{"id":"CVE-2025-21635","title":"rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nrds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy\n\nAs mentioned in a previous commit of this series, using the 'net'\nstructure via 'current' is not recomm…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"adp","vendor":"Linux","product":"Linux","affected":["Linux >= c6a58ffed53612be86b758df1cdb0b0f4305e9cb < 33b3e09a489a31b30342b77cc55290f025d95c7e","Linux >= c6a58ffed53612be86b758df1cdb0b0f4305e9cb < de8d6de0ee27be4b2b1e5b06f04aeacbabbba492","Linux >= c6a58ffed53612be86b758df1cdb0b0f4305e9cb < 7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c","Linux 4.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2025-10-01T19:54:16.928023Z"},"published":"2025-01-19","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:35:52.172Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21635","references":[{"url":"https://git.kernel.org/stable/c/33b3e09a489a31b30342b77cc55290f025d95c7e"},{"url":"https://git.kernel.org/stable/c/de8d6de0ee27be4b2b1e5b06f04aeacbabbba492"},{"url":"https://git.kernel.org/stable/c/7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c"}],"tags":["cve.org"],"epss":0.00254,"epssPercentile":0.16799,"ingestedAt":"2026-10-21T12:48:53.721Z","slug":"CVE-2025-21635","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nrds: sysctl: rds_tcp_{rcv,snd}buf: 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 per-netns structure can be obtained from the table->data using\ncontainer_of(), then the 'net' one can be retrieved from the listen\nsocket (if available).\n\n## Affected\n\n- `Linux >= c6a58ffed53612be86b758df1cdb0b0f4305e9cb < 33b3e09a489a31b30342b77cc55290f025d95c7e`\n- `Linux >= c6a58ffed53612be86b758df1cdb0b0f4305e9cb < de8d6de0ee27be4b2b1e5b06f04aeacbabbba492`\n- `Linux >= c6a58ffed53612be86b758df1cdb0b0f4305e9cb < 7f5611cbc4871c7fb1ad36c2e5a9edad63dca95c`\n- `Linux 4.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}