{"id":"CVE-2026-80943","summary":"wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtlwifi: rtl8192du: check QoS TID before indexing tids\n\nrtl92du_tx_fill_desc() uses ieee80211_get_tid() to read the QoS TID\nfrom the 802.11 header and then uses it as an index into\nsta_entry-\u003etids[]. ieee80211_get_tid() returns the low 4-bit QoS TID\nvalue, so the result can be in the range 0..15.\n\nrtlwifi only allocates MAX_TID_COUNT entries for sta_entry-\u003etids[], and\nMAX_TID_COUNT is 9. A QoS TID greater than 8 therefore indexes past the\naggregation state array. Keep the default RTL_AGG_STOP state for\nout-of-range TIDs, matching rtl92cu_tx_fill_desc().\n\nThis issue was detected by our static analysis tool and confirmed by\nmanual audit. UBSAN validation for the same bug pattern reports an\narray-index-out-of-bounds access with index 10 for type\n'rtl_tid_data [9]'.","modified":"2026-09-15T03:30:55.543467985Z","published":"2026-09-11T19:42:15.341Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80943.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c0b374e12d52af23ca741728db31091677cf9dc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/42785f7e8d31540e6172bbcf08a7cc3cae1086f8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e327f14e1c43e175bf530f9165b2cadff308553"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed4f05d9f2f42fd866f55108db8123eefcc5fb33"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80943.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80943"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8321424134a400a5e3eb39f9acca6bc6946ff447"},{"fixed":"6e327f14e1c43e175bf530f9165b2cadff308553"},{"fixed":"0c0b374e12d52af23ca741728db31091677cf9dc"},{"fixed":"42785f7e8d31540e6172bbcf08a7cc3cae1086f8"},{"fixed":"ed4f05d9f2f42fd866f55108db8123eefcc5fb33"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80943.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.11.0"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80943.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"}]}