{"vulnerability": "CVE-2025-21638", "sightings": [{"uuid": "98d94b51-24d2-499a-a32e-7f24dee915f0", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21638", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/2327", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-21638\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: auth_enable: avoid using current->nsproxy\n\nAs mentioned in a previous commit of this series, using the 'net'\nstructure via 'current' is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader's/writer's netns vs only\n  from the opener's netns.\n\n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n  syzbot [1] using acct(2).\n\nThe 'net' structure can be obtained from the table->data using\ncontainer_of().\n\nNote that table->data could also be used directly, but that would\nincrease the size of this fix, while 'sctp.ctl_sock' still needs to be\nretrieved from 'net' structure.\n\ud83d\udccf Published: 2025-01-19T10:17:56.084Z\n\ud83d\udccf Modified: 2025-01-19T10:17:56.084Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3\n2. https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6\n3. https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36\n4. https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695", "creation_timestamp": "2025-01-19T10:58:33.000000Z"}, {"uuid": "8379f2aa-0bb5-47ae-98e9-65df907d088e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21638", "type": "seen", "source": "https://t.me/cvedetector/15831", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2025-21638 - Linux SCTP sysctl auth enables NULL Pointer Dereference\", \n  \"Content\": \"CVE ID : CVE-2025-21638 \nPublished : Jan. 19, 2025, 11:15 a.m. | 35\u00a0minutes ago \nDescription : In the Linux kernel, the following vulnerability has been resolved:  \n  \nsctp: sysctl: auth_enable: avoid using current->nsproxy  \n  \nAs mentioned in a previous commit of this series, using the 'net'  \nstructure via 'current' is not recommended for different reasons:  \n  \n- Inconsistency: getting info from the reader's/writer's netns vs only  \n  from the opener's netns.  \n  \n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'  \n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by  \n  syzbot [1] using acct(2).  \n  \nThe 'net' structure can be obtained from the table->data using  \ncontainer_of().  \n  \nNote that table->data could also be used directly, but that would  \nincrease the size of this fix, while 'sctp.ctl_sock' still needs to be  \nretrieved from 'net' structure. \nSeverity: 0.0 | NA \nVisit the link for more details, such as CVSS details, affected products, timeline, and more...\",\n  \"Detection Date\": \"19 Jan 2025\",\n  \"Type\": \"Vulnerability\"\n}\n\ud83d\udd39 t.me/cvedetector \ud83d\udd39", "creation_timestamp": "2025-01-19T13:07:15.000000Z"}, {"uuid": "6f24eb91-f153-47c0-96b2-bcb21ed5ce66", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21638", "type": "seen", "source": "https://infosec.exchange/users/cve/statuses/113854600041661024", "content": "", "creation_timestamp": "2025-01-19T10:42:06.370674Z"}, {"uuid": "a154745c-0e58-4e9c-a5d2-5d91072a18bc", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21638", "type": "seen", "source": "https://bsky.app/profile/cve-notifications.bsky.social/post/3lg3p3rogtk2f", "content": "", "creation_timestamp": "2025-01-19T11:15:39.146943Z"}, {"uuid": "cc407b34-2fb1-4176-971a-d419402be60b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21638", "type": "seen", "source": "https://bsky.app/profile/cve.skyfleet.blue/post/3lg3qyz2ncg2h", "content": "", "creation_timestamp": "2025-01-19T11:49:56.741836Z"}]}