{"id":"CVE-2026-89503","summary":"ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()\n\nring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set,\nit can allocate a reader page with an outdated order. This isn't a big\nissue, the user can still re-allocate a new reader page and try again.\n\nHowever, what is more problematic is if the value of subbuf_order\nchanges in the middle of ring_buffer_alloc_read_page(). In that case,\nbpage-\u003eorder might not match the actual allocated memory.\n\nUse bpage-\u003eorder for the allocation to prevent this race.","modified":"2026-09-13T03:47:18.517107200Z","published":"2026-09-11T19:43:51.357Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89503.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2dc510957fe8fd098ab3c3147ebdf34d00cd2734"},{"type":"WEB","url":"https://git.kernel.org/stable/c/53106e9262a310ef2c9a9321168c03705940c678"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e743527c5bfdceda1095bc0a9e596e2aebb6a9c3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89503.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89503"},{"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":"bce761d757452ba5eb77e11fecc37a04b67494e7"},{"fixed":"2dc510957fe8fd098ab3c3147ebdf34d00cd2734"},{"fixed":"53106e9262a310ef2c9a9321168c03705940c678"},{"fixed":"e743527c5bfdceda1095bc0a9e596e2aebb6a9c3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89503.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.8.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89503.json"}}],"schema_version":"1.9.0"}