{"uuid": "c2a6a7b6-a298-4596-a871-23d4071c8c5f", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "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"}