{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-38017", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.977Z", "datePublished": "2025-06-18T09:28:25.790Z", "dateUpdated": "2025-06-18T09:28:25.790Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-06-18T09:28:25.790Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/eventpoll: fix endless busy loop after timeout has expired\n\nAfter commit 0a65bc27bd64 (\"eventpoll: Set epoll timeout if it's in\nthe future\"), the following program would immediately enter a busy\nloop in the kernel:\n\n```\nint main() {\n int e = epoll_create1(0);\n struct epoll_event event = {.events = EPOLLIN};\n epoll_ctl(e, EPOLL_CTL_ADD, 0, &event);\n const struct timespec timeout = {.tv_nsec = 1};\n epoll_pwait2(e, &event, 1, &timeout, 0);\n}\n```\n\nThis happens because the given (non-zero) timeout of 1 nanosecond\nusually expires before ep_poll() is entered and then\nep_schedule_timeout() returns false, but `timed_out` is never set\nbecause the code line that sets it is skipped. This quickly turns\ninto a soft lockup, RCU stalls and deadlocks, inflicting severe\nheadaches to the whole system.\n\nWhen the timeout has expired, we don't need to schedule a hrtimer, but\nwe should set the `timed_out` variable. Therefore, I suggest moving\nthe ep_schedule_timeout() check into the `timed_out` expression\ninstead of skipping it.\n\nbrauner: Note that there was an earlier fix by Joe Damato in response to\nmy bug report in [1]."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/eventpoll.c"], "versions": [{"version": "99a0ad16dfd114a429df665065dcc576dad743c0", "lessThan": "7631dca012593c95d36199082546a24a0058fc50", "status": "affected", "versionType": "git"}, {"version": "0a65bc27bd645894175c059397b4916e31955fb2", "lessThan": "d9ec73301099ec5975505e1c3effbe768bab9490", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/eventpoll.c"], "versions": [{"version": "6.14.4", "lessThan": "6.14.8", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14.4", "versionEndExcluding": "6.14.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7631dca012593c95d36199082546a24a0058fc50"}, {"url": "https://git.kernel.org/stable/c/d9ec73301099ec5975505e1c3effbe768bab9490"}], "title": "fs/eventpoll: fix endless busy loop after timeout has expired", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "73E279AE-4280-48EB-9798-AD37FE6F3D9D", "versionEndExcluding": "6.14.8", "versionStartIncluding": "6.14.4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*", "matchCriteriaId": "13FC0DDE-E513-465E-9E81-515702D49B74", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*", "matchCriteriaId": "8C7B5B0E-4EEB-48F5-B4CF-0935A7633845", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*", "matchCriteriaId": "2D240580-3048-49B2-9E27-F115A9DF8224", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc6:*:*:*:*:*:*", "matchCriteriaId": "90320558-E553-4EF5-8A0B-0F5D20113BD2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/eventpoll: fix endless busy loop after timeout has expired\n\nAfter commit 0a65bc27bd64 (\"eventpoll: Set epoll timeout if it's in\nthe future\"), the following program would immediately enter a busy\nloop in the kernel:\n\n```\nint main() {\n int e = epoll_create1(0);\n struct epoll_event event = {.events = EPOLLIN};\n epoll_ctl(e, EPOLL_CTL_ADD, 0, &event);\n const struct timespec timeout = {.tv_nsec = 1};\n epoll_pwait2(e, &event, 1, &timeout, 0);\n}\n```\n\nThis happens because the given (non-zero) timeout of 1 nanosecond\nusually expires before ep_poll() is entered and then\nep_schedule_timeout() returns false, but `timed_out` is never set\nbecause the code line that sets it is skipped. This quickly turns\ninto a soft lockup, RCU stalls and deadlocks, inflicting severe\nheadaches to the whole system.\n\nWhen the timeout has expired, we don't need to schedule a hrtimer, but\nwe should set the `timed_out` variable. Therefore, I suggest moving\nthe ep_schedule_timeout() check into the `timed_out` expression\ninstead of skipping it.\n\nbrauner: Note that there was an earlier fix by Joe Damato in response to\nmy bug report in [1]."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/eventpoll: corrige un bucle ocupado sin fin despu\u00e9s de que expira el tiempo de espera Despu\u00e9s de el commit 0a65bc27bd64 (\"eventpoll: establece el tiempo de espera de epoll si es en el futuro\"), el siguiente programa ingresar\u00eda inmediatamente en un bucle ocupado en el kernel: ``` int main() { int e = epoll_create1(0); struct epoll_event event = {.events = EPOLLIN}; epoll_ctl(e, EPOLL_CTL_ADD, 0, &event); const struct timespec timeout = {.tv_nsec = 1}; epoll_pwait2(e, &event, 1, &timeout, 0); } ``` Esto sucede porque el tiempo de espera dado (distinto de cero) de 1 nanosegundo generalmente expira antes de que se ingrese ep_poll() y luego ep_schedule_timeout() devuelve falso, pero `timed_out` nunca se establece porque se omite la l\u00ednea de c\u00f3digo que lo establece. Esto r\u00e1pidamente se convierte en un bloqueo suave, RCU se bloquea y se bloquea, lo que inflige graves dolores de cabeza a todo el sistema. Cuando el tiempo de espera ha expirado, no necesitamos programar un hrtimer, pero debemos establecer la variable `timed_out`. Por lo tanto, sugiero mover la comprobaci\u00f3n de ep_schedule_timeout() a la expresi\u00f3n `timed_out` en lugar de omitirla. brauner: Tenga en cuenta que hubo una correcci\u00f3n anterior por Joe Damato en respuesta a mi informe de error en [1]."}], "id": "CVE-2025-38017", "lastModified": "2025-11-14T19:01:41.973", "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": "2025-06-18T10:15:33.310", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7631dca012593c95d36199082546a24a0058fc50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d9ec73301099ec5975505e1c3effbe768bab9490"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fs/eventpoll: fix endless busy loop after timeout has expired", "id": "2373374", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373374"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\nfs/eventpoll: fix endless busy loop after timeout has expired\nAfter commit 0a65bc27bd64 (\"eventpoll: Set epoll timeout if it's in\nthe future\"), the following program would immediately enter a busy\nloop in the kernel:\n```\nint main() {\nint e = epoll_create1(0);\nstruct epoll_event event = {.events = EPOLLIN};\nepoll_ctl(e, EPOLL_CTL_ADD, 0, &event);\nconst struct timespec timeout = {.tv_nsec = 1};\nepoll_pwait2(e, &event, 1, &timeout, 0);\n}\n```\nThis happens because the given (non-zero) timeout of 1 nanosecond\nusually expires before ep_poll() is entered and then\nep_schedule_timeout() returns false, but `timed_out` is never set\nbecause the code line that sets it is skipped. This quickly turns\ninto a soft lockup, RCU stalls and deadlocks, inflicting severe\nheadaches to the whole system.\nWhen the timeout has expired, we don't need to schedule a hrtimer, but\nwe should set the `timed_out` variable. Therefore, I suggest moving\nthe ep_schedule_timeout() check into the `timed_out` expression\ninstead of skipping it.\nbrauner: Note that there was an earlier fix by Joe Damato in response to\nmy bug report in [1]."], "name": "CVE-2025-38017", "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38017\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38017\nhttps://lore.kernel.org/linux-cve-announce/2025061844-CVE-2025-38017-16a2@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:53:47.659734+00:00", "updated": "2025-06-23T08:53:47.659793+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}