Vulnerability-Lookup

FKIE_CVE-2026-93793

Vulnerability from fkie_nvd - Published: 2026-09-24 17:17 - Updated: 2026-09-25 13:17

Severity

8.8 (High) - CVSS:3.1/AV:A/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: iwlwifi: mvm: validate TX_CMD response layout TX_CMD parsing uses frame_count to walk status entries and then read the trailing SCD SSN. Make the minimum-length check follow that exact runtime layout calculation before parsing the payload. For new TX API, reject TX_CMD responses with frame_count != 1 and warn/return in the aggregation handler to document that aggregated accounting is expected via BA notifications.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4d942dfc13aec393e003ab28ff58db744c26e6eb
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8d70881707b47353359df57df12f6de67fdacdd2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b",
              "status": "affected",
              "version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c",
              "versionType": "git"
            },
            {
              "lessThan": "4d942dfc13aec393e003ab28ff58db744c26e6eb",
              "status": "affected",
              "version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c",
              "versionType": "git"
            },
            {
              "lessThan": "8d70881707b47353359df57df12f6de67fdacdd2",
              "status": "affected",
              "version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.9"
            },
            {
              "lessThan": "3.9",
              "status": "unaffected",
              "version": "0",
              "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: validate TX_CMD response layout\n\nTX_CMD parsing uses frame_count to walk status entries and then\nread the trailing SCD SSN. Make the minimum-length check follow\nthat exact runtime layout calculation before parsing the payload.\n\nFor new TX API, reject TX_CMD responses with frame_count != 1 and\nwarn/return in the aggregation handler to document that aggregated\naccounting is expected via BA notifications."
    }
  ],
  "id": "CVE-2026-93793",
  "lastModified": "2026-09-25T13:17:19.883",
  "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"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-24T17:17:12.050",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4d942dfc13aec393e003ab28ff58db744c26e6eb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8d70881707b47353359df57df12f6de67fdacdd2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-93793 (GCVE-0-2026-93793)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:02 – Updated: 2026-09-25 12:42

Title

wifi: iwlwifi: mvm: validate TX_CMD response layout

Summary

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/fc14f5fe8a4374ed1…
https://git.kernel.org/stable/c/4d942dfc13aec393e…
https://git.kernel.org/stable/c/8d70881707b473533…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c , < fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b (git) Affected: 8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c , < 4d942dfc13aec393e003ab28ff58db744c26e6eb (git) Affected: 8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c , < 8d70881707b47353359df57df12f6de67fdacdd2 (git)
Linux	Linux	Affected: 3.9 Unaffected: 0 , < 3.9 (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b",
              "status": "affected",
              "version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c",
              "versionType": "git"
            },
            {
              "lessThan": "4d942dfc13aec393e003ab28ff58db744c26e6eb",
              "status": "affected",
              "version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c",
              "versionType": "git"
            },
            {
              "lessThan": "8d70881707b47353359df57df12f6de67fdacdd2",
              "status": "affected",
              "version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.9"
            },
            {
              "lessThan": "3.9",
              "status": "unaffected",
              "version": "0",
              "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": "6.12.111",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: validate TX_CMD response layout\n\nTX_CMD parsing uses frame_count to walk status entries and then\nread the trailing SCD SSN. Make the minimum-length check follow\nthat exact runtime layout calculation before parsing the payload.\n\nFor new TX API, reject TX_CMD responses with frame_count != 1 and\nwarn/return in the aggregation handler to document that aggregated\naccounting is expected via BA notifications."
        }
      ],
      "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 malformed input is a firmware TX_CMD (REPLY_TX 0x1c) notification DMA\u0027d from the Intel WiFi NIC: iwl_pcie_rx_handle() \u2192 iwl_op_mode_rx() \u2192 iwl_mvm_rx()/iwl_mvm_rx_mq() \u2192 iwl_mvm_rx_common() \u2192 RX_HANDLER(TX_CMD, iwl_mvm_rx_tx_cmd). Those bytes are not a routable IP payload; WiFi host-device range is Adjacent.\nAC:L - iwl_mvm_rx_tx_cmd() is RX_HANDLER_SYNC; a single TX_CMD whose firmware-chosen frame_count makes iwl_mvm_tx_resp_min_len() exceed iwl_rx_packet_payload_len() (or frame_count!=1 on the new TX API) is parsed immediately, with no race or victim state the sender cannot induce by posting that notification.\nPR:N - iwl_mvm_rx_common() only checks pkt_len against sizeof(struct iwl_tx_resp) then calls iwl_mvm_rx_tx_cmd() with no uid, capability, or 802.11 authentication check; TX_CMD is in no_reclaim_cmds as a ucode-originated notif. An RF-adjacent attacker needs no host account.\nUI:N - The NAPI path consumes TX_CMD automatically when firmware posts a TX completion while the interface is up; iwl_mvm_rx_tx_cmd() does not require the victim to mount, open a file, or take any extra action at trigger time.\nS:U - iwl_mvm_get_scd_ssn() and iwl_trans_reclaim() from iwl_mvm_rx_tx_cmd_single() operate on host iwlwifi RX pages and TX queues inside the same kernel authority; this is not a KVM/Xen escape or an IOMMU/DMA-boundary bypass.\nC:H - iwl_mvm_get_scd_ssn() does le32_to_cpup((__le32 *)agg_status + frame_count) with no payload check, and iwl_mvm_rx_tx_cmd_agg_dbg() walks status[frame_count] (u8, up to 255 entries). That is an out-of-bounds read past the TX_CMD into the RX page, and a poisoned SSN into iwl_trans_reclaim() is UAF-class.\nI:H - The over-read SCD SSN is passed to iwl_trans_reclaim()/iwl_pcie_reclaim(), which unmaps TFDs, NULLs txq-\u003eentries[].skb, and advances txq-\u003eread_ptr, completing in-flight TX buffers early. That is an out-of-bounds-fed free/write of live TX objects, not a bounded status update.\nA:H - iwl_pcie_reclaim() WARNs on a missing skb or cmd-queue txq_id, and an SSN whose last_to_free is not in iwl_txq_used() desynchronizes the TX ring; walking status[frame_count] past the mapped RX buffer can oops. Kernel WARN/oops or a firmware-assert restart is high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T12:42:59.445Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d942dfc13aec393e003ab28ff58db744c26e6eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d70881707b47353359df57df12f6de67fdacdd2"
        }
      ],
      "title": "wifi: iwlwifi: mvm: validate TX_CMD response layout",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93793",
    "datePublished": "2026-09-24T16:02:26.708Z",
    "dateReserved": "2026-09-18T17:59:28.789Z",
    "dateUpdated": "2026-09-25T12:42:59.445Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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FKIE_CVE-2026-93793

CVE-2026-93793 (GCVE-0-2026-93793)

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