{"id":"CVE-2026-43172","state":"PUBLISHED","title":"wifi: iwlwifi: fix 22000 series SMEM parsing","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: fix 22000 series SMEM parsing\n\nIf the firmware were to report three LMACs (which doesn't\nexist in hardware) then using \"fwrt->smem_cfg.lmac[2]\" is\nan overrun of the array. Reject such and use IWL_FW_CHECK\ninstead of WARN_ON in this function.","publishedAt":"2026-05-06T11:27:47.358Z","updatedAt":"2026-10-21T12:40:12.169Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/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":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"5cc021586420c5e13acc65da5bf73edd451e2c3e","versionType":"git"},{"version":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"b23c7cd616a6a113363be707b7b9e4bc41b18a07","versionType":"git"},{"version":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"1d49a42717bdc8de77eabeb5b7d3e88d141ffea9","versionType":"git"},{"version":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"2b4b1510aaaf5b9fb57327ecffc20c055f61f205","versionType":"git"},{"version":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"58192b9ce09b0f0f86e2036683bd542130b91a98","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/fw/smem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.8","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","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/fw/smem.c"]}],"references":["https://git.kernel.org/stable/c/5cc021586420c5e13acc65da5bf73edd451e2c3e","https://git.kernel.org/stable/c/b23c7cd616a6a113363be707b7b9e4bc41b18a07","https://git.kernel.org/stable/c/1d49a42717bdc8de77eabeb5b7d3e88d141ffea9","https://git.kernel.org/stable/c/2b4b1510aaaf5b9fb57327ecffc20c055f61f205","https://git.kernel.org/stable/c/58192b9ce09b0f0f86e2036683bd542130b91a98"],"weaknesses":["CWE-129"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43172.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43172","state":"PUBLISHED","datePublished":"2026-05-06T11:27:47.358Z","dateUpdated":"2026-10-21T12:40:12.169Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.991Z"},"containers":{"cna":{"title":"wifi: iwlwifi: fix 22000 series SMEM parsing","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: fix 22000 series SMEM parsing\n\nIf the firmware were to report three LMACs (which doesn't\nexist in hardware) then using \"fwrt->smem_cfg.lmac[2]\" is\nan overrun of the array. Reject such and use IWL_FW_CHECK\ninstead of WARN_ON in this function."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"5cc021586420c5e13acc65da5bf73edd451e2c3e","versionType":"git"},{"version":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"b23c7cd616a6a113363be707b7b9e4bc41b18a07","versionType":"git"},{"version":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"1d49a42717bdc8de77eabeb5b7d3e88d141ffea9","versionType":"git"},{"version":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"2b4b1510aaaf5b9fb57327ecffc20c055f61f205","versionType":"git"},{"version":"ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424","status":"affected","lessThan":"58192b9ce09b0f0f86e2036683bd542130b91a98","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/fw/smem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.8","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","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/fw/smem.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5cc021586420c5e13acc65da5bf73edd451e2c3e"},{"url":"https://git.kernel.org/stable/c/b23c7cd616a6a113363be707b7b9e4bc41b18a07"},{"url":"https://git.kernel.org/stable/c/1d49a42717bdc8de77eabeb5b7d3e88d141ffea9"},{"url":"https://git.kernel.org/stable/c/2b4b1510aaaf5b9fb57327ecffc20c055f61f205"},{"url":"https://git.kernel.org/stable/c/58192b9ce09b0f0f86e2036683bd542130b91a98"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The vulnerable path is in the Wi-Fi device/firmware control path during iwlwifi start/restart when the host parses a firmware-supplied SHARED_MEM_CFG_CMD response, not a routed IP service. For the affected Wi-Fi subsystem, the highest reasonable external exposure is an adjacent wireless attacker able to drive malicious firmware/device behavior.\nAC:L - There is no race or complex state requirement once a malformed response is supplied. Setting lmac_num to 3 deterministically reaches the out-of-bounds write in the 22000-series parser.\nPR:N - The malformed firmware response is parsed by the kernel driver without OS credential checks and before any Wi-Fi peer authentication boundary matters. In the adjacent attacker model, no local account or kernel privilege is required.\nUI:N - The parser runs automatically during normal Wi-Fi device start or restart. Exploitation does not require a victim to open a file, mount anything, or perform a special action.\nS:U - The corruption affects host kernel iwlwifi driver state within the same kernel security authority. It does not inherently cross a VM, IOMMU, or separate authorization boundary.\nC:H - The bug is an attacker-controlled out-of-bounds write past fwrt->smem_cfg.lmac into adjacent iwl_fw_runtime state. Kernel memory corruption is reasonably leverageable for high confidentiality impact.\nI:H - Firmware-controlled 32-bit values are written beyond the two-element LMAC array into adjacent kernel driver fields. This is an out-of-bounds write with potential for arbitrary kernel state modification or control-flow influence.\nA:H - Even without full exploitation, corrupting adjacent iwlwifi runtime/debug/workqueue state can crash or destabilize the kernel. Kernel oops, panic, or persistent Wi-Fi driver failure constitutes high availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:40:12.169Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-43172","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:15:17.444168Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-129","lang":"en","type":"CWE","description":"CWE-129 Improper Validation of Array Index"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:16:22.626Z"}}]}}}