{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2022-49883",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-05-01T14:05:17.241Z",
        "datePublished": "2025-05-01T14:10:29.804Z",
        "dateUpdated": "2026-08-05T08:56:31.933Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T08:56:31.933Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: smm: number of GPRs in the SMRAM image depends on the image format\n\nOn 64 bit host, if the guest doesn't have X86_FEATURE_LM, KVM will\naccess 16 gprs to 32-bit smram image, causing out-ouf-bound ram\naccess.\n\nOn 32 bit host, the rsm_load_state_64/enter_smm_save_state_64\nis compiled out, thus access overflow can't happen."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                        "baseScore": 7.1,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - Exploitation requires local access to KVM (/dev/kvm ioctls) to create a non-LM guest with SMM, inject SMI, and execute RSM; it is not reachable via network packets.\nAC:L - An attacker who can use KVM fully controls CPUID (clearing X86_FEATURE_LM), SMM enablement, SMI injection, and RSM execution, so the OOB path is reliably triggerable with no race or uncontrolled condition.\nPR:L - Creating and running a KVM VM needs only access to /dev/kvm (kvm group or world-accessible on some distros), not real host root/CAP_SYS_ADMIN in the init namespace.\nUI:N - No separate victim action is required; the attacker drives the VM, injects SMI, and executes RSM themselves.\nS:U - The reliable impact is host-kernel stack disclosure into vCPU GPRs recovered via KVM_GET_REGS by host userspace, remaining within the same host OS security authority rather than a guest-observable VM escape.\nC:H - rsm_load_state_32() reads 16 bytes past em_rsm()'s stack buf[512] (GET_SMSTATE offsets for GPRs 12–15) and writeback stores that host stack data into vCPU R12–R15, which KVM_GET_REGS exposes (pointers/canaries possible).\nI:N - The bug is an out-of-bounds read only; corrupted values are written into in-bounds emulator/vCPU register slots, with no host memory write or control-flow hijack primitive.\nA:H - The out-of-bounds host stack access can fault into unmapped memory and oops/panic the host kernel, so availability impact is scored High."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/kvm/emulate.c"
                    ],
                    "versions": [
                        {
                            "version": "b443183a25ab61840a12de92f8822849e017b9c8",
                            "lessThan": "a7ebfbea0f52550d7cdf12c38f3f5eaa7b2b6494",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b443183a25ab61840a12de92f8822849e017b9c8",
                            "lessThan": "696db303e54f7352623d9f640e6c51d8fa9d5588",
                            "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/emulate.c"
                    ],
                    "versions": [
                        {
                            "version": "6.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.0.8",
                            "lessThanOrEqual": "6.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1",
                            "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": "6.0",
                                    "versionEndExcluding": "6.0.8"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.0",
                                    "versionEndExcluding": "6.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/a7ebfbea0f52550d7cdf12c38f3f5eaa7b2b6494"
                },
                {
                    "url": "https://git.kernel.org/stable/c/696db303e54f7352623d9f640e6c51d8fa9d5588"
                }
            ],
            "title": "KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}