{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93063", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T15:57:05.660Z", "datePublished": "2026-09-17T16:10:49.112Z", "dateUpdated": "2026-10-19T09:04:59.220Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:04:59.220Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/intel/iwlwifi/mei/main.c" ], "versions": [ { "version": "a29e442ee110aafdf7785fac6de44b22d3da43db", "lessThan": "a4034f1cc8a422cefc519290d8e6cfb7ff773586", "status": "affected", "versionType": "git" }, { "version": "bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e", "lessThan": "b90ebae632318dc2e5cd4ac96e454ec50f705579", "status": "affected", "versionType": "git" }, { "version": "bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e", "lessThan": "9c6bea89a16815688a5240dd4a74c922a92fcdc3", "status": "affected", "versionType": "git" }, { "version": "bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e", "lessThan": "242125bbf19a2974d22f3d5025c9c14c0a4aea58", "status": "affected", "versionType": "git" }, { "version": "bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e", "lessThan": "f7f770d12e6e928006f89a59291074e5fea82886", "status": "affected", "versionType": "git" }, { "version": "bcd68b3dbe78b7b0f7b6b55162cf1eff1e7fff9e", "lessThan": "7d8cc301bcba233f31b589a45f4c1c97f2bb90d6", "status": "affected", "versionType": "git" }, { "version": "9f71cebcac2148e68d0d67f113d0f9aabfcc7a2a", "status": "affected", "versionType": "git" }, { "version": "6.1.2", "lessThan": "6.1.188", "status": "affected", "versionType": "semver" }, { "version": "6.0.16", "lessThan": "6.1", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/intel/iwlwifi/mei/main.c" ], "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "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" } ] } ] } ], "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" } ], "title": "wifi: iwlwifi: mei: check SAP message length before reading it", "x_generator": { "engine": "bippy-1.2.0" } } } }