CVE-2025-71295

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This\ncauses try_to_free_buffers() to call drop_buffers() on a folio with no\nbuffers, leading to a null pointer dereference.\n\nAdding a check in try_to_free_buffers() to return early if the folio has no\nbuffers attached, with WARN_ON_ONCE() to alert about the misconfiguration.\nThis provides defensive hardening."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/buffer.c"], "versions": [{"version": "d0eafc763135508be118dac208887a26c0adb74d", "lessThan": "1b111a69a6e33a922622bf9870e4e63fb2b649c8", "status": "affected", "versionType": "git"}, {"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376", "lessThan": "c1b6227555c52781178132b7a06466711855795c", "status": "affected", "versionType": "git"}, {"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376", "lessThan": "727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3", "status": "affected", "versionType": "git"}, {"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376", "lessThan": "42c32d7571ccd8ef32351cac506f00b0fae99fd2", "status": "affected", "versionType": "git"}, {"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376", "lessThan": "c6246ca15999053d2632fbcc7b86e6eef7f077cb", "status": "affected", "versionType": "git"}, {"version": "b4fa966f03b7401ceacd4ffd7227197afb2b8376", "lessThan": "b68f91ef3b3fe82ad78c417de71b675699a8467c", "status": "affected", "versionType": "git"}, {"version": "6.1.72", "lessThan": "6.1.165", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/buffer.c"], "versions": [{"version": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "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": "6.1.72", "versionEndExcluding": "6.1.165"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.128"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.19.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1b111a69a6e33a922622bf9870e4e63fb2b649c8"}, {"url": "https://git.kernel.org/stable/c/c1b6227555c52781178132b7a06466711855795c"}, {"url": "https://git.kernel.org/stable/c/727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3"}, {"url": "https://git.kernel.org/stable/c/42c32d7571ccd8ef32351cac506f00b0fae99fd2"}, {"url": "https://git.kernel.org/stable/c/c6246ca15999053d2632fbcc7b86e6eef7f077cb"}, {"url": "https://git.kernel.org/stable/c/b68f91ef3b3fe82ad78c417de71b675699a8467c"}], "title": "fs/buffer: add alert in try_to_free_buffers() for folios without buffers", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-71295", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T21:16:40.207679Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-05T21:23:11.993Z"}}]}}

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This\ncauses try_to_free_buffers() to call drop_buffers() on a folio with no\nbuffers, leading to a null pointer dereference.\n\nAdding a check in try_to_free_buffers() to return early if the folio has no\nbuffers attached, with WARN_ON_ONCE() to alert about the misconfiguration.\nThis provides defensive hardening."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.165", "versionStartIncluding": "6.1.72"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.128", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.75", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "6.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T16:03:35.695Z"}}}, "cveMetadata": {"cveId": "CVE-2025-71295", "state": "PUBLISHED", "dateUpdated": "2026-11-05T21:23:11.993Z", "dateReserved": "2026-05-06T11:31:45.510Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-06T11:32:25.917Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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This\ncauses try_to_free_buffers() to call drop_buffers() on a folio with no\nbuffers, leading to a null pointer dereference.\n\nAdding a check in try_to_free_buffers() to return early if the folio has no\nbuffers attached, with WARN_ON_ONCE() to alert about the misconfiguration.\nThis provides defensive hardening."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs/buffer: a\u00f1adir alerta en try_to_free_buffers() para folios sin b\u00faferes\n\ntry_to_free_buffers() puede ser llamada en folios sin b\u00faferes adjuntos cuando filemap_release_folio() es invocada en un folio perteneciente a un mapeo con AS_RELEASE_ALWAYS establecido pero sin operaci\u00f3n release_folio definida.\n\nEn tales casos, folio_needs_release() devuelve verdadero debido a la bandera AS_RELEASE_ALWAYS, pero el folio no tiene datos de b\u00fafer privados. Esto causa que try_to_free_buffers() llame a drop_buffers() en un folio sin b\u00faferes, lo que lleva a una desreferencia de puntero nulo.\n\nA\u00f1adiendo una comprobaci\u00f3n en try_to_free_buffers() para retornar anticipadamente si el folio no tiene b\u00faferes adjuntos, con WARN_ON_ONCE() para alertar sobre la mala configuraci\u00f3n. Esto proporciona un endurecimiento defensivo."}], "id": "CVE-2025-71295", "lastModified": "2026-11-05T22:17:40.543", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-71295", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:16:40.207679Z", "version": "2.0.3"}}]}, "published": "2026-05-06T12:16:28.820", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1b111a69a6e33a922622bf9870e4e63fb2b649c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/42c32d7571ccd8ef32351cac506f00b0fae99fd2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b68f91ef3b3fe82ad78c417de71b675699a8467c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c1b6227555c52781178132b7a06466711855795c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6246ca15999053d2632fbcc7b86e6eef7f077cb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fs/buffer: add alert in try_to_free_buffers() for folios without buffers", "id": "2467107", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467107"}, "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"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel. This vulnerability occurs when the try_to_free_buffers() function is called on memory pages (folios) that do not have associated data buffers, specifically when certain conditions related to memory release operations are met. This can lead to a null pointer dereference, which may cause the system to crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2025-71295", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-71295\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-71295\nhttps://lore.kernel.org/linux-cve-announce/2026050633-CVE-2025-71295-621a@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,1b111a69a6e33a922622bf9870e4e63fb2b649c8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,c1b6227555c52781178132b7a06466711855795c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,42c32d7571ccd8ef32351cac506f00b0fae99fd2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,c6246ca15999053d2632fbcc7b86e6eef7f077cb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b68f91ef3b3fe82ad78c417de71b675699a8467c)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.165,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.128,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.75,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.16,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-06T14:30:05.883518+00:00", "updated": "2026-05-07T02:00:18.561013+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}