{"id":"CVE-2026-98889","state":"PUBLISHED","title":"wifi: iwlwifi: mvm: fix sched scan IE sizing","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: fix sched scan IE sizing\n\nScheduled scan built the probe request before iwl_mvm_scan_fits(),\nso oversized IEs could be copied into the fixed preq buffer before\nlength validation. Move iwl_mvm_build_scan_probe() after the fits\ncheck.\n\nAlso advertise max_sched_scan_ie_len using iwl_mvm_max_scan_ie_len()\nso userspace limits account for driver-inserted DS/TPC bytes.","publishedAt":"2026-10-23T11:37:49.469Z","updatedAt":"2026-10-26T06:56:14.362Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"f2268060e99f94314b9988dfa17393c2694fa9b2","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"358eca9a898ad4cce7453e9dcfd005d019a2b01f","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"05f79cea3b15cfe600b205ddcfd51ebee15d908a","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"a24417478f90e9f1a4ea24cd4b784afccb56fbae","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"0a63f98e5163a2ec2822dfb691ee5a6094de08ec","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"4f155d262b31b9b17e0f9856bdabe0968eb4930f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c","drivers/net/wireless/intel/iwlwifi/mvm/scan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c","drivers/net/wireless/intel/iwlwifi/mvm/scan.c"]}],"references":["https://git.kernel.org/stable/c/f2268060e99f94314b9988dfa17393c2694fa9b2","https://git.kernel.org/stable/c/358eca9a898ad4cce7453e9dcfd005d019a2b01f","https://git.kernel.org/stable/c/05f79cea3b15cfe600b205ddcfd51ebee15d908a","https://git.kernel.org/stable/c/a24417478f90e9f1a4ea24cd4b784afccb56fbae","https://git.kernel.org/stable/c/0a63f98e5163a2ec2822dfb691ee5a6094de08ec","https://git.kernel.org/stable/c/4f155d262b31b9b17e0f9856bdabe0968eb4930f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98889.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98889","state":"PUBLISHED","datePublished":"2026-10-23T11:37:49.469Z","dateUpdated":"2026-10-26T06:56:14.362Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.378Z"},"containers":{"cna":{"title":"wifi: iwlwifi: mvm: fix sched scan IE sizing","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: fix sched scan IE sizing\n\nScheduled scan built the probe request before iwl_mvm_scan_fits(),\nso oversized IEs could be copied into the fixed preq buffer before\nlength validation. Move iwl_mvm_build_scan_probe() after the fits\ncheck.\n\nAlso advertise max_sched_scan_ie_len using iwl_mvm_max_scan_ie_len()\nso userspace limits account for driver-inserted DS/TPC bytes."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"f2268060e99f94314b9988dfa17393c2694fa9b2","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"358eca9a898ad4cce7453e9dcfd005d019a2b01f","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"05f79cea3b15cfe600b205ddcfd51ebee15d908a","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"a24417478f90e9f1a4ea24cd4b784afccb56fbae","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"0a63f98e5163a2ec2822dfb691ee5a6094de08ec","versionType":"git"},{"version":"eae94cf82d7456b57fa9fd55c1edb8a726dcc19c","status":"affected","lessThan":"4f155d262b31b9b17e0f9856bdabe0968eb4930f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c","drivers/net/wireless/intel/iwlwifi/mvm/scan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c","drivers/net/wireless/intel/iwlwifi/mvm/scan.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f2268060e99f94314b9988dfa17393c2694fa9b2"},{"url":"https://git.kernel.org/stable/c/358eca9a898ad4cce7453e9dcfd005d019a2b01f"},{"url":"https://git.kernel.org/stable/c/05f79cea3b15cfe600b205ddcfd51ebee15d908a"},{"url":"https://git.kernel.org/stable/c/a24417478f90e9f1a4ea24cd4b784afccb56fbae"},{"url":"https://git.kernel.org/stable/c/0a63f98e5163a2ec2822dfb691ee5a6094de08ec"},{"url":"https://git.kernel.org/stable/c/4f155d262b31b9b17e0f9856bdabe0968eb4930f"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Attacker-controlled bytes enter through NL80211_CMD_START_SCHED_SCAN's NL80211_ATTR_IE, then traverse ieee80211_request_sched_scan_start() to patched iwl_mvm_sched_scan_start() and iwl_mvm_build_scan_probe(); they are not received WiFi frames.\nAC:L - A valid IE stream near the advertised 486-byte limit deterministically overflows because ieee80211_build_preq_ies() adds and can duplicate data per band, while vulnerable iwl_mvm_sched_scan_start() calls iwl_mvm_build_scan_probe() before iwl_mvm_scan_fits(); no race is required.\nPR:L - NL80211_CMD_START_SCHED_SCAN uses GENL_UNS_ADMIN_PERM, which checks CAP_NET_ADMIN in the network namespace's owning user namespace; mac80211 sets WIPHY_FLAG_NETNS_OK, so a wiphy delegated to a user/net namespace is reachable without init-namespace root.\nUI:N - The attacker directly submits the scheduled-scan netlink request against an up, idle interface; no separate victim action is required.\nS:U - The overflow corrupts the host kernel stack inside iwl_mvm_sched_scan_start() and does not cross a VM, IOMMU, or other distinct security authority.\nC:H - The copies can run beyond params.preq.buf through adjacent pointers and beyond the local params object; this attacker-influenced stack corruption can be leveraged for control-flow execution and consequent disclosure of arbitrary kernel memory.\nI:H - iwl_mvm_build_scan_probe() copies attacker-supplied IEs plus per-band generated data into the fixed 512-byte preq.buf without first enforcing iwl_mvm_scan_fits(), producing an attacker-shaped out-of-bounds stack write capable of control-flow hijacking.\nA:H - The overwrite can extend beyond struct iwl_mvm_scan_params into stack control state; stack-protector detection or corrupted return state can oops or panic the kernel."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-26T06:56:14.362Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}