FKIE_CVE-2026-98709

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-30 13:21
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03525b632908b049f4d04cc8a71cdff2329589cf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/183cc72ae9467717afba8b8d194a558a6666cb53
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/437f3727b4fd715266c296435c116288f82666fd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4ae6ed5b6074df5f3da05fd74c40bb24c5c9b41d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c4671a706d2d85442a30850abfada5377ffbbc8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5cc54a000960bc88f8c58940164dca0e601ab39c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b3d9f582f98e06070d5233b177b2899b693a01ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d31f655e44631891788ca67018ec5e1ed1c7de86
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/chan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4c4671a706d2d85442a30850abfada5377ffbbc8",
              "status": "affected",
              "version": "5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f",
              "versionType": "git"
            },
            {
              "lessThan": "183cc72ae9467717afba8b8d194a558a6666cb53",
              "status": "affected",
              "version": "5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f",
              "versionType": "git"
            },
            {
              "lessThan": "b3d9f582f98e06070d5233b177b2899b693a01ec",
              "status": "affected",
              "version": "5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f",
              "versionType": "git"
            },
            {
              "lessThan": "4ae6ed5b6074df5f3da05fd74c40bb24c5c9b41d",
              "status": "affected",
              "version": "5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f",
              "versionType": "git"
            },
            {
              "lessThan": "d31f655e44631891788ca67018ec5e1ed1c7de86",
              "status": "affected",
              "version": "5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f",
              "versionType": "git"
            },
            {
              "lessThan": "03525b632908b049f4d04cc8a71cdff2329589cf",
              "status": "affected",
              "version": "5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f",
              "versionType": "git"
            },
            {
              "lessThan": "5cc54a000960bc88f8c58940164dca0e601ab39c",
              "status": "affected",
              "version": "5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f",
              "versionType": "git"
            },
            {
              "lessThan": "437f3727b4fd715266c296435c116288f82666fd",
              "status": "affected",
              "version": "5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/chan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.17"
            },
            {
              "lessThan": "3.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-98709",
  "lastModified": "2026-10-30T13:21:20.337",
  "metrics": {},
  "published": "2026-10-18T16:17:24.437",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/03525b632908b049f4d04cc8a71cdff2329589cf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/183cc72ae9467717afba8b8d194a558a6666cb53"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/437f3727b4fd715266c296435c116288f82666fd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4ae6ed5b6074df5f3da05fd74c40bb24c5c9b41d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4c4671a706d2d85442a30850abfada5377ffbbc8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5cc54a000960bc88f8c58940164dca0e601ab39c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b3d9f582f98e06070d5233b177b2899b693a01ec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d31f655e44631891788ca67018ec5e1ed1c7de86"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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