CVE-2026-98889 (GCVE-0-2026-98889)

Vulnerability from cvelistv5 – Published: 2026-10-23 11:37 – Updated: 2026-10-26 06:56
VLAI
Title
wifi: iwlwifi: mvm: fix sched scan IE sizing
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mvm: fix sched scan IE sizing Scheduled scan built the probe request before iwl_mvm_scan_fits(), so oversized IEs could be copied into the fixed preq buffer before length validation. Move iwl_mvm_build_scan_probe() after the fits check. Also advertise max_sched_scan_ie_len using iwl_mvm_max_scan_ie_len() so userspace limits account for driver-inserted DS/TPC bytes.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: eae94cf82d7456b57fa9fd55c1edb8a726dcc19c , < f2268060e99f94314b9988dfa17393c2694fa9b2 (git)
Affected: eae94cf82d7456b57fa9fd55c1edb8a726dcc19c , < 358eca9a898ad4cce7453e9dcfd005d019a2b01f (git)
Affected: eae94cf82d7456b57fa9fd55c1edb8a726dcc19c , < 05f79cea3b15cfe600b205ddcfd51ebee15d908a (git)
Affected: eae94cf82d7456b57fa9fd55c1edb8a726dcc19c , < a24417478f90e9f1a4ea24cd4b784afccb56fbae (git)
Affected: eae94cf82d7456b57fa9fd55c1edb8a726dcc19c , < 0a63f98e5163a2ec2822dfb691ee5a6094de08ec (git)
Affected: eae94cf82d7456b57fa9fd55c1edb8a726dcc19c , < 4f155d262b31b9b17e0f9856bdabe0968eb4930f (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c",
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: fix sched scan IE sizing\n\nScheduled scan built the probe request before iwl_mvm_scan_fits(),\nso oversized IEs could be copied into the fixed preq buffer before\nlength validation. Move iwl_mvm_build_scan_probe() after the fits\ncheck.\n\nAlso advertise max_sched_scan_ie_len using iwl_mvm_max_scan_ie_len()\nso userspace limits account for driver-inserted DS/TPC bytes."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Attacker-controlled bytes enter through NL80211_CMD_START_SCHED_SCAN\u0027s NL80211_ATTR_IE, then traverse ieee80211_request_sched_scan_start() to patched iwl_mvm_sched_scan_start() and iwl_mvm_build_scan_probe(); they are not received WiFi frames.\nAC:L - A valid IE stream near the advertised 486-byte limit deterministically overflows because ieee80211_build_preq_ies() adds and can duplicate data per band, while vulnerable iwl_mvm_sched_scan_start() calls iwl_mvm_build_scan_probe() before iwl_mvm_scan_fits(); no race is required.\nPR:L - NL80211_CMD_START_SCHED_SCAN uses GENL_UNS_ADMIN_PERM, which checks CAP_NET_ADMIN in the network namespace\u0027s owning user namespace; mac80211 sets WIPHY_FLAG_NETNS_OK, so a wiphy delegated to a user/net namespace is reachable without init-namespace root.\nUI:N - The attacker directly submits the scheduled-scan netlink request against an up, idle interface; no separate victim action is required.\nS:U - The overflow corrupts the host kernel stack inside iwl_mvm_sched_scan_start() and does not cross a VM, IOMMU, or other distinct security authority.\nC:H - The copies can run beyond params.preq.buf through adjacent pointers and beyond the local params object; this attacker-influenced stack corruption can be leveraged for control-flow execution and consequent disclosure of arbitrary kernel memory.\nI:H - iwl_mvm_build_scan_probe() copies attacker-supplied IEs plus per-band generated data into the fixed 512-byte preq.buf without first enforcing iwl_mvm_scan_fits(), producing an attacker-shaped out-of-bounds stack write capable of control-flow hijacking.\nA:H - The overwrite can extend beyond struct iwl_mvm_scan_params into stack control state; stack-protector detection or corrupted return state can oops or panic the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-26T06:56:14.362Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/f2268060e99f94314b9988dfa17393c2694fa9b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/358eca9a898ad4cce7453e9dcfd005d019a2b01f"
        },
        {
          "url": "https://git.kernel.org/stable/c/05f79cea3b15cfe600b205ddcfd51ebee15d908a"
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          "url": "https://git.kernel.org/stable/c/a24417478f90e9f1a4ea24cd4b784afccb56fbae"
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        },
        {
          "url": "https://git.kernel.org/stable/c/4f155d262b31b9b17e0f9856bdabe0968eb4930f"
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      "title": "wifi: iwlwifi: mvm: fix sched scan IE sizing",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98889",
    "datePublished": "2026-10-23T11:37:49.469Z",
    "dateReserved": "2026-09-25T10:25:14.378Z",
    "dateUpdated": "2026-10-26T06:56:14.362Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98889",
      "date": "2026-11-08",
      "epss": "0.00169",
      "percentile": "0.06344"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-98889",
      "id": "msrc_CVE-2026-98889",
      "initial_release_date": "2026-10-24T01:04:15.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "wifi: iwlwifi: mvm: fix sched scan IE sizing",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98889.json",
      "version": "4"
    },
    "nvd": {
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                "product": "Linux",
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                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: fix sched scan IE sizing\n\nScheduled scan built the probe request before iwl_mvm_scan_fits(),\nso oversized IEs could be copied into the fixed preq buffer before\nlength validation. Move iwl_mvm_build_scan_probe() after the fits\ncheck.\n\nAlso advertise max_sched_scan_ie_len using iwl_mvm_max_scan_ie_len()\nso userspace limits account for driver-inserted DS/TPC bytes."
          }
        ],
        "id": "CVE-2026-98889",
        "lastModified": "2026-10-26T07:17:14.010",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-10-23T12:18:22.717",
        "references": [
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T03:17:42+00:00",
      "cve": "CVE-2026-98889",
      "id": "CVE-2026-98889",
      "initial_release_date": "2026-10-23T00:00:00+00:00",
      "product_status:known_affected": "161",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: iwlwifi: mvm: fix sched scan IE sizing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98889.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-05T00:52:19Z",
      "cve": "CVE-2026-98889",
      "id": "CVE-2026-98889",
      "initial_release_date": "2026-10-27T18:00:38Z",
      "product_status:known_affected": "126",
      "product_status:known_not_affected": "200",
      "product_status:recommended": "65",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98889",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98889.json",
      "version": "4"
    }
  }
}



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