CVE-2026-74554 (GCVE-0-2026-74554)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:28 – Updated: 2026-08-17 05:48
VLAI
Title
wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup() ath12k_mac_dp_peer_cleanup() clears the ML peer ID slot on the free_ml_peer_id_map bitmap by indexing it with dp_peer->peer_id. That is wrong: dp_peer->peer_id for an MLO peer always carries the ATH12K_PEER_ML_ID_VALID bit (BIT(13)), so clear_bit() is invoked with index >= 0x2000, which is far outside the bitmap of ATH12K_MAX_MLO_PEERS (256) bits and corrupts memory adjacent to ah->free_ml_peer_id_map. The intended bitmap entry also never gets cleared, so subsequent ath12k_peer_ml_alloc() calls eventually run out of IDs. The ID without the VALID bit is what ath12k_peer_ml_alloc() returned and is stored in ahsta->ml_peer_id. Use that instead. While there, also reset ahsta->ml_peer_id to ATH12K_MLO_PEER_ID_INVALID so the bitmap and ahsta->ml_peer_id stay in sync. Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ee16dcf573d5e3283fda601dd4bca6bc52251017 , < 234b5cb81e6fcc1e3b31b13deff66130be55f36e (git)
Affected: ee16dcf573d5e3283fda601dd4bca6bc52251017 , < 47abd2ca281531deee38a3b3770d885e270e9fc9 (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath12k/mac.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "234b5cb81e6fcc1e3b31b13deff66130be55f36e",
              "status": "affected",
              "version": "ee16dcf573d5e3283fda601dd4bca6bc52251017",
              "versionType": "git"
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            {
              "lessThan": "47abd2ca281531deee38a3b3770d885e270e9fc9",
              "status": "affected",
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              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "7.0"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()\n\nath12k_mac_dp_peer_cleanup() clears the ML peer ID slot on the\nfree_ml_peer_id_map bitmap by indexing it with dp_peer-\u003epeer_id. That is\nwrong: dp_peer-\u003epeer_id for an MLO peer always carries the\nATH12K_PEER_ML_ID_VALID bit (BIT(13)), so clear_bit() is invoked with\nindex \u003e= 0x2000, which is far outside the bitmap of ATH12K_MAX_MLO_PEERS\n(256) bits and corrupts memory adjacent to ah-\u003efree_ml_peer_id_map. The\nintended bitmap entry also never gets cleared, so subsequent\nath12k_peer_ml_alloc() calls eventually run out of IDs.\n\nThe ID without the VALID bit is what ath12k_peer_ml_alloc() returned and\nis stored in ahsta-\u003eml_peer_id. Use that instead.\n\nWhile there, also reset ahsta-\u003eml_peer_id to ATH12K_MLO_PEER_ID_INVALID so\nthe bitmap and ahsta-\u003eml_peer_id stay in sync.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The bug is in ath12k WiFi 7 MLO peer cleanup during firmware crash recovery; an adjacent attacker associates as an MLO client (or runs a malicious MLO AP) over 802.11, creating dp_peers whose peer_id includes BIT(13), then firmware recovery invokes ath12k_mac_dp_peer_cleanup().\nAC:L - Once an MLO peer exists, recovery deterministically calls clear_bit() with index \u003e=0x2000 on every cleanup; the attacker controls association and can repeatedly induce or wait for firmware crash/recovery (MHI RDDM) without depending on uncontrollable timing or layout.\nPR:N - Exploitation requires only wireless association and firmware recovery on a host running ath12k; the remote attacker needs no local account, shell access, or Linux capabilities on the victim system.\nUI:N - On an ath12k AP the vulnerable recovery path runs without any action by the device operator beyond normal AP operation; the attacker triggers the condition solely by wireless association and crash/recovery events.\nS:U - The out-of-bounds clear_bit corrupts kernel memory in ath12k_hw/dp_hw adjacent to free_ml_peer_id_map; impact stays within kernel/driver context and does not by itself cross VM, container, or IOMMU security boundaries.\nC:H - clear_bit() with peer_id\u003e=0x2000 writes outside the 256-bit free_ml_peer_id_map into the adjacent dp_peers[] RCU pointer table, corrupting kernel pointers that can be dereferenced later for arbitrary kernel memory read primitives.\nI:H - The out-of-bounds atomic bit-clear is a kernel memory write that corrupts dp_peers[] entries used on datapath RX/TX, enabling control of freed/corrupted objects and potential arbitrary code execution, not merely a benign crash.\nA:H - Corrupted dp_peers pointers during recovery can cause kernel oops/panic on subsequent datapath use, and the bitmap slot is never freed so ath12k_peer_ml_alloc() exhausts MLO peer IDs, denying further MLO associations (DoS)."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:48:37.563Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e"
        },
        {
          "url": "https://git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9"
        }
      ],
      "title": "wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74554",
    "datePublished": "2026-08-15T12:28:00.097Z",
    "dateReserved": "2026-08-15T05:44:03.916Z",
    "dateUpdated": "2026-08-17T05:48:37.563Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-10-02",
      "epss": "0.0034",
      "percentile": "0.25225"
    },
    "nvd": {
      "cve": {
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            "affectedData": [
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                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/wireless/ath/ath12k/mac.c"
                ],
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                "vendor": "Linux",
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                "vendor": "Linux",
                "versions": [
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                    "version": "7.0"
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                  }
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              }
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()\n\nath12k_mac_dp_peer_cleanup() clears the ML peer ID slot on the\nfree_ml_peer_id_map bitmap by indexing it with dp_peer-\u003epeer_id. That is\nwrong: dp_peer-\u003epeer_id for an MLO peer always carries the\nATH12K_PEER_ML_ID_VALID bit (BIT(13)), so clear_bit() is invoked with\nindex \u003e= 0x2000, which is far outside the bitmap of ATH12K_MAX_MLO_PEERS\n(256) bits and corrupts memory adjacent to ah-\u003efree_ml_peer_id_map. The\nintended bitmap entry also never gets cleared, so subsequent\nath12k_peer_ml_alloc() calls eventually run out of IDs.\n\nThe ID without the VALID bit is what ath12k_peer_ml_alloc() returned and\nis stored in ahsta-\u003eml_peer_id. Use that instead.\n\nWhile there, also reset ahsta-\u003eml_peer_id to ATH12K_MLO_PEER_ID_INVALID so\nthe bitmap and ahsta-\u003eml_peer_id stay in sync.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3"
          }
        ],
        "id": "CVE-2026-74554",
        "lastModified": "2026-08-17T06:19:53.470",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-08-15T13:18:00.830",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T08:28:15+00:00",
      "cve": "CVE-2026-74554",
      "id": "CVE-2026-74554",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74554.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-21T00:39:32Z",
      "cve": "CVE-2026-74554",
      "id": "CVE-2026-74554",
      "initial_release_date": "2026-08-15T23:50:23Z",
      "product_status:known_not_affected": "284",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74554",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74554.json",
      "version": "4"
    }
  }
}



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