{"id":"CVE-2026-98703","summary":"wifi: mac80211: minstrel_ht: validate fixed rate index","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: minstrel_ht: validate fixed rate index\n\nThe fixed_rate_idx debugfs file is a plain u32 attribute, so any value\ncan be written to it.  minstrel_ht_update_stats() then copies the value\ninto mi-\u003emax_tp_rate[] and mi-\u003emax_prob_rate, and\nminstrel_ht_set_rate() uses MI_RATE_GROUP()/MI_RATE_IDX() to index\nminstrel_mcs_groups[] (42 entries) and mi-\u003egroups[].rates[] (10 entries)\nwith it.\n\nWriting e.g. 65535 selects group 4095 and rate index 15, far outside\nboth arrays.  The out-of-bounds entries are dereferenced and updated as\nstruct minstrel_rate_stats (retry counts, etc.), so the invalid index\ncorrupts adjacent kernel memory.  With CONFIG_UBSAN_BOUNDS the access is\nreported as an array-index-out-of-bounds in minstrel_ht_set_rate().\n\nOnly a valid group/rate pair, or U32_MAX to disable fixed rate\nprocessing, can be used safely, so reject any other value when the\ndebugfs file is written.\n\nThe file is only reachable through a root-only debugfs mount, so this is\nnot a privilege boundary.  The out-of-bounds access is still a bug that\nmust not be reachable through a writable debugfs attribute.","modified":"2026-10-19T02:46:54.420079638Z","published":"2026-10-18T15:46:33.395Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98703.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/15fb9e3cea55fbc378261ce35a32b0f8828f0000"},{"type":"WEB","url":"https://git.kernel.org/stable/c/42aa9feb27b600809414a3c6b0c650bafba542a9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43082d604a9937b94ceb2e484403956d0f363324"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f8ab6ae1fa360b0191252677f41e781dcb0ffe6e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98703.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98703"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"24f7580e852b5472b51eea322bb78454df0054b8"},{"fixed":"f8ab6ae1fa360b0191252677f41e781dcb0ffe6e"},{"fixed":"42aa9feb27b600809414a3c6b0c650bafba542a9"},{"fixed":"43082d604a9937b94ceb2e484403956d0f363324"},{"fixed":"15fb9e3cea55fbc378261ce35a32b0f8828f0000"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98703.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.56"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98703.json"}}],"schema_version":"1.9.0"}