{"id":"CVE-2026-74634","summary":"ring-buffer: Prevent subbuf order change when resizing is disabled","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Prevent subbuf order change when resizing is disabled\n\nBecause ring_buffer_subbuf_order_set() frees buffer pages, we can't\nallow it when resizing is disabled. A non-consuming reader is at risk of\nuse-after-free (rb_advance_iter()).\n\nReturn -EBUSY on resize_disabled, matching ring_buffer_resize()\nbehaviour.","modified":"2026-08-27T11:30:40.850845879Z","published":"2026-08-22T15:32:14.547Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74634.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74634.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74634"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f9b94daa542a8d2532f0930f01cd9aec2d19621b"},{"fixed":"b45b91db41379ee5fb36c187d6d7c37b725cbe8e"},{"fixed":"62978cf6347972c04130e4e841ba404504d92b32"},{"fixed":"7568e9e717e7540bd05bcc007f5d76fcaff3cdff"},{"fixed":"bf98d7b0d5a99991e47e66cee4eb1d3fa514be97"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74634.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.8.0"},{"fixed":"6.12.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74634.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}