{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43347", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.003Z", "datePublished": "2026-05-08T13:39:32.598Z", "dateUpdated": "2026-08-05T12:27:23.879Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:27:23.879Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: dts: qcom: monaco: Reserve full Gunyah metadata region\n\nWe observe spurious \"Synchronous External Abort\" exceptions\n(ESR=0x96000010) and kernel crashes on Monaco-based platforms.\nThese faults are caused by the kernel inadvertently accessing\nhypervisor-owned memory that is not properly marked as reserved.\n\n>From boot log, The Qualcomm hypervisor reports the memory range\nat 0x91a80000 of size 0x80000 (512 KiB) as hypervisor-owned:\nqhee_hyp_assign_remove_memory: 0x91a80000/0x80000 -> ret 0\n\nHowever, the EFI memory map provided by firmware only reserves the\nsubrange 0x91a40000–0x91a87fff (288 KiB). The remaining portion\n(0x91a88000–0x91afffff) is incorrectly reported as conventional\nmemory (from efi debug):\nefi: 0x000091a40000-0x000091a87fff [Reserved...]\nefi: 0x000091a88000-0x0000938fffff [Conventional...]\n\nAs a result, the allocator may hand out PFNs inside the hypervisor\nowned region, causing fatal aborts when the kernel accesses those\naddresses.\n\nAdd a reserved-memory carveout for the Gunyah hypervisor metadata\nat 0x91a80000 (512 KiB) and mark it as no-map so Linux does not\nmap or allocate from this area.\n\nFor the record:\nHyp version: gunyah-e78adb36e debug (2025-11-17 05:38:05 UTC)\nUEFI Ver: 6.0.260122.BOOT.MXF.1.0.c1-00449-KODIAKLA-1" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - On affected Monaco/QCS8300 systems, the unreserved hypervisor-owned PFNs enter the global page allocator, and the reference platform has enabled Ethernet RX paths that allocate pages in response to unauthenticated network traffic. A local memory-pressure trigger also exists, but network reachability is the highest defensible vector.\nAC:L - There is no race or fragile timing requirement; the attacker can repeatedly induce allocations until the allocator hands out one of the bad PFNs. The need for affected hardware/firmware is part of the vulnerable configuration, not attack complexity.\nPR:N - For the network-trigger scenario, sending packets to a reachable interface requires no credentials, capabilities, or prior local account. The allocator and driver path is reached before any application-level authentication.\nUI:N - Exploitation does not require a victim user to open a file, mount anything, or perform an action. Packet delivery or repeated allocation pressure is sufficient.\nS:U - The observed impact is a crash of the Linux kernel on the affected device. The issue does not demonstrate compromise of the Gunyah hypervisor or another security authority.\nC:N - The bug causes attempted access to hypervisor-owned physical pages to abort, not a successful memory read primitive. No evidence indicates disclosure of Linux or hypervisor memory.\nI:N - Although Linux may attempt to allocate, zero, or DMA-map the bad PFNs, the described outcome is a fatal external abort rather than attacker-controlled modification or code execution. No reliable integrity impact is shown.\nA:H - The fix commit reports fatal Synchronous External Abort exceptions and kernel crashes when the kernel accesses these PFNs. Repeated allocation pressure can retrigger the crash, causing high availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/boot/dts/qcom/monaco.dtsi" ], "versions": [ { "version": "7be190e4bdd2bd1aca84afef06bb755c06a85473", "lessThan": "edde62571f7602d83243ca51729ce42d22ea04d2", "status": "affected", "versionType": "git" }, { "version": "7be190e4bdd2bd1aca84afef06bb755c06a85473", "lessThan": "59bd9088336d2bb7e713dcf4df5cbda86bb3c611", "status": "affected", "versionType": "git" }, { "version": "7be190e4bdd2bd1aca84afef06bb755c06a85473", "lessThan": "85d98669fa7f1d3041d962515e45ee6e392db6f8", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/boot/dts/qcom/monaco.dtsi" ], "versions": [ { "version": "6.14", "status": "affected" }, { "version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.14", "versionEndExcluding": "6.18.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.19.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/edde62571f7602d83243ca51729ce42d22ea04d2" }, { "url": "https://git.kernel.org/stable/c/59bd9088336d2bb7e713dcf4df5cbda86bb3c611" }, { "url": "https://git.kernel.org/stable/c/85d98669fa7f1d3041d962515e45ee6e392db6f8" } ], "title": "arm64: dts: qcom: monaco: Reserve full Gunyah metadata region", "x_generator": { "engine": "bippy-1.2.0" } } } }