{"id":"CVE-2026-93063","state":"PUBLISHED","title":"wifi: iwlwifi: mei: check SAP message length before reading it","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mei: check SAP message length before reading it\n\nVerify the SAP message size is not larger than the local buffer before\nreading the message to avoid buffer overflow.","publishedAt":"2026-09-17T16:10:49.112Z","updatedAt":"2026-10-19T09:04:59.220Z","severity":{"score":8.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/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":"a29e442ee110aafdf7785fac6de44b22d3da43db","status":"affected","lessThan":"a4034f1cc8a422cefc519290d8e6cfb7ff773586","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"b90ebae632318dc2e5cd4ac96e454ec50f705579","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"9c6bea89a16815688a5240dd4a74c922a92fcdc3","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"242125bbf19a2974d22f3d5025c9c14c0a4aea58","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"f7f770d12e6e928006f89a59291074e5fea82886","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"7d8cc301bcba233f31b589a45f4c1c97f2bb90d6","versionType":"git"},{"version":"9f71cebcac2148e68d0d67f113d0f9aabfcc7a2a","status":"affected","versionType":"git"},{"version":"6.1.2","status":"affected","lessThan":"6.1.188","versionType":"semver"},{"version":"6.0.16","status":"affected","lessThan":"6.1","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mei/main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","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":["drivers/net/wireless/intel/iwlwifi/mei/main.c"]}],"references":["https://git.kernel.org/stable/c/a4034f1cc8a422cefc519290d8e6cfb7ff773586","https://git.kernel.org/stable/c/b90ebae632318dc2e5cd4ac96e454ec50f705579","https://git.kernel.org/stable/c/9c6bea89a16815688a5240dd4a74c922a92fcdc3","https://git.kernel.org/stable/c/242125bbf19a2974d22f3d5025c9c14c0a4aea58","https://git.kernel.org/stable/c/f7f770d12e6e928006f89a59291074e5fea82886","https://git.kernel.org/stable/c/7d8cc301bcba233f31b589a45f4c1c97f2bb90d6"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93063.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93063","state":"PUBLISHED","datePublished":"2026-09-17T16:10:49.112Z","dateUpdated":"2026-10-19T09:04:59.220Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T15:57:05.660Z"},"containers":{"cna":{"title":"wifi: iwlwifi: mei: check SAP message length before reading it","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mei: check SAP message length before reading it\n\nVerify the SAP message size is not larger than the local buffer before\nreading the message to avoid buffer overflow."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a29e442ee110aafdf7785fac6de44b22d3da43db","status":"affected","lessThan":"a4034f1cc8a422cefc519290d8e6cfb7ff773586","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"b90ebae632318dc2e5cd4ac96e454ec50f705579","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"9c6bea89a16815688a5240dd4a74c922a92fcdc3","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"242125bbf19a2974d22f3d5025c9c14c0a4aea58","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"f7f770d12e6e928006f89a59291074e5fea82886","versionType":"git"},{"version":"bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e","status":"affected","lessThan":"7d8cc301bcba233f31b589a45f4c1c97f2bb90d6","versionType":"git"},{"version":"9f71cebcac2148e68d0d67f113d0f9aabfcc7a2a","status":"affected","versionType":"git"},{"version":"6.1.2","status":"affected","lessThan":"6.1.188","versionType":"semver"},{"version":"6.0.16","status":"affected","lessThan":"6.1","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mei/main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","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":["drivers/net/wireless/intel/iwlwifi/mei/main.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a4034f1cc8a422cefc519290d8e6cfb7ff773586"},{"url":"https://git.kernel.org/stable/c/b90ebae632318dc2e5cd4ac96e454ec50f705579"},{"url":"https://git.kernel.org/stable/c/9c6bea89a16815688a5240dd4a74c922a92fcdc3"},{"url":"https://git.kernel.org/stable/c/242125bbf19a2974d22f3d5025c9c14c0a4aea58"},{"url":"https://git.kernel.org/stable/c/f7f770d12e6e928006f89a59291074e5fea82886"},{"url":"https://git.kernel.org/stable/c/7d8cc301bcba233f31b589a45f4c1c97f2bb90d6"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The oversized iwl_sap_hdr.len is written by CSME into the DMA-mapped ME-to-host SAP notification queue and consumed in iwl_mei_handle_sap_rx_cmd after iwl_mei_rx() handles SAP_ME_MSG_CHECK_SHARED_AREA on the MEI RX callback (mei_cldev_register_rx_cb). 802.11 frames use the separate data queue and iwl_mei_handle_sap_data(), so this is a local coprocessor path.\nAC:L - CSME fully controls the little-endian hdr->len used as the memcpy length in iwl_mei_read_from_q(). The valid_rx_sz check only keeps the copy inside the 62720-byte SAP_M2H_NOTIF_Q_SZ, which still far exceeds the alloc_page() destination, so an oversized len overflows that page deterministically with no race.\nPR:N - iwl_mei_enable() registers iwl_mei_rx as the MEI RX callback at probe with no Linux credential or capability check. Compromised CSME firmware can emit SAP_ME_MSG_CHECK_SHARED_AREA and a crafted notification without any host account.\nUI:N - iwl_mei_probe() maps shared memory, enables the MEI client, and sends SAP_ME_MSG_START; CSME can then post CHECK_SHARED_AREA and the oversized notification on its own. No victim open, mount, or click is required.\nS:U - The overflow writes past a host-kernel alloc_page() buffer into adjacent pages in the same kernel that contains iwlmei. The mei_cldev_dma_map() window is the intended CSME shared area, not an IOMMU bypass, VM escape, or other changed-scope boundary.\nC:H - iwl_mei_read_from_q() copies tens of KB of CSME-chosen payload past the 4 KiB page into neighboring page-allocator contents. That kernel-memory corruption is leverageable for high-confidentiality disclosure of adjacent objects.\nI:H - The same memcpy is an out-of-bounds write of CSME-controlled bytes past the alloc_page() buffer into adjacent kernel pages, a primitive that can corrupt neighboring objects and hijack kernel control flow.\nA:H - Writing tens of KB past a single alloc_page() into unmapped or neighboring pages produces a kernel oops or panic in iwl_mei_handle_sap_rx_cmd, so availability impact is high."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:04:59.220Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.2","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}