{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-38488", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.021Z", "datePublished": "2025-07-28T11:21:52.085Z", "dateUpdated": "2026-05-11T21:28:58.976Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:28:58.976Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-after-free in crypt_message when using async crypto\n\nThe CVE-2024-50047 fix removed asynchronous crypto handling from\ncrypt_message(), assuming all crypto operations are synchronous.\nHowever, when hardware crypto accelerators are used, this can cause\nuse-after-free crashes:\n\n crypt_message()\n // Allocate the creq buffer containing the req\n creq = smb2_get_aead_req(..., &req);\n\n // Async encryption returns -EINPROGRESS immediately\n rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);\n\n // Free creq while async operation is still in progress\n kvfree_sensitive(creq, ...);\n\nHardware crypto modules often implement async AEAD operations for\nperformance. 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When crypto_aead_encrypt/decrypt() returns -EINPROGRESS,\nthe operation completes asynchronously. Without crypto_wait_req(),\nthe function immediately frees the request buffer, leading to crashes\nwhen the driver later accesses the freed memory.\n\nThis results in a use-after-free condition when the hardware crypto\ndriver later accesses the freed request structure, leading to kernel\ncrashes with NULL pointer dereferences.\n\nThe issue occurs because crypto_alloc_aead() with mask=0 doesn't\nguarantee synchronous operation. Even without CRYPTO_ALG_ASYNC in\nthe mask, async implementations can be selected.\n\nFix by restoring the async crypto handling:\n- DECLARE_CRYPTO_WAIT(wait) for completion tracking\n- aead_request_set_callback() for async completion notification\n- crypto_wait_req() to wait for operation completion\n\nThis ensures the request buffer isn't freed until the crypto operation\ncompletes, whether synchronous or asynchronous, while preserving the\nCVE-2024-50047 fix."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: smb: cliente: correcci\u00f3n del use-after-free en crypt_message al usar criptograf\u00eda as\u00edncrona. La correcci\u00f3n CVE-2024-50047 elimin\u00f3 el manejo de criptograf\u00eda as\u00edncrona de crypt_message(), asumiendo que todas las operaciones de criptograf\u00eda son s\u00edncronas. Sin embargo, cuando se usan aceleradores de criptograf\u00eda de hardware, esto puede causar fallos de use-after-free: crypt_message() // Asignar el b\u00fafer creq que contiene la solicitud creq = smb2_get_aead_req(..., &req); // El cifrado as\u00edncrono devuelve -EINPROGRESS inmediatamente rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req); // Liberar creq mientras la operaci\u00f3n as\u00edncrona a\u00fan est\u00e1 en progreso kvfree_sensitive(creq, ...); Los m\u00f3dulos de criptograf\u00eda de hardware a menudo implementan operaciones AEAD as\u00edncronas para mejorar el rendimiento. Cuando crypto_aead_encrypt/decrypt() devuelve -EINPROGRESS, la operaci\u00f3n se completa de forma as\u00edncrona. Sin crypto_wait_req(), la funci\u00f3n libera inmediatamente el b\u00fafer de solicitud, lo que provoca fallos cuando el controlador accede posteriormente a la memoria liberada. Esto genera una condici\u00f3n de use-after-free cuando el controlador de cifrado de hardware accede posteriormente a la estructura de solicitud liberada, lo que provoca fallos del kernel con desreferencias de punteros NULL. El problema se produce porque crypto_alloc_aead() con mask=0 no garantiza la operaci\u00f3n s\u00edncrona. Incluso sin CRYPTO_ALG_ASYNC en la m\u00e1scara, se pueden seleccionar implementaciones as\u00edncronas. Soluci\u00f3n restaurando el manejo de criptograf\u00eda as\u00edncrona: - DECLARE_CRYPTO_WAIT(wait) para seguimiento de finalizaci\u00f3n - aead_request_set_callback() para notificaci\u00f3n de finalizaci\u00f3n as\u00edncrona - crypto_wait_req() para esperar a que se complete la operaci\u00f3n Esto garantiza que el b\u00fafer de solicitud no se libere hasta que se complete la operaci\u00f3n de criptograf\u00eda, ya sea sincr\u00f3nica o asincr\u00f3nica, al tiempo que se conserva la correcci\u00f3n CVE-2024-50047."}], "id": "CVE-2025-38488", "lastModified": "2026-01-07T16:26:11.300", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-28T12:15:30.857", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/15a0a5de49507062bc3be4014a403d8cea5533de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2a76bc2b24ed889a689fb1c9015307bf16aafb5b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d047b12f86cc3b9fde1171c02d9bccf4dba0632"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6550b2bef095d0dd2d2c8390d2ea4c3837028833"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ac90f6824fc44d2e55a82503ddfc95defb19ae0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a1d3e8d40f151c2d5a5f40c410e6e433f62f438"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b220bed63330c0e1733dc06ea8e75d5b9962b6b6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: smb: client: fix use-after-free in crypt_message when using async crypto", "id": "2383894", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383894"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-38488", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38488\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38488\nhttps://lore.kernel.org/linux-cve-announce/2025072816-CVE-2025-38488-7f36@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-29T07:59:24.139368+00:00", "updated": "2025-07-29T07:59:24.139447+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}