CVE-2025-39715

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The kernel and gateway\npage execute at privilege level 0, so this code never triggers\na read access interruption. Thus, it is currently possible for\nuser code to execute a LWS compare and swap operation at an\naddress that is read protected at privilege level 3 (PRIV_USER).\n\nFix this by probing read access rights at privilege level 3 and\nbranching to lws_fault if access isn't allowed."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/parisc/kernel/syscall.S"], "versions": [{"version": "d0585d742ff2d82accd26c661c60a6d260429c4a", "lessThan": "e8b496c52aa0c6572d88db7cab85aeea6f9c194d", "status": "affected", "versionType": "git"}, {"version": "d0585d742ff2d82accd26c661c60a6d260429c4a", "lessThan": "8bccf47adbf658293528e86960e6d6f736b1c9f7", "status": "affected", "versionType": "git"}, {"version": "d0585d742ff2d82accd26c661c60a6d260429c4a", "lessThan": "bc0a24c24ceebabb5ba65900e332233d79e625e6", "status": "affected", "versionType": "git"}, {"version": "d0585d742ff2d82accd26c661c60a6d260429c4a", "lessThan": "9b6af875baba9c4679b55f4561e201485451305f", "status": "affected", "versionType": "git"}, {"version": "d0585d742ff2d82accd26c661c60a6d260429c4a", "lessThan": "f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8", "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/parisc/kernel/syscall.S"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.149", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.103", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.44", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.4", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "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": "5.17", "versionEndExcluding": "6.1.149"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.16.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e8b496c52aa0c6572d88db7cab85aeea6f9c194d"}, {"url": "https://git.kernel.org/stable/c/8bccf47adbf658293528e86960e6d6f736b1c9f7"}, {"url": "https://git.kernel.org/stable/c/bc0a24c24ceebabb5ba65900e332233d79e625e6"}, {"url": "https://git.kernel.org/stable/c/9b6af875baba9c4679b55f4561e201485451305f"}, {"url": "https://git.kernel.org/stable/c/f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8"}], "title": "parisc: Revise gateway LWS calls to probe user read access", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:42:42.036Z"}}, {"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T12:06:32.491Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC CN 4100", "versions": [{"status": "affected", "version": "0", "lessThan": "V5.0", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}]}]}}

{}

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Because of the way read\naccess support is implemented, read access interruptions are only\ntriggered at privilege levels 2 and 3. The kernel and gateway\npage execute at privilege level 0, so this code never triggers\na read access interruption. Thus, it is currently possible for\nuser code to execute a LWS compare and swap operation at an\naddress that is read protected at privilege level 3 (PRIV_USER).\n\nFix this by probing read access rights at privilege level 3 and\nbranching to lws_fault if access isn't allowed."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nparisc: Revisar las llamadas LWS de puerta de enlace para sondear el acceso de lectura del usuario\n\nUtilizamos las instrucciones load y stbys,e para activar interrupciones de referencia de memoria sin escribir en la memoria. Debido a la forma en que se implementa el soporte de acceso de lectura, las interrupciones de acceso de lectura solo se activan en los niveles de privilegio 2 y 3. El kernel y la p\u00e1gina de puerta de enlace se ejecutan en el nivel de privilegio 0, por lo tanto, este c\u00f3digo nunca activa una interrupci\u00f3n de acceso de lectura. As\u00ed, actualmente es posible que el c\u00f3digo de usuario ejecute una operaci\u00f3n LWS de comparaci\u00f3n e intercambio en una direcci\u00f3n que est\u00e1 protegida contra lectura en el nivel de privilegio 3 (PRIV_USER).\n\nEsto se soluciona sondeando los derechos de acceso de lectura en el nivel de privilegio 3 y bifurcando a lws_fault si el acceso no est\u00e1 permitido."}], "id": "CVE-2025-39715", "lastModified": "2026-10-19T21:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-09-05T18:15:48.990", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8bccf47adbf658293528e86960e6d6f736b1c9f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9b6af875baba9c4679b55f4561e201485451305f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bc0a24c24ceebabb5ba65900e332233d79e625e6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8b496c52aa0c6572d88db7cab85aeea6f9c194d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: parisc: Revise gateway LWS calls to probe user read access", "id": "2393516", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393516"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39715", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39715\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39715\nhttps://lore.kernel.org/linux-cve-announce/2025090551-CVE-2025-39715-6248@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-06T09:01:30.710002+00:00", "updated": "2025-09-06T09:01:30.710107+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}