CVE-2026-93796 (GCVE-0-2026-93796)
Vulnerability from cvelistv5
Published
2026-09-24 16:02
Modified
2026-10-30 12:36
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: pcie: null RX pointers after free When iwl_pcie_tx_init() fails after RX init, nic init unwinds via iwl_pcie_rx_free(). The freed RX members stayed non-NULL on the live transport object, so later teardown or retry could touch stale RX state. Set rx_pool, global_table, rxq, and alloc_page to NULL after free to make repeated cleanup and retry paths safe.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9cf671d60fdbeb8f875859c11148cf13c326ada2
Version: 9cf671d60fdbeb8f875859c11148cf13c326ada2
Version: 9cf671d60fdbeb8f875859c11148cf13c326ada2
Version: 9cf671d60fdbeb8f875859c11148cf13c326ada2
Version: 9cf671d60fdbeb8f875859c11148cf13c326ada2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/pcie/gen1_2/rx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "847103369489110a222482c7781e0fe62cdbd3d5",
              "status": "affected",
              "version": "9cf671d60fdbeb8f875859c11148cf13c326ada2",
              "versionType": "git"
            },
            {
              "lessThan": "c422d5d53f135ea987f745773953a91f9fe30c3f",
              "status": "affected",
              "version": "9cf671d60fdbeb8f875859c11148cf13c326ada2",
              "versionType": "git"
            },
            {
              "lessThan": "6ec5bf430cf7466cb412e47f2761594092781fac",
              "status": "affected",
              "version": "9cf671d60fdbeb8f875859c11148cf13c326ada2",
              "versionType": "git"
            },
            {
              "lessThan": "3456c5bcc987aeb182e50e30c9b02be8420e9953",
              "status": "affected",
              "version": "9cf671d60fdbeb8f875859c11148cf13c326ada2",
              "versionType": "git"
            },
            {
              "lessThan": "2c79d7a7b583050c9f58041465cb46fe3483ab5d",
              "status": "affected",
              "version": "9cf671d60fdbeb8f875859c11148cf13c326ada2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/pcie/gen1_2/rx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "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": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "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": "6.1.191",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: pcie: null RX pointers after free\n\nWhen iwl_pcie_tx_init() fails after RX init, nic init unwinds via\niwl_pcie_rx_free().\n\nThe freed RX members stayed non-NULL on the live transport object,\nso later teardown or retry could touch stale RX state.\nSet rx_pool, global_table, rxq, and alloc_page to NULL after free\nto make repeated cleanup and retry paths safe."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The dangling pointers are created in iwl_pcie_rx_free() when iwl_pcie_nic_init() unwinds a failed iwl_pcie_tx_init() after iwl_pcie_rx_init(). That runs from iwl_trans_pcie_start_fw() during iwl_mvm_start_get_nvm()/iwl_mvm_up() (PCI firmware callback or mac80211 drv_start), not from iwl_pcie_rx_handle() or any 802.11 frame parse.\nAC:H - iwl_pcie_nic_init() only calls iwl_pcie_rx_free() when iwl_pcie_tx_init() fails after a successful iwl_pcie_rx_init(). Reachable failures are ENOMEM in iwl_pcie_tx_alloc() or a non-power-of-two slots_num in iwl_queue_init(); the attacker cannot make RX allocation succeed and the subsequent TX allocation fail on demand.\nPR:L - iwl_op_mode_mvm_start() calls iwl_mvm_start_get_nvm() \u2192 iwl_run_init_mvm_ucode() \u2192 iwl_trans_start_fw() with no capable() check from iwl_req_fw_callback after PCI bind. A local unprivileged process on a host with iwlwifi is sufficient; init-namespace CAP_NET_ADMIN is not required to reach this unwind.\nUI:N - After iwl_pcie_rx_free() in the nic_init unwind, iwl_mvm_start_get_nvm() always calls iwl_mvm_stop_device() (and iwl_run_init_ucode() always calls iwl_trans_stop_device()), so iwl_pcie_rx_napi_sync() uses the stale rxq with no victim mount, file open, or association.\nS:U - The UAF and double-free of trans_pcie-\u003erxq, rx_pool, global_table, and alloc_page stay inside the host iwlwifi PCIe transport on the same kernel authority; this is not a KVM/Xen guest-to-host escape or an IOMMU/DMA bypass.\nC:H - iwl_pcie_rx_free() kfree()s rxq/rx_pool/global_table and __free_pages()s alloc_page without NULL, then iwl_pcie_rx_napi_sync() and _iwl_pcie_rx_init() dereference those freed objects; UAF of those slabs/pages enables arbitrary kernel read.\nI:H - _iwl_pcie_rx_init() writes the dangling rxq/rx_pool/global_table (list restock, netif_napi_add), and a later iwl_pcie_rx_free() from iwl_trans_pcie_free() double-frees the same kmalloc objects, giving a heap write/control-flow primitive.\nA:H - iwl_pcie_rx_napi_sync() walking a kfree\u0027d rxq, or a second iwl_pcie_rx_free() of the same pointers from iwl_trans_pcie_free(), is a kernel oops or panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:36:47.103Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/847103369489110a222482c7781e0fe62cdbd3d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c422d5d53f135ea987f745773953a91f9fe30c3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ec5bf430cf7466cb412e47f2761594092781fac"
        },
        {
          "url": "https://git.kernel.org/stable/c/3456c5bcc987aeb182e50e30c9b02be8420e9953"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c79d7a7b583050c9f58041465cb46fe3483ab5d"
        }
      ],
      "title": "wifi: iwlwifi: pcie: null RX pointers after free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93796",
    "datePublished": "2026-09-24T16:02:29.478Z",
    "dateReserved": "2026-09-18T17:59:28.789Z",
    "dateUpdated": "2026-10-30T12:36:47.103Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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