{"id":"CVE-2025-40187","title":"net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()\n\nIf new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0\nand sctp_ulpevent_make_au…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 1014b83778c8677f1d7a57c26dc728baa801ac62","Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 7f702f85df0266ed7b5bab81ba50394c92f3c928","Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < dbceedc0213e75bf3e9f9f9e2f66b10699d004fe","Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 025419f4e216a3ae0d0cec622262e98e8078c447","Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < c21f45cfa4a9526b34d76b397c9ef080668b6e73","Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < d0e8f1445c19b1786759ba72a38267e1449bab7e","Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < badbd79313e6591616c1b78e29a9b71efed7f035","Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 2f3119686ef50319490ccaec81a575973da98815","Linux 4.17"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-15T21:57:50.354384Z"},"published":"2025-11-12","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:02:40.120Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40187","references":[{"url":"https://git.kernel.org/stable/c/1014b83778c8677f1d7a57c26dc728baa801ac62"},{"url":"https://git.kernel.org/stable/c/7f702f85df0266ed7b5bab81ba50394c92f3c928"},{"url":"https://git.kernel.org/stable/c/dbceedc0213e75bf3e9f9f9e2f66b10699d004fe"},{"url":"https://git.kernel.org/stable/c/025419f4e216a3ae0d0cec622262e98e8078c447"},{"url":"https://git.kernel.org/stable/c/c21f45cfa4a9526b34d76b397c9ef080668b6e73"},{"url":"https://git.kernel.org/stable/c/d0e8f1445c19b1786759ba72a38267e1449bab7e"},{"url":"https://git.kernel.org/stable/c/badbd79313e6591616c1b78e29a9b71efed7f035"},{"url":"https://git.kernel.org/stable/c/2f3119686ef50319490ccaec81a575973da98815"}],"tags":["cve.org"],"epss":0.00638,"epssPercentile":0.49377,"ingestedAt":"2026-10-15T22:48:25.550Z","slug":"CVE-2025-40187","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()\n\nIf new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0\nand sctp_ulpevent_make_authkey() returns 0, then the variable\nai_ev remains zero and the zero will be dereferenced\nin the sctp_ulpevent_free() function.\n\n## Affected\n\n- `Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 1014b83778c8677f1d7a57c26dc728baa801ac62`\n- `Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 7f702f85df0266ed7b5bab81ba50394c92f3c928`\n- `Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < dbceedc0213e75bf3e9f9f9e2f66b10699d004fe`\n- `Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 025419f4e216a3ae0d0cec622262e98e8078c447`\n- `Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < c21f45cfa4a9526b34d76b397c9ef080668b6e73`\n- `Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < d0e8f1445c19b1786759ba72a38267e1449bab7e`\n- `Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < badbd79313e6591616c1b78e29a9b71efed7f035`\n- `Linux >= 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b < 2f3119686ef50319490ccaec81a575973da98815`\n- `Linux 4.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}