{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43348", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.003Z", "datePublished": "2026-05-08T13:41:51.909Z", "dateUpdated": "2026-05-11T22:22:50.101Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:22:50.101Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmshv_vtl: Fix vmemmap_shift exceeding MAX_FOLIO_ORDER\n\nWhen registering VTL0 memory via MSHV_ADD_VTL0_MEMORY, the kernel\ncomputes pgmap->vmemmap_shift as the number of trailing zeros in the\nOR of start_pfn and last_pfn, intending to use the largest compound\npage order both endpoints are aligned to.\n\nHowever, this value is not clamped to MAX_FOLIO_ORDER, so a\nsufficiently aligned range (e.g. physical range\n[0x800000000000, 0x800080000000), corresponding to start_pfn=0x800000000\nwith 35 trailing zeros) can produce a shift larger than what\nmemremap_pages() accepts, triggering a WARN and returning -EINVAL:\n\n WARNING: ... memremap_pages+0x512/0x650\n requested folio size unsupported\n\nThe MAX_FOLIO_ORDER check was added by\ncommit 646b67d57589 (\"mm/memremap: reject unreasonable folio/compound\npage sizes in memremap_pages()\").\n\nFix this by clamping vmemmap_shift to MAX_FOLIO_ORDER so we always\nrequest the largest order the kernel supports, in those cases, rather\nthan an out-of-range value.\n\nAlso fix the error path to propagate the actual error code from\ndevm_memremap_pages() instead of hard-coding -EFAULT, which was\nmasking the real -EINVAL return."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hv/mshv_vtl_main.c", "include/uapi/linux/mshv.h"], "versions": [{"version": "7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f", "lessThan": "a142ca4b6481e71498712800b20e0c0fcf02843b", "status": "affected", "versionType": "git"}, {"version": "7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f", "lessThan": "404cd6bffe17e25e0f94ed2775ffdd6cd10ac3fd", "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/hv/mshv_vtl_main.c", "include/uapi/linux/mshv.h"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.2", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1-rc1", "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": "6.19", "versionEndExcluding": "7.0.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.1-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a142ca4b6481e71498712800b20e0c0fcf02843b"}, {"url": "https://git.kernel.org/stable/c/404cd6bffe17e25e0f94ed2775ffdd6cd10ac3fd"}], "title": "mshv_vtl: Fix vmemmap_shift exceeding MAX_FOLIO_ORDER", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1BD58F1E-7C20-4C0D-92A2-FAC5CBFBE8A8", "versionEndExcluding": "7.0.2", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmshv_vtl: Fix vmemmap_shift exceeding MAX_FOLIO_ORDER\n\nWhen registering VTL0 memory via MSHV_ADD_VTL0_MEMORY, the kernel\ncomputes pgmap->vmemmap_shift as the number of trailing zeros in the\nOR of start_pfn and last_pfn, intending to use the largest compound\npage order both endpoints are aligned to.\n\nHowever, this value is not clamped to MAX_FOLIO_ORDER, so a\nsufficiently aligned range (e.g. physical range\n[0x800000000000, 0x800080000000), corresponding to start_pfn=0x800000000\nwith 35 trailing zeros) can produce a shift larger than what\nmemremap_pages() accepts, triggering a WARN and returning -EINVAL:\n\n WARNING: ... memremap_pages+0x512/0x650\n requested folio size unsupported\n\nThe MAX_FOLIO_ORDER check was added by\ncommit 646b67d57589 (\"mm/memremap: reject unreasonable folio/compound\npage sizes in memremap_pages()\").\n\nFix this by clamping vmemmap_shift to MAX_FOLIO_ORDER so we always\nrequest the largest order the kernel supports, in those cases, rather\nthan an out-of-range value.\n\nAlso fix the error path to propagate the actual error code from\ndevm_memremap_pages() instead of hard-coding -EFAULT, which was\nmasking the real -EINVAL return."}], "id": "CVE-2026-43348", "lastModified": "2026-05-15T19:27:15.813", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-08T14:16:44.890", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/404cd6bffe17e25e0f94ed2775ffdd6cd10ac3fd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a142ca4b6481e71498712800b20e0c0fcf02843b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mshv_vtl: Fix vmemmap_shift exceeding MAX_FOLIO_ORDER", "id": "2468078", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468078"}, "csaw": false, "cwe": "CWE-1285", "details": ["A flaw was found in the Linux kernel's `mshv_vtl` component. When registering VTL0 memory, an issue with memory mapping calculations can cause the system to trigger a warning and return an invalid argument error. This could lead to system instability or a denial of service (DoS), preventing legitimate memory operations."], "name": "CVE-2026-43348", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43348\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43348\nhttps://lore.kernel.org/linux-cve-announce/2026050855-CVE-2026-43348-5331@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f,a142ca4b6481e71498712800b20e0c0fcf02843b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f,404cd6bffe17e25e0f94ed2775ffdd6cd10ac3fd)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.2,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-08T18:30:06.359676+00:00", "updated": "2026-05-15T20:30:06.376422+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}