "dateUpdated": "2026-08-17T05:00:41.461Z",
    "state": "PUBLISHED"
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      "date": "2026-08-20",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T13:43:49+00:00",
      "cve": "CVE-2026-68198",
      "id": "CVE-2026-68198",
      "initial_release_date": "2026-08-10T12:00:16.718000+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Use-after-free in ath6kl Wi-Fi driver leading to denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68198.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-13T01:28:13Z",
      "cve": "CVE-2026-68198",
      "id": "CVE-2026-68198",
      "initial_release_date": "2026-08-12T16:22:45Z",
      "product_status:known_affected": "292",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68198",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68198.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.