{"vulnerability": "CVE-2025-21655", "sightings": [{"uuid": "2bd96a14-6882-430f-817a-8c7858d865cd", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21655", "type": "seen", "source": "https://infosec.exchange/users/cve/statuses/113861018791594110", "content": "", "creation_timestamp": "2025-01-20T13:54:28.708679Z"}, {"uuid": "2bc277bf-7c99-43e5-b496-b3e5b099d1ab", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21655", "type": "seen", "source": "https://bsky.app/profile/cve-notifications.bsky.social/post/3lg6jmzuuxw27", "content": "", "creation_timestamp": "2025-01-20T14:15:54.965017Z"}, {"uuid": "2126c038-1b55-4ac4-8067-1ed6112dd38f", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21655", "type": "seen", "source": "https://bsky.app/profile/cve.skyfleet.blue/post/3lg6liqafqj2e", "content": "", "creation_timestamp": "2025-01-20T14:49:19.019130Z"}, {"uuid": "39d5f6b6-1f3a-4abc-a339-f77cd898461c", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21655", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/5084", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-21655\n\ud83d\udd25 CVSS Score: N/A\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/eventfd: ensure io_eventfd_signal() defers another RCU period\n\nio_eventfd_do_signal() is invoked from an RCU callback, but when\ndropping the reference to the io_ev_fd, it calls io_eventfd_free()\ndirectly if the refcount drops to zero. This isn't correct, as any\npotential freeing of the io_ev_fd should be deferred another RCU grace\nperiod.\n\nJust call io_eventfd_put() rather than open-code the dec-and-test and\nfree, which will correctly defer it another RCU grace period.\n\ud83d\udccf Published: 2025-01-20T13:48:40.544Z\n\ud83d\udccf Modified: 2025-02-23T07:15:02.767Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033\n2. https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10\n3. https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7\n4. https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb\n5. https://project-zero.issues.chromium.org/issues/388499293", "creation_timestamp": "2025-02-23T07:24:30.000000Z"}, {"uuid": "85ae6bba-f187-446a-8a8b-711f195c8989", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21655", "type": "seen", "source": "Telegram/ii7D4YkGNSBdngjp6vaBfuvBkg3IJ08nBGeA8s3WIFBiu-h2", "content": "", "creation_timestamp": "2025-02-23T17:38:05.000000Z"}, {"uuid": "9f350dc6-4a3d-4abf-a51c-cc89652d96d1", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21655", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/2359", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-21655\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/eventfd: ensure io_eventfd_signal() defers another RCU period\n\nio_eventfd_do_signal() is invoked from an RCU callback, but when\ndropping the reference to the io_ev_fd, it calls io_eventfd_free()\ndirectly if the refcount drops to zero. This isn't correct, as any\npotential freeing of the io_ev_fd should be deferred another RCU grace\nperiod.\n\nJust call io_eventfd_put() rather than open-code the dec-and-test and\nfree, which will correctly defer it another RCU grace period.\n\ud83d\udccf Published: 2025-01-20T13:48:40.544Z\n\ud83d\udccf Modified: 2025-01-20T13:48:40.544Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033\n2. https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10\n3. https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7\n4. https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb", "creation_timestamp": "2025-01-20T13:59:23.000000Z"}, {"uuid": "2fb82ca2-e88a-4c78-88de-f70219f3411b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21655", "type": "seen", "source": "https://t.me/cvedetector/15887", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2025-21655 - Linux Kernel io_uring EventFD RCU Refcount Vulnerability\", \n  \"Content\": \"CVE ID : CVE-2025-21655 \nPublished : Jan. 20, 2025, 2:15 p.m. | 31\u00a0minutes ago \nDescription : In the Linux kernel, the following vulnerability has been resolved:  \n  \nio_uring/eventfd: ensure io_eventfd_signal() defers another RCU period  \n  \nio_eventfd_do_signal() is invoked from an RCU callback, but when  \ndropping the reference to the io_ev_fd, it calls io_eventfd_free()  \ndirectly if the refcount drops to zero. This isn't correct, as any  \npotential freeing of the io_ev_fd should be deferred another RCU grace  \nperiod.  \n  \nJust call io_eventfd_put() rather than open-code the dec-and-test and  \nfree, which will correctly defer it another RCU grace period. \nSeverity: 0.0 | NA \nVisit the link for more details, such as CVSS details, affected products, timeline, and more...\",\n  \"Detection Date\": \"20 Jan 2025\",\n  \"Type\": \"Vulnerability\"\n}\n\ud83d\udd39 t.me/cvedetector \ud83d\udd39", "creation_timestamp": "2025-01-20T15:52:49.000000Z"}, {"uuid": "d3840cb0-b64f-4817-9d18-1c20e213e5fc", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21655", "type": "published-proof-of-concept", "source": "Telegram/nHS0XScXforDrXl5voBaqPDObiEW1keH88ZzbYw4M7lx_JM", "content": "", "creation_timestamp": "2025-02-22T08:00:05.000000Z"}]}