{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31590", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.120Z", "datePublished": "2026-04-24T14:42:17.629Z", "dateUpdated": "2026-04-27T13:56:36.186Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-27T13:56:36.186Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION\n\nDrop the WARN in sev_pin_memory() on npages overflowing an int, as the\nWARN is comically trivially to trigger from userspace, e.g. by doing:\n\n struct kvm_enc_region range = {\n .addr = 0,\n .size = -1ul,\n };\n\n __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range);\n\nNote, the checks in sev_mem_enc_register_region() that presumably exist to\nverify the incoming address+size are completely worthless, as both \"addr\"\nand \"size\" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater\nthan ULONG_MAX. That wart will be cleaned up in the near future.\n\n\tif (range->addr > ULONG_MAX || range->size > ULONG_MAX)\n\t\treturn -EINVAL;\n\nOpportunistically add a comment to explain why the code calculates the\nnumber of pages the \"hard\" way, e.g. instead of just shifting @ulen."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/svm/sev.c"], "versions": [{"version": "78824fabc72e5e37d51e6e567fde70a4fc41a6d7", "lessThan": "b670833749ffd8681361db2bb047c6f2e3075f3a", "status": "affected", "versionType": "git"}, {"version": "78824fabc72e5e37d51e6e567fde70a4fc41a6d7", "lessThan": "ab423e5892826202a660b5ac85d1125b0e8301a5", "status": "affected", "versionType": "git"}, {"version": "78824fabc72e5e37d51e6e567fde70a4fc41a6d7", "lessThan": "28cc13ca20431b127d42d84ba10898d03e2c8267", "status": "affected", "versionType": "git"}, {"version": "78824fabc72e5e37d51e6e567fde70a4fc41a6d7", "lessThan": "c29ff288a2d97a6f4640a498a367cf0eb91312eb", "status": "affected", "versionType": "git"}, {"version": "78824fabc72e5e37d51e6e567fde70a4fc41a6d7", "lessThan": "1cba4dcd795daf6d257122779fb6a349edf03914", "status": "affected", "versionType": "git"}, {"version": "78824fabc72e5e37d51e6e567fde70a4fc41a6d7", "lessThan": "8acffeef5ef720c35e513e322ab08e32683f32f2", "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/x86/kvm/svm/sev.c"], "versions": [{"version": "5.9", "status": "affected"}, {"version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.83", "lessThanOrEqual": "6.12.*", "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": "7.0.1", "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": "5.9", "versionEndExcluding": "6.6.136"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.12.83"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.18.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.19.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.0.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.1-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b670833749ffd8681361db2bb047c6f2e3075f3a"}, {"url": "https://git.kernel.org/stable/c/ab423e5892826202a660b5ac85d1125b0e8301a5"}, {"url": "https://git.kernel.org/stable/c/28cc13ca20431b127d42d84ba10898d03e2c8267"}, {"url": "https://git.kernel.org/stable/c/c29ff288a2d97a6f4640a498a367cf0eb91312eb"}, {"url": "https://git.kernel.org/stable/c/1cba4dcd795daf6d257122779fb6a349edf03914"}, {"url": "https://git.kernel.org/stable/c/8acffeef5ef720c35e513e322ab08e32683f32f2"}], "title": "KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION\n\nDrop the WARN in sev_pin_memory() on npages overflowing an int, as the\nWARN is comically trivially to trigger from userspace, e.g. by doing:\n\n struct kvm_enc_region range = {\n .addr = 0,\n .size = -1ul,\n };\n\n __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range);\n\nNote, the checks in sev_mem_enc_register_region() that presumably exist to\nverify the incoming address+size are completely worthless, as both \"addr\"\nand \"size\" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater\nthan ULONG_MAX. That wart will be cleaned up in the near future.\n\n\tif (range->addr > ULONG_MAX || range->size > ULONG_MAX)\n\t\treturn -EINVAL;\n\nOpportunistically add a comment to explain why the code calculates the\nnumber of pages the \"hard\" way, e.g. instead of just shifting @ulen."}], "id": "CVE-2026-31590", "lastModified": "2026-04-27T14:16:44.007", "metrics": {}, "published": "2026-04-24T15:16:36.170", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1cba4dcd795daf6d257122779fb6a349edf03914"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/28cc13ca20431b127d42d84ba10898d03e2c8267"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8acffeef5ef720c35e513e322ab08e32683f32f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ab423e5892826202a660b5ac85d1125b0e8301a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b670833749ffd8681361db2bb047c6f2e3075f3a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c29ff288a2d97a6f4640a498a367cf0eb91312eb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION", "id": "2461540", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461540"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in the Linux kernel, specifically within the Kernel-based Virtual Machine (KVM) subsystem's Secure Encrypted Virtualization (SEV) feature. A local user could exploit this vulnerability by providing an excessively large memory region size when using the KVM_MEMORY_ENCRYPT_REG_REGION command. This action could trigger a kernel warning, potentially leading to system instability or consuming excessive system resources. The primary impact of this flaw is a Denial of Service (DoS), where legitimate system operations could be disrupted."], "name": "CVE-2026-31590", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31590\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31590\nhttps://lore.kernel.org/linux-cve-announce/2026042414-CVE-2026-31590-a7e3@gregkh/T"], "threat_severity": "Moderate"}