{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90341", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.804Z", "datePublished": "2026-09-17T16:08:52.307Z", "dateUpdated": "2026-10-19T09:01:58.280Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:01:58.280Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: coreboot: Validate table bounds\n\nThe existing coreboot_table_populate() bounds checks limit individual\nentries to the mapped length. However, coreboot_table_probe() replaces\nthe platform resource length with header and table sizes supplied by\nfirmware before mapping the full table.\n\nA malformed table can overflow the 32-bit size addition or advertise an\nextent beyond the resource, causing the driver to map and parse memory\noutside the resource. A resource shorter than the fixed header is also\nmapped as though it contained a complete header.\n\nReject resources shorter than the fixed header. After validating the\nsignature, require a complete header, calculate the advertised extent\nwith overflow checking, and reject extents beyond the resource before\nremapping the table." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.7, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The triggering fields are header->header_bytes and header->table_bytes in the LBIO table, read by coreboot_table_probe() after platform_get_resource(pdev, IORESOURCE_MEM, 0) from ACPI GOOGCB00/BOOT0000 _CRS or the OF /firmware/coreboot reg; those bytes come from firmware, not a network protocol message.\nAC:L - coreboot_table_probe() replaces resource_size(res) with the u32 sum header_bytes+table_bytes before memremap() and coreboot_table_populate(); firmware that sets that sum past the ACPI/DT window, or a resource shorter than sizeof(*header), hits the over-map on every bind with no race.\nPR:N - coreboot_table_probe() is the coreboot_table platform_driver probe from subsys_initcall, with no capable() or credential check; a malformed LBIO header at the GOOGCB00/coreboot MEM resource is parsed automatically, so no Linux account or user-namespace capability is required.\nUI:N - Binding the GOOGCB00/BOOT0000 or compatible=\"coreboot\" platform device calls coreboot_table_probe() during boot or module load; the oversized memremap() happens on that probe with no mount, open, or other victim action.\nS:U - The oversized memremap() in coreboot_table_probe() and the memcpy() in coreboot_table_populate() stay in this kernel's coreboot table parser; this is not a KVM/Xen guest-to-host, IOMMU, or sandbox boundary crossing.\nC:H - memremap(res->start, header_bytes+table_bytes) then coreboot_table_populate() memcpy's each entry->size from that mapping into a kmalloc'd coreboot_device; table_bytes is an unconstrained u32, so this is an unbounded over-read of physical memory past the ACPI/DT resource, not a few-byte leak.\nI:N - coreboot_table_populate() copies into kzalloc(sizeof(device->dev)+entry->size) using the same entry->size already checked against the (oversize) mapping, so the destination matches the copy; this path has no out-of-bounds write or control-flow hijack primitive.\nA:H - try_ram_remap() in memremap() returns __va(res->start) after checking only the first pfn, so populate's walk of a table_bytes that extends past the reserved coreboot table/CBMEM window can fault on a linear-map hole or mixed RAM/MMIO range and oops or panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/firmware/google/coreboot_table.c" ], "versions": [ { "version": "d384d6f43d1ec3f1225ab0275fd592c5980bd830", "lessThan": "3cca0d6dd4c2636d2514234233cb02db76621607", "status": "affected", "versionType": "git" }, { "version": "d384d6f43d1ec3f1225ab0275fd592c5980bd830", "lessThan": "f79f621215a0944c4a0e1b3b86b99e433ae8c527", "status": "affected", "versionType": "git" }, { "version": "d384d6f43d1ec3f1225ab0275fd592c5980bd830", "lessThan": "d848fac90c6f0566e7b93066b0b86024f65f395e", "status": "affected", "versionType": "git" }, { "version": "d384d6f43d1ec3f1225ab0275fd592c5980bd830", "lessThan": "88027241c1d2c3213bac937a1c2cb89a5775a413", "status": "affected", "versionType": "git" }, { "version": "d384d6f43d1ec3f1225ab0275fd592c5980bd830", "lessThan": "fd93859ecfa5b6495a6863c18fd923a7666def26", "status": "affected", "versionType": "git" }, { "version": "d384d6f43d1ec3f1225ab0275fd592c5980bd830", "lessThan": "2d98a3b89394f283f054a4a54587c14ee89acaf9", "status": "affected", "versionType": "git" }, { "version": "d384d6f43d1ec3f1225ab0275fd592c5980bd830", "lessThan": "e82f260a74dea8cdd7857f2cc66f73d0da522bb3", "status": "affected", "versionType": "git" }, { "version": "d384d6f43d1ec3f1225ab0275fd592c5980bd830", "lessThan": "a58a57a1076f8c5dae0327e3710899478c3be901", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/firmware/google/coreboot_table.c" ], "versions": [ { "version": "4.12", "status": "affected" }, { "version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "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": "4.12", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3cca0d6dd4c2636d2514234233cb02db76621607" }, { "url": "https://git.kernel.org/stable/c/f79f621215a0944c4a0e1b3b86b99e433ae8c527" }, { "url": "https://git.kernel.org/stable/c/d848fac90c6f0566e7b93066b0b86024f65f395e" }, { "url": "https://git.kernel.org/stable/c/88027241c1d2c3213bac937a1c2cb89a5775a413" }, { "url": "https://git.kernel.org/stable/c/fd93859ecfa5b6495a6863c18fd923a7666def26" }, { "url": "https://git.kernel.org/stable/c/2d98a3b89394f283f054a4a54587c14ee89acaf9" }, { "url": "https://git.kernel.org/stable/c/e82f260a74dea8cdd7857f2cc66f73d0da522bb3" }, { "url": "https://git.kernel.org/stable/c/a58a57a1076f8c5dae0327e3710899478c3be901" } ], "title": "firmware: coreboot: Validate table bounds", "x_generator": { "engine": "bippy-1.2.0" } } } }