100 lines
4.9 KiB
JSON
100 lines
4.9 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-38017",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T04:51:23.977Z",
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"datePublished": "2025-06-18T09:28:25.790Z",
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"dateUpdated": "2026-05-11T21:19:42.321Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-11T21:19:42.321Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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]."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/eventpoll.c"
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],
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"versions": [
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{
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"version": "99a0ad16dfd114a429df665065dcc576dad743c0",
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"lessThan": "7631dca012593c95d36199082546a24a0058fc50",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0a65bc27bd645894175c059397b4916e31955fb2",
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"lessThan": "d9ec73301099ec5975505e1c3effbe768bab9490",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/eventpoll.c"
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],
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"versions": [
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{
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"version": "6.14.4",
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"lessThan": "6.14.8",
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"status": "affected",
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"versionType": "semver"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14.4",
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"versionEndExcluding": "6.14.8"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/7631dca012593c95d36199082546a24a0058fc50"
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},
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{
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"url": "https://git.kernel.org/stable/c/d9ec73301099ec5975505e1c3effbe768bab9490"
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}
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],
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"title": "fs/eventpoll: fix endless busy loop after timeout has expired",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |