{"vulnerability": "CVE-2025-21640", "sightings": [{"uuid": "b7113ff2-ea87-4adf-bf31-7a03e81d9cce", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21640", "type": "seen", "source": "https://infosec.exchange/users/cve/statuses/113854659059377333", "content": "", "creation_timestamp": "2025-01-19T10:57:07.097188Z"}, {"uuid": "d1514686-f7a3-4f1e-b11f-7fd82e3d9e82", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21640", "type": "seen", "source": "https://bsky.app/profile/cve-notifications.bsky.social/post/3lg3p3wyztq2j", "content": "", "creation_timestamp": "2025-01-19T11:15:44.769046Z"}, {"uuid": "3b6e250a-17f7-425f-8b6b-e1131c5c1509", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21640", "type": "seen", "source": "https://bsky.app/profile/cve.skyfleet.blue/post/3lg3qyyiago2h", "content": "", "creation_timestamp": "2025-01-19T11:49:54.966970Z"}, {"uuid": "c2a6a7b6-a298-4596-a871-23d4071c8c5f", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21640", "type": "seen", "source": "https://t.me/DarkWebInformer_CVEAlerts/2325", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-21640\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: cookie_hmac_alg: 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, as this is the only\nmember needed from the 'net' structure, but that would increase the size\nof this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is\nused.\n\ud83d\udccf Published: 2025-01-19T10:17:57.593Z\n\ud83d\udccf Modified: 2025-01-19T10:17:57.593Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71\n2. https://git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5\n3. https://git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0b\n4. https://git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4", "creation_timestamp": "2025-01-19T10:58:32.000000Z"}, {"uuid": "4d71aa14-cdf1-422f-95e4-f1f6b1d3a65a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-21640", "type": "seen", "source": "https://t.me/cvedetector/15832", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2025-21640 - Apache Linux Kernel SCTP Null Pointer Dereference Vulnerability\", \n  \"Content\": \"CVE ID : CVE-2025-21640 \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: cookie_hmac_alg: 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, as this is the only  \nmember needed from the 'net' structure, but that would increase the size  \nof this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is  \nused. \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": "2025-01-19T13:07:19.000000Z"}]}