{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-52936",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.370Z",
        "datePublished": "2026-06-24T07:14:26.649Z",
        "dateUpdated": "2026-06-24T07:14:26.649Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-24T07:14:26.649Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: jitterentropy - replace long-held spinlock with mutex\n\njent_kcapi_random() serializes the shared jitterentropy state, but it\ncurrently holds a spinlock across the jent_read_entropy() call. That\npath performs expensive jitter collection and SHA3 conditioning, so\nparallel readers can trigger stalls as contending waiters spin for\nthe same lock.\n\nTo prevent non-preemptible lock hold, replace rng->jent_lock with a\nmutex so contended readers sleep instead of spinning on a shared lock\nheld across expensive entropy generation."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "crypto/jitterentropy-kcapi.c"
                    ],
                    "versions": [
                        {
                            "version": "bb5530e4082446aac3a3d69780cd4dbfa4520013",
                            "lessThan": "18216b8ab6904753eaf31baf453cb02ecd202ba4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bb5530e4082446aac3a3d69780cd4dbfa4520013",
                            "lessThan": "4c03e6eb98443dc4d6d422a9780034a5b75376b4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bb5530e4082446aac3a3d69780cd4dbfa4520013",
                            "lessThan": "ff734dbd9e2432601a6dcd167cfb0bf8a36d1880",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bb5530e4082446aac3a3d69780cd4dbfa4520013",
                            "lessThan": "ec427dc5286da1ed08f2d510e2147a7581b0cb02",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bb5530e4082446aac3a3d69780cd4dbfa4520013",
                            "lessThan": "01d798e9feb30212952d4e992801ba6bd6a82351",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "crypto/jitterentropy-kcapi.c"
                    ],
                    "versions": [
                        {
                            "version": "4.2",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.2",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.141",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.91",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.33",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.10",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "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": "4.2",
                                    "versionEndExcluding": "6.6.141"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "6.12.91"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "6.18.33"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "7.0.10"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.2",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02"
                },
                {
                    "url": "https://git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351"
                }
            ],
            "title": "crypto: jitterentropy - replace long-held spinlock with mutex",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}