CVE-2026-93793

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93793", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-18T17:59:28.789Z", "datePublished": "2026-09-24T16:02:26.708Z", "dateUpdated": "2026-10-30T12:36:44.982Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:36:44.982Z"}, "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": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The malformed input is a firmware TX_CMD (REPLY_TX 0x1c) notification DMA'd 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->entries[].skb, and advances txq->read_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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/intel/iwlwifi/mvm/tx.c"], "versions": [{"version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c", "lessThan": "658b5c00d653cdd72babc86791f6f6711190c740", "status": "affected", "versionType": "git"}, {"version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c", "lessThan": "5e871c03506c529d5fe372d099c1ad1465c7bc38", "status": "affected", "versionType": "git"}, {"version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c", "lessThan": "fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b", "status": "affected", "versionType": "git"}, {"version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c", "lessThan": "4d942dfc13aec393e003ab28ff58db744c26e6eb", "status": "affected", "versionType": "git"}, {"version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c", "lessThan": "8d70881707b47353359df57df12f6de67fdacdd2", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/intel/iwlwifi/mvm/tx.c"], "versions": [{"version": "3.9", "status": "affected"}, {"version": "0", "lessThan": "3.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/658b5c00d653cdd72babc86791f6f6711190c740"}, {"url": "https://git.kernel.org/stable/c/5e871c03506c529d5fe372d099c1ad1465c7bc38"}, {"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"}}}}

{}

{"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": "658b5c00d653cdd72babc86791f6f6711190c740", "status": "affected", "version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c", "versionType": "git"}, {"lessThan": "5e871c03506c529d5fe372d099c1ad1465c7bc38", "status": "affected", "version": "8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c", "versionType": "git"}, {"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": "6.1.*", "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"}]}], "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": "2026-10-30T13:21:02.800", "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/5e871c03506c529d5fe372d099c1ad1465c7bc38"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/658b5c00d653cdd72babc86791f6f6711190c740"}, {"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"}

{"bugzilla": {"description": "kernel: wifi: iwlwifi: mvm: validate TX_CMD response layout", "id": "2540514", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2540514"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nwifi: iwlwifi: mvm: validate TX_CMD response layout\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.\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.", "A flaw was found in the Linux kernel's Intel Wi-Fi driver (iwlwifi). The driver does not properly validate the length and structure of transmission command (TX_CMD) responses received from device firmware before parsing the data. A compromised firmware or malicious wireless device can return a malformed response with an unexpected frame count, triggering an out-of-bounds memory read. This issue may lead to a kernel crash and a Denial of Service (DoS)."], "name": "CVE-2026-93793", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93793\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93793\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93793.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,4d942dfc13aec393e003ab28ff58db744c26e6eb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,8d70881707b47353359df57df12f6de67fdacdd2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.111)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.53)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-24T20:15:03.509257+00:00", "updated": "2026-09-25T10:00:16.366642+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-20", "CWE-125"]}