{"api_version":"1","generated_at":"2026-10-27T04:01:48+00:00","cve":"CVE-2026-93793","urls":{"html":"https://cve.report/CVE-2026-93793","api":"https://cve.report/api/cve/CVE-2026-93793.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93793","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93793"},"summary":{"title":"wifi: iwlwifi: mvm: validate TX_CMD response layout","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-24 17:17:12","updated_at":"2026-10-21 13:21:07"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b","name":"https://git.kernel.org/stable/c/fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4d942dfc13aec393e003ab28ff58db744c26e6eb","name":"https://git.kernel.org/stable/c/4d942dfc13aec393e003ab28ff58db744c26e6eb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8d70881707b47353359df57df12f6de67fdacdd2","name":"https://git.kernel.org/stable/c/8d70881707b47353359df57df12f6de67fdacdd2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5e871c03506c529d5fe372d099c1ad1465c7bc38","name":"https://git.kernel.org/stable/c/5e871c03506c529d5fe372d099c1ad1465c7bc38","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93793","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93793","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c 5e871c03506c529d5fe372d099c1ad1465c7bc38 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c fc14f5fe8a4374ed1088cfbddc1dae4d16c9935b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c 4d942dfc13aec393e003ab28ff58db744c26e6eb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8ca151b568b67a7b72dcfc6ee6ea7c107ddd795c 8d70881707b47353359df57df12f6de67fdacdd2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.160 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"93793","cve":"CVE-2026-93793","epss":"0.002390000","percentile":"0.140990000","score_date":"2026-10-21","updated_at":"2026-10-22 00:15:10"},"legacy_qids":[]},"source_records":{"cve_program":{"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":"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":"6.6.*","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":"6.6.160","versionStartIncluding":"3.9","vulnerable":true},{"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'd from the Intel WiFi NIC: iwl_pcie_rx_handle() → iwl_op_mode_rx() → iwl_mvm_rx()/iwl_mvm_rx_mq() → iwl_mvm_rx_common() → 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."}]}],"providerMetadata":{"dateUpdated":"2026-10-21T12:52:36.442Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}}},"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":"2026-10-21T12:52:36.442Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-24 17:17:12","lastModifiedDate":"2026-10-21 13:21:07","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93793","Ordinal":"1","Title":"wifi: iwlwifi: mvm: validate TX_CMD response layout","CVE":"CVE-2026-93793","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93793","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"wifi: iwlwifi: mvm: validate TX_CMD response layout"}]}}}