CVE-2026-68198 (GCVE-0-2026-68198)
Vulnerability from cvelistv5
Published
2026-08-10 12:00
Modified
2026-08-23 12:46
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: bdcd81707973cf8aa9305337166f8ee842a050d4 Version: bdcd81707973cf8aa9305337166f8ee842a050d4 Version: bdcd81707973cf8aa9305337166f8ee842a050d4 Version: bdcd81707973cf8aa9305337166f8ee842a050d4 Version: bdcd81707973cf8aa9305337166f8ee842a050d4 Version: bdcd81707973cf8aa9305337166f8ee842a050d4 Version: bdcd81707973cf8aa9305337166f8ee842a050d4 Version: bdcd81707973cf8aa9305337166f8ee842a050d4 |
||
{
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"product": "Linux",
"programFiles": [
"drivers/net/wireless/ath/ath6kl/txrx.c"
],
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"version": "0",
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"status": "unaffected",
"version": "5.15.217",
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{
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"version": "6.1.184",
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{
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"version": "7.1.6",
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"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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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": "2026-08-23T12:46:06.548Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/a1bac650b2d6b1baab1f3e78e2e007a6e2948dde"
},
{
"url": "https://git.kernel.org/stable/c/2132a6db05846dd2318857d00e0c1291f9e41b29"
},
{
"url": "https://git.kernel.org/stable/c/17ff29cd8dbc977c97788a5f7c011ec807b58242"
},
{
"url": "https://git.kernel.org/stable/c/64af6534a085f49d6ed33338a19ab9cf0d0523c9"
},
{
"url": "https://git.kernel.org/stable/c/b5d618fd61b9069b4c0a6b487022dd3117ad5acc"
},
{
"url": "https://git.kernel.org/stable/c/18965470d41e69d3fc10eb62afae29d10f4cdfd1"
},
{
"url": "https://git.kernel.org/stable/c/a3313111b5d9046af60b370c93eec105b27380c1"
},
{
"url": "https://git.kernel.org/stable/c/ba7debb4dd6427386862220e8335a53a4bfc235d"
}
],
"title": "wifi: ath6kl: fix use-after-free in aggr_reset_state()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"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": "2026-08-23T12:46:06.548Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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