{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31553",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.115Z",
        "datePublished": "2026-04-24T14:35:37.828Z",
        "dateUpdated": "2026-08-05T12:23:27.579Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:23:27.579Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()\n\nUsing \"(u64 __user *)hva + offset\" to get the virtual addresses of S1/S2\ndescriptors looks really wrong, if offset is not zero. What we want to get\nfor swapping is hva + offset, not hva + offset*8. ;-)\n\nFix it."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable path is reached by local execution of a KVM vCPU that traps arm64 AT instructions through KVM_RUN. It is not reachable by network packets or physical input.\nAC:L - The attacker can control the guest/nested page-table layout, enable hardware Access Flag management, choose a nonzero descriptor offset, and execute the trapping AT instruction. No race or external condition is required.\nPR:L - Exploitation requires control of guest or VM execution state, such as a tenant/guest operator able to run a nested-virtualization-capable VM, but not host administrator privileges. Given uncertainty, this is scored as low rather than high privilege.\nUI:N - No victim action is required once the attacker can run the malicious guest code. The trigger is a direct guest instruction/emulation path.\nS:C - This is a KVM guest-triggered bug in host-side emulation, so a plausible exploit crosses the VM isolation boundary. Corruption can affect memory in the host VMM/VM backing context rather than only the guest instruction stream.\nC:H - The incorrect pointer arithmetic creates guest-controlled memory corruption in the host userspace address used for VM memory, which can be leveraged as part of a VM escape. Per the overestimation rule, this is treated as high confidentiality impact.\nI:H - The CAS targets the wrong address and can write an attacker-influenced descriptor value outside the intended page-table entry. This is a memory corruption primitive with plausible control-flow or data integrity consequences in the VMM/VM boundary context.\nA:H - Repeated triggering can corrupt translation descriptors or adjacent VM/VMM memory and can reliably break guest execution or the VMM handling path. Kernel/KVM memory-corruption paths are scored as 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/kvm/at.c"
                    ],
                    "versions": [
                        {
                            "version": "f6927b41d57390c597a126063e2e518911976878",
                            "lessThan": "4307e05e568782fc92eff651b09ee5dee88a058d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f6927b41d57390c597a126063e2e518911976878",
                            "lessThan": "0496acc42fb51eee040b5170cec05cec41385540",
                            "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/kvm/at.c"
                    ],
                    "versions": [
                        {
                            "version": "6.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.11",
                            "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": "6.19",
                                    "versionEndExcluding": "6.19.11"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.19",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/4307e05e568782fc92eff651b09ee5dee88a058d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0496acc42fb51eee040b5170cec05cec41385540"
                }
            ],
            "title": "KVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}