{"id":"CVE-2026-98703","state":"PUBLISHED","title":"wifi: mac80211: minstrel_ht: validate fixed rate index","description":"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->max_tp_rate[] and mi->max_prob_rate, and\nminstrel_ht_set_rate() uses MI_RATE_GROUP()/MI_RATE_IDX() to index\nminstrel_mcs_groups[] (42 entries) and mi->groups[].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.","publishedAt":"2026-10-18T15:46:33.395Z","updatedAt":"2026-10-30T12:38:53.843Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"63097bf1b7f17f14bd9ffcae6590c63272da8bb0","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"9b685cfb5cc8ed57991b1a956b06c6658d7cf455","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"eebc70f132041b35da9ec74d5d395083125289b2","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"f8ab6ae1fa360b0191252677f41e781dcb0ffe6e","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"42aa9feb27b600809414a3c6b0c650bafba542a9","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"43082d604a9937b94ceb2e484403956d0f363324","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"15fb9e3cea55fbc378261ce35a32b0f8828f0000","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/rc80211_minstrel_ht.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.1","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/rc80211_minstrel_ht.c"]}],"references":["https://git.kernel.org/stable/c/63097bf1b7f17f14bd9ffcae6590c63272da8bb0","https://git.kernel.org/stable/c/9b685cfb5cc8ed57991b1a956b06c6658d7cf455","https://git.kernel.org/stable/c/eebc70f132041b35da9ec74d5d395083125289b2","https://git.kernel.org/stable/c/f8ab6ae1fa360b0191252677f41e781dcb0ffe6e","https://git.kernel.org/stable/c/42aa9feb27b600809414a3c6b0c650bafba542a9","https://git.kernel.org/stable/c/43082d604a9937b94ceb2e484403956d0f363324","https://git.kernel.org/stable/c/15fb9e3cea55fbc378261ce35a32b0f8828f0000"],"weaknesses":[],"ingestedAt":"2026-10-30T12:58:04.520Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98703.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98703","state":"PUBLISHED","datePublished":"2026-10-18T15:46:33.395Z","dateUpdated":"2026-10-30T12:38:53.843Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.365Z"},"containers":{"cna":{"title":"wifi: mac80211: minstrel_ht: validate fixed rate index","descriptions":[{"lang":"en","value":"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->max_tp_rate[] and mi->max_prob_rate, and\nminstrel_ht_set_rate() uses MI_RATE_GROUP()/MI_RATE_IDX() to index\nminstrel_mcs_groups[] (42 entries) and mi->groups[].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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"63097bf1b7f17f14bd9ffcae6590c63272da8bb0","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"9b685cfb5cc8ed57991b1a956b06c6658d7cf455","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"eebc70f132041b35da9ec74d5d395083125289b2","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"f8ab6ae1fa360b0191252677f41e781dcb0ffe6e","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"42aa9feb27b600809414a3c6b0c650bafba542a9","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"43082d604a9937b94ceb2e484403956d0f363324","versionType":"git"},{"version":"24f7580e852b5472b51eea322bb78454df0054b8","status":"affected","lessThan":"15fb9e3cea55fbc378261ce35a32b0f8828f0000","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/rc80211_minstrel_ht.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.1","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/rc80211_minstrel_ht.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/63097bf1b7f17f14bd9ffcae6590c63272da8bb0"},{"url":"https://git.kernel.org/stable/c/9b685cfb5cc8ed57991b1a956b06c6658d7cf455"},{"url":"https://git.kernel.org/stable/c/eebc70f132041b35da9ec74d5d395083125289b2"},{"url":"https://git.kernel.org/stable/c/f8ab6ae1fa360b0191252677f41e781dcb0ffe6e"},{"url":"https://git.kernel.org/stable/c/42aa9feb27b600809414a3c6b0c650bafba542a9"},{"url":"https://git.kernel.org/stable/c/43082d604a9937b94ceb2e484403956d0f363324"},{"url":"https://git.kernel.org/stable/c/15fb9e3cea55fbc378261ce35a32b0f8828f0000"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:38:53.843Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}