{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93796", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-18T17:59:28.789Z", "datePublished": "2026-09-24T16:02:29.478Z", "dateUpdated": "2026-10-21T12:52:37.563Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:52:37.563Z" }, "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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH" }, "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() → iwl_run_init_mvm_ucode() → 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->rxq, 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'd rxq, or a second iwl_pcie_rx_free() of the same pointers from iwl_trans_pcie_free(), is a kernel oops or panic." } ] } ], "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/pcie/gen1_2/rx.c" ], "versions": [ { "version": "9cf671d60fdbeb8f875859c11148cf13c326ada2", "lessThan": "c422d5d53f135ea987f745773953a91f9fe30c3f", "status": "affected", "versionType": "git" }, { "version": "9cf671d60fdbeb8f875859c11148cf13c326ada2", "lessThan": "6ec5bf430cf7466cb412e47f2761594092781fac", "status": "affected", "versionType": "git" }, { "version": "9cf671d60fdbeb8f875859c11148cf13c326ada2", "lessThan": "3456c5bcc987aeb182e50e30c9b02be8420e9953", "status": "affected", "versionType": "git" }, { "version": "9cf671d60fdbeb8f875859c11148cf13c326ada2", "lessThan": "2c79d7a7b583050c9f58041465cb46fe3483ab5d", "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/pcie/gen1_2/rx.c" ], "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "lessThan": "5.12", "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": "5.12", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "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" } } } }