Vulnerability-Lookup

GHSA-MRQ7-MRHJ-VM2G

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-14 00:31

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68198"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:07Z",
    "severity": "HIGH"
  },
  "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-\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.",
  "id": "GHSA-mrq7-mrhj-vm2g",
  "modified": "2026-08-14T00:31:53Z",
  "published": "2026-08-10T15:33:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68198"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18965470d41e69d3fc10eb62afae29d10f4cdfd1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64af6534a085f49d6ed33338a19ab9cf0d0523c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3313111b5d9046af60b370c93eec105b27380c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5d618fd61b9069b4c0a6b487022dd3117ad5acc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba7debb4dd6427386862220e8335a53a4bfc235d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-08-10 12:00 – Updated: 2026-08-17 05:00

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

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/64af6534a085f49d6…
https://git.kernel.org/stable/c/b5d618fd61b9069b4…
https://git.kernel.org/stable/c/18965470d41e69d3f…
https://git.kernel.org/stable/c/a3313111b5d9046af…
https://git.kernel.org/stable/c/ba7debb4dd6427386…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: bdcd81707973cf8aa9305337166f8ee842a050d4 , < 64af6534a085f49d6ed33338a19ab9cf0d0523c9 (git) Affected: bdcd81707973cf8aa9305337166f8ee842a050d4 , < b5d618fd61b9069b4c0a6b487022dd3117ad5acc (git) Affected: bdcd81707973cf8aa9305337166f8ee842a050d4 , < 18965470d41e69d3fc10eb62afae29d10f4cdfd1 (git) Affected: bdcd81707973cf8aa9305337166f8ee842a050d4 , < a3313111b5d9046af60b370c93eec105b27380c1 (git) Affected: bdcd81707973cf8aa9305337166f8ee842a050d4 , < ba7debb4dd6427386862220e8335a53a4bfc235d (git)
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath6kl/txrx.c"
          ],
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "b5d618fd61b9069b4c0a6b487022dd3117ad5acc",
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              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
              "versionType": "git"
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              "versionType": "git"
            },
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              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
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              "versionType": "git"
            }
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "version": "6.12.103",
              "versionType": "semver"
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              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "3.2",
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                },
                {
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                {
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                  "versionEndExcluding": "7.1.6",
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.2",
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              ],
              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:00:41.461Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/64af6534a085f49d6ed33338a19ab9cf0d0523c9"
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        },
        {
          "url": "https://git.kernel.org/stable/c/ba7debb4dd6427386862220e8335a53a4bfc235d"
        }
      ],
      "title": "wifi: ath6kl: fix use-after-free in aggr_reset_state()",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-MRQ7-MRHJ-VM2G

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

Tags

Sightings

Nomenclature