CVE-2026-74409

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Add a defensive bounds check in\nrtw89_assoc_link_rcu_dereference() to guard against out-of-range\nfirmware values."}], "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 bug is reached when rtw89 processes WiFi RX descriptors or firmware C2H events whose mac_id is taken from device firmware after over-the-air frame reception; per kernel CNA guidance, WiFi driver bugs exploitable via injected/received 802.11 frames are Adjacent, not local or physical.\nAC:L - An adjacent attacker can repeatedly send 802.11 frames (client or softAP role) to drive normal PCI/USB RX and firmware notification paths; no rare victim state, secret, or uncontrollable memory layout is required beyond having WiFi active on an affected rtw89 device.\nPR:N - Exploitation requires only radio-range WiFi access to a victim using the rtw89 driver; the attacker needs no local shell account, kernel capability, or init-namespace root on the target system.\nUI:N - No victim interaction is required at exploitation time; once the interface is operating, malicious over-the-air traffic alone can populate firmware RX/C2H metadata with an out-of-range mac_id and hit the vulnerable lookup.\nS:U - Impact is confined to kernel/driver memory corruption and crashes on the host running rtw89; it does not cross a VM, container, or IOMMU security boundary into another authority.\nC:H - Using an unvalidated firmware mac_id (up to 255, or wider in C2H) as an index performs an out-of-bounds read of assoc_link_on_macid[], interpreting adjacent rtw89_dev fields as a station pointer and enabling further unintended kernel memory reads.\nI:H - The out-of-bounds pointer is dereferenced and used for writes and callbacks (e.g., tid_rx_stats updates, PS flag changes, ieee80211_sta_ps_transition/uapsd), giving memory corruption primitives that could be developed into arbitrary kernel write or code execution.\nA:H - Dereferencing attacker-influenced out-of-bounds pointers from assoc_link_on_macid[] can immediately trigger kernel oops/panic or hang during RX processing on production WiFi clients, softAPs, and hotspots using affected Realtek rtw89 hardware."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/realtek/rtw89/core.h"], "versions": [{"version": "144c6cd24b3556e6e7a14271cee57a42ebf97450", "lessThan": "ad445de67359f24088d4305c05fbd7e34c4e35e3", "status": "affected", "versionType": "git"}, {"version": "144c6cd24b3556e6e7a14271cee57a42ebf97450", "lessThan": "920101305e7601a33b9e01019f4ca526af2526ae", "status": "affected", "versionType": "git"}, {"version": "144c6cd24b3556e6e7a14271cee57a42ebf97450", "lessThan": "6d88244bb129755acca696f9227200f4a2d106a6", "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/realtek/rtw89/core.h"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "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": "6.14", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ad445de67359f24088d4305c05fbd7e34c4e35e3"}, {"url": "https://git.kernel.org/stable/c/920101305e7601a33b9e01019f4ca526af2526ae"}, {"url": "https://git.kernel.org/stable/c/6d88244bb129755acca696f9227200f4a2d106a6"}], "title": "wifi: rtw89: add bounds check on firmware mac_id in link lookup", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74409", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:55:59.552190Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:43.801Z"}}]}}

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Add a defensive bounds check in\nrtw89_assoc_link_rcu_dereference() to guard against out-of-range\nfirmware values."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "6.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "6.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.14"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:46:52.696Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74409", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:05:43.801Z", "dateReserved": "2026-08-15T05:44:03.892Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:59:17.361Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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{"bugzilla": {"description": "kernel: wifi: rtw89: add bounds check on firmware mac_id in link lookup", "id": "2516782", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516782"}, "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: rtw89: add bounds check on firmware mac_id in link lookup\nThe mac_id field in RX descriptors is 8 bits wide (0-255), but\nassoc_link_on_macid[] has only RTW89_MAX_MAC_ID_NUM (128) entries.\nWhile the driver currently assigns mac_id values below 128, the\ndescriptor value comes from firmware and is not validated before use\nas an array index. Add a defensive bounds check in\nrtw89_assoc_link_rcu_dereference() to guard against out-of-range\nfirmware values.", "A flaw was found in the Realtek rtw89 Wi-Fi driver in the Linux kernel. This vulnerability arises from insufficient validation of the `mac_id` field, which is received from firmware and used as an array index. An attacker could potentially craft malicious firmware to provide an out-of-range `mac_id`, leading to an out-of-bounds read. This could result in memory corruption or a denial of service."], "name": "CVE-2026-74409", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74409\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74409\nhttps://lore.kernel.org/linux-cve-announce/2026081510-CVE-2026-74409-e3cf@gregkh/T"], "threat_severity": "Moderate"}

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