CVE-2026-90366 (GCVE-0-2026-90366)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-09-17 16:09
VLAI
Title
wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV When a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two bss_bcn_cntdwn_tlv entries (the CSA countdown and the CCA-abort BCC), but MT7996_BEACON_UPDATE_SIZE only reserved one. With MBSSID enabled and a near-maximum beacon template the extra 8 bytes could push the offload command past MT7996_MAX_BSS_OFFLOAD_SIZE and trigger skb_over_panic(). Reserve room for both countdown TLVs.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 98686cd21624c75a043e96812beadddf4f6f48e5 , < 1d348f96623ec20d700af7d4dfc00a74da6238ac (git)
Affected: 98686cd21624c75a043e96812beadddf4f6f48e5 , < bc1d694a1ffe0062c3adf0db1d64ad54454398ec (git)
Affected: 98686cd21624c75a043e96812beadddf4f6f48e5 , < 45d8896e4cffffb2c6554ccbec6efe7a0d53166f (git)
Affected: 98686cd21624c75a043e96812beadddf4f6f48e5 , < 1a51aff0e048dc5b8252d65808b79939c942d6ec (git)
Affected: 98686cd21624c75a043e96812beadddf4f6f48e5 , < 50c66bab321140c49aa2ed779a3ec9d2f085b458 (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7996/mcu.h"
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            "drivers/net/wireless/mediatek/mt76/mt7996/mcu.h"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
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              "versionType": "semver"
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              "status": "unaffected",
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV\n\nWhen a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two\nbss_bcn_cntdwn_tlv entries (the CSA countdown and the CCA-abort BCC), but\nMT7996_BEACON_UPDATE_SIZE only reserved one. With MBSSID enabled and a\nnear-maximum beacon template the extra 8 bytes could push the offload\ncommand past MT7996_MAX_BSS_OFFLOAD_SIZE and trigger skb_over_panic().\nReserve room for both countdown TLVs."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:09:08.785Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/50c66bab321140c49aa2ed779a3ec9d2f085b458"
        }
      ],
      "title": "wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
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    "datePublished": "2026-09-17T16:09:08.785Z",
    "dateReserved": "2026-09-11T19:38:34.807Z",
    "dateUpdated": "2026-09-17T16:09:08.785Z",
    "state": "PUBLISHED"
  },
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      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90366.json",
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                ],
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV\n\nWhen a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two\nbss_bcn_cntdwn_tlv entries (the CSA countdown and the CCA-abort BCC), but\nMT7996_BEACON_UPDATE_SIZE only reserved one. With MBSSID enabled and a\nnear-maximum beacon template the extra 8 bytes could push the offload\ncommand past MT7996_MAX_BSS_OFFLOAD_SIZE and trigger skb_over_panic().\nReserve room for both countdown TLVs."
          }
        ],
        "id": "CVE-2026-90366",
        "lastModified": "2026-09-17T17:17:35.700",
        "metrics": {},
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        "vulnStatus": "Received"
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      "current_release_date": "2026-09-21T23:44:03Z",
      "cve": "CVE-2026-90366",
      "id": "CVE-2026-90366",
      "initial_release_date": "2026-09-18T00:17:23Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "317",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90366",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90366.json",
      "version": "4"
    }
  }
}



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