{"id":"CVE-2026-74409","title":"wifi: rtw89: add bounds check on firmware mac_id in link lookup","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw89: add bounds check on firmware mac_id in link lookup\n\nThe mac_id field in RX descriptors is 8 bits wide (0-255), but\nassoc_link_on_macid[] has only RTW89_MAX…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 < ad445de67359f24088d4305c05fbd7e34c4e35e3","Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 < 920101305e7601a33b9e01019f4ca526af2526ae","Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 < 6d88244bb129755acca696f9227200f4a2d106a6","Linux 6.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:55:59.552190Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:43.801Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74409","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"}],"tags":["cve.org"],"epss":0.00375,"epssPercentile":0.29894,"ingestedAt":"2026-10-16T19:46:24.365Z","slug":"CVE-2026-74409","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw89: add bounds check on firmware mac_id in link lookup\n\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.\n\n## Affected\n\n- `Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 < ad445de67359f24088d4305c05fbd7e34c4e35e3`\n- `Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 < 920101305e7601a33b9e01019f4ca526af2526ae`\n- `Linux >= 144c6cd24b3556e6e7a14271cee57a42ebf97450 < 6d88244bb129755acca696f9227200f4a2d106a6`\n- `Linux 6.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}