{"id":"AZL-109382","summary":"CVE-2026-98703 affecting package kernel 6.6.157.1-1","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":"2026-10-19T14:17:05.832688992Z","published":"2026-10-18T16:17:23Z","upstream":["CVE-2026-98703"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98703"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.157.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-109382.json"}}],"schema_version":"1.9.0"}