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wifi: mac80211: shut down RX BA session timer on teardown

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: shut down RX BA session timer on teardown Tearing down an RX BA session can leave the session timer queued on a freed tid_rx. Later timer-wheel processing and the timer callback itself then run against freed memory. An RX BAR handler can dereference tid_rx under RCU before teardown unpublishes it and stay in its read-side critical section while teardown deletes the session timer. The stale handler can then rearm the timer after timer_delete_sync() returns and before the RCU callback frees tid_rx. Use timer_shutdown_sync() so rearm attempts become ineffective once teardown starts. Keep reorder_timer unchanged: teardown marks the session removed under reorder_lock and its release path checks that state before rearming. session_timer has no equivalent guard because ieee80211_rx_h_ctrl() rearms it before taking reorder_lock.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.15.224, 6.1.191, 6.12.113, 6.18.56, 6.6.160, 7.2.10
CVEs
CVE-2026-98707
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 02:47 UTC · Revision 1

Source evidence

wifi: mac80211: shut down RX BA session timer on teardown

core-osv · Original source

Published 18 Oct 2026, 15:46 UTC

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: shut down RX BA session timer on teardown Tearing down an RX BA session can leave the session timer queued on a freed tid_rx. Later timer-wheel processing and the timer callback itself then run against freed memory. An RX BAR handler can dereference tid_rx under RCU before teardown unpublishes it and stay in its read-side critical section while teardown deletes the session timer. The stale handler can then rearm the timer after timer_delete_sync() returns and before the RCU callback frees tid_rx. Use timer_shutdown_sync() so rearm attempts become ineffective once teardown starts. Keep reorder_timer unchanged: teardown marks the session removed under reorder_lock and its release path checks that state before rearming. session_timer has no equivalent guard because ieee80211_rx_h_ctrl() rearms it before taking reorder_lock.

osv:CVE-2026-98707

Kernel

Fixed versions: 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10

Complete source record
{
  "id": "af1ae6e09fe5d06941b7186fc9eacc357934dbd03806c5d44626f70f6fec808a",
  "url": "https://osv.dev/vulnerability/CVE-2026-98707",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mac80211: shut down RX BA session timer on teardown",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: shut down RX BA session timer on teardown Tearing down an RX BA session can leave the session timer queued on a freed tid_rx. Later timer-wheel processing and the timer callback itself then run against freed memory. An RX BAR handler can dereference tid_rx under RCU before teardown unpublishes it and stay in its read-side critical section while teardown deletes the session timer. The stale handler can then rearm the timer after timer_delete_sync() returns and before the RCU callback frees tid_rx. Use timer_shutdown_sync() so rearm attempts become ineffective once teardown starts. Keep reorder_timer unchanged: teardown marks the session removed under reorder_lock and its release path checks that state before rearming. session_timer has no equivalent guard because ieee80211_rx_h_ctrl() rearms it before taking reorder_lock.",
    "evidence": "osv:CVE-2026-98707",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
          },
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            "evidence": "/affected/1/ranges"
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            "value": "7.2.10",
            "evidence": "/affected/1/ranges"
          }
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        "affected_versions": []
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    "severity": "unknown",
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      "aliases": [
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      "affected": [
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            {
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                  "introduced": "6.13.0"
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          ],
          "package": {
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          "database_specific": {
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      ],
      "modified": "2026-11-01T02:30:30.669725060Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/09b7d5e4f88504e62ddf4ff31ebeebb3b87578ba",
        "https://git.kernel.org/stable/c/18cf74311f3f0bc77384549d270c489f64c6510a",
        "https://git.kernel.org/stable/c/225c67a0bea0bd42f568f4842e747bb7f4bafebb",
        "https://git.kernel.org/stable/c/481f9230284c27052b59c587069f232c5d84779e",
        "https://git.kernel.org/stable/c/7bb2a5bd4f07192fca35644fab7d49a17bfbc861",
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        "https://git.kernel.org/stable/c/e588e83e5c7a0f6d7a77dbbb58927c8c8cfd598e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98707.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98707",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98707.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98707",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 514410,
  "published_at": "2026-10-18T15:46:37.587+00:00"
}