{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-71155",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-01-13T15:30:19.663Z",
        "datePublished": "2026-01-23T14:25:54.663Z",
        "dateUpdated": "2026-08-05T12:12:23.055Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:12:23.055Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix gmap_helper_zap_one_page() again\n\nA few checks were missing in gmap_helper_zap_one_page(), which can lead\nto memory corruption in the guest under specific circumstances.\n\nAdd the missing checks."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - An unprivileged process inside an s390 KVM guest can drive the vulnerable path through ordinary page allocation and freeing, which invokes ESSA and reaches handle_essa(), __gmap_zap(), and gmap_helper_zap_one_page().\nAC:L - The attacker can use concurrent memory churn across vCPUs to control the relevant page-state transitions and can induce host backing-memory pressure by touching guest RAM, making repeated race attempts practical.\nPR:L - Although ESSA is privileged, unprivileged guest activity invokes it indirectly through arch_alloc_page() and arch_free_page() without requiring guest administrative capabilities.\nUI:N - Exploitation requires no action by another user once the attacker runs the memory-churning workload.\nS:U - The corruption affects memory within the same guest security authority and does not provide a demonstrated guest-to-host or cross-VM escape.\nC:H - Incorrectly discarding a stable swapped guest page can corrupt attacker-groomed guest kernel memory; successful exploitation could yield guest-kernel execution and unrestricted access to guest secrets.\nI:H - The flaw can replace preserved guest-page contents with a newly faulted page, enabling whole-page corruption of sensitive data or control structures and potentially guest-kernel code execution.\nA:H - Corruption of arbitrary guest data, page tables, or kernel control structures can panic, hang, or otherwise render the guest unavailable."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/s390/mm/gmap_helpers.c"
                    ],
                    "versions": [
                        {
                            "version": "5deafa27d9ae040b75d392f60b12e300b42b4792",
                            "lessThan": "2af2abbcbf8573100288e8f8aea2dab8a2a0ceb7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5deafa27d9ae040b75d392f60b12e300b42b4792",
                            "lessThan": "2f393c228cc519ddf19b8c6c05bf15723241aa96",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "919efcadb63fc3d3a82c3de7194140e0b28903dc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.17.4",
                            "lessThan": "6.18",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/s390/mm/gmap_helpers.c"
                    ],
                    "versions": [
                        {
                            "version": "6.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.4",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19",
                            "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": "6.18",
                                    "versionEndExcluding": "6.18.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "6.19"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.17.4"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/2af2abbcbf8573100288e8f8aea2dab8a2a0ceb7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2f393c228cc519ddf19b8c6c05bf15723241aa96"
                }
            ],
            "title": "KVM: s390: Fix gmap_helper_zap_one_page() again",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}