GHSA-G34C-VJM7-4VQ5

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-30 15:33
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: count only matching reservations in reserved switch

ieee80211_vif_use_reserved_switch() validates a replacement by counting assigned links on ctx->replace_ctx and treating reservations too broadly. A link can still be assigned to the old channel context while holding a reservation that belongs to a different replacement operation.

That can make the current replacement appear complete too early. If another link finalizes first, the function can free the WILL_BE_REPLACED chanctx while the unmatched link and driver still use it, leading to a use-after-free in later beacon generation.

Require an in-place reservation to point at the current replacement context, and require the reserved and assigned contexts to be the matching replacement pair, before counting or moving the link.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98709"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:24Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: count only matching reservations in reserved switch\n\nieee80211_vif_use_reserved_switch() validates a replacement by counting\nassigned links on ctx-\u003ereplace_ctx and treating reservations too\nbroadly. A link can still be assigned to the old channel context while\nholding a reservation that belongs to a different replacement\noperation.\n\nThat can make the current replacement appear complete too early. If\nanother link finalizes first, the function can free the\nWILL_BE_REPLACED chanctx while the unmatched link and driver still use\nit, leading to a use-after-free in later beacon generation.\n\nRequire an in-place reservation to point at the current replacement\ncontext, and require the reserved and assigned contexts to be the\nmatching replacement pair, before counting or moving the link.",
  "id": "GHSA-g34c-vjm7-4vq5",
  "modified": "2026-10-30T15:33:58Z",
  "published": "2026-10-18T18:32:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98709"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03525b632908b049f4d04cc8a71cdff2329589cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/183cc72ae9467717afba8b8d194a558a6666cb53"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/437f3727b4fd715266c296435c116288f82666fd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ae6ed5b6074df5f3da05fd74c40bb24c5c9b41d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c4671a706d2d85442a30850abfada5377ffbbc8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5cc54a000960bc88f8c58940164dca0e601ab39c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3d9f582f98e06070d5233b177b2899b693a01ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d31f655e44631891788ca67018ec5e1ed1c7de86"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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