{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "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": "2026-05-11T21:19:42.321Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T21:19:42.321Z"
            },
            "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"
            }
        }
    }
}