CVE-2026-90399 (GCVE-0-2026-90399)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-21 12:51
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix stride mismatch in mac_phy_caps_parse() Currently, in ath12k_wmi_mac_phy_caps_parse(), kzalloc() sizes the mac_phy_caps buffer as tot_phy_id * len, where len is clamped to min(firmware_len, sizeof(struct ath12k_wmi_mac_phy_caps_params)). The subsequent memcpy() destination advances by sizeof(full struct) per slot via C pointer arithmetic, not by the clamped len. When firmware sends short TLVs, the second and later slots are written past the end of the allocation. The reader in ath12k_pull_mac_phy_cap_svc_ready_ext() also indexes the buffer with full-struct pointer arithmetic, so the allocation must match that stride. Fix by using kzalloc_objs(), which derives the element size from the pointer type, making allocation size and pointer stride provably consistent regardless of what len the firmware provides. Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
References
Impacted products
Vendor Product Version
Linux Linux Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
Version: d889913205cf7ebda905b1e62c5867ed4e39f6c2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath12k/wmi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "79c6f4f7d16eea1bcb8bc5c8fd6ec04a01b0614f",
              "status": "affected",
              "version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2",
              "versionType": "git"
            },
            {
              "lessThan": "d3355e0fdbbf531ca8b82a6a3feb80a1b7306a8b",
              "status": "affected",
              "version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2",
              "versionType": "git"
            },
            {
              "lessThan": "b9a5d12cbdeb860306f8d47c92caee0ea6ee0e0a",
              "status": "affected",
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              "versionType": "git"
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            {
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath12k/wmi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix stride mismatch in mac_phy_caps_parse()\n\nCurrently, in ath12k_wmi_mac_phy_caps_parse(), kzalloc() sizes the\nmac_phy_caps buffer as tot_phy_id * len, where len is clamped to\nmin(firmware_len, sizeof(struct ath12k_wmi_mac_phy_caps_params)). The\nsubsequent memcpy() destination advances by sizeof(full struct) per slot\nvia C pointer arithmetic, not by the clamped len. When firmware sends\nshort TLVs, the second and later slots are written past the end of the\nallocation.\n\nThe reader in ath12k_pull_mac_phy_cap_svc_ready_ext() also indexes the\nbuffer with full-struct pointer arithmetic, so the allocation must match\nthat stride.\n\nFix by using kzalloc_objs(), which derives the element size from the\npointer type, making allocation size and pointer stride provably\nconsistent regardless of what len the firmware provides.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The malformed bytes are WMI_TAG_MAC_PHY_CAPABILITIES TLVs inside WMI_SERVICE_READY_EXT_EVENTID, DMA\u0027d from the ath12k firmware Copy Engine (ath12k_ce_recv_process_cb \u2192 ath12k_htc_rx_completion_handler \u2192 ath12k_wmi_op_rx \u2192 ath12k_service_ready_ext_event \u2192 ath12k_wmi_mac_phy_caps_parse). That is PCIe/AHB host-firmware WMI, not an 802.11 frame.\nAC:L - Firmware sets tot_phy_id via fls(phy_id_map) in ath12k_wmi_hw_mode_caps_parse and the TLV length (no min_len for WMI_TAG_MAC_PHY_CAPABILITIES). Any tot_phy_id\u003e=2 with len \u003c sizeof(struct ath12k_wmi_mac_phy_caps_params) makes memcpy of slot 1+ land past the tot_phy_id*len kzalloc; no race or layout lottery.\nPR:N - The CE/HTC WMI receive path has no capable() or authentication check; ath12k_service_ready_ext_event parses whatever firmware posts. A compromised or malicious WCN7850/QCN9274 firmware needs no Linux account.\nUI:N - ath12k_core_start() blocks in ath12k_wmi_wait_for_service_ready() during probe and crash recovery (ath12k_core_reconfigure_on_crash); the overflow runs when that event arrives, with no victim ioctl, mount, or iface config.\nS:U - The GFP_ATOMIC heap overflow is in the host kernel\u0027s mac_phy_caps buffer allocated by ath12k_wmi_mac_phy_caps_parse. Impact stays in that kernel; this is not a KVM/Xen escape or IOMMU DMA-remapping bypass.\nC:H - memcpy writes firmware-chosen payloads at full-struct strides past a short tot_phy_id*len object, and ath12k_wmi_save_all_mac_phy_info()/ath12k_pull_mac_phy_cap_svc_ready_ext() then read that heap with the same stride, giving a high-confidentiality primitive from adjacent objects.\nI:H - Each overflowing slot is an out-of-bounds write of firmware-controlled contents (up to just-under-sizeof(struct ath12k_wmi_mac_phy_caps_params) bytes) into the kernel heap, enabling adjacent-object corruption and control-flow hijack.\nA:H - The same OOB write, and the later full-struct walk of the undersized mac_phy_caps buffer in ath12k_wmi_save_all_mac_phy_info(), can smash heap metadata or adjacent pointers and oops/panic the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:51:30.270Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/79c6f4f7d16eea1bcb8bc5c8fd6ec04a01b0614f"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3355e0fdbbf531ca8b82a6a3feb80a1b7306a8b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b9a5d12cbdeb860306f8d47c92caee0ea6ee0e0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/26f8f87f0a556e7984366c64cebc16d49e15d22f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c6eb712a91fa079be6f9f1419c96e0ad2227081"
        }
      ],
      "title": "wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90399",
    "datePublished": "2026-09-17T16:09:30.273Z",
    "dateReserved": "2026-09-11T19:38:34.811Z",
    "dateUpdated": "2026-10-21T12:51:30.270Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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