{"id":"CVE-2026-46210","summary":"media: iris: fix use-after-free of fmt_src during MBPF check","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: iris: fix use-after-free of fmt_src during MBPF check\n\nDuring concurrency testing, multiple instances can run in parallel, and\neach instance uses its own inst-\u003elock while the core-\u003elock protects the\nlist of active instances. The race happens because these locks cover\ndifferent scopes, inst-\u003elock protects only the internals of a single\ninstance, while the Macro Blocks Per Frame (MBPF) checker walks the\ncore list under core-\u003elock and reads fields like fmt_src-\u003ewidth and\nfmt_src-\u003eheight. At the same time, iris_close() may free fmt_src and\nfmt_dst under inst-\u003elock while the instance is still present in the core\nlist. This allows a situation where the MBPF checker, still iterating\nthrough the core list, reaches an instance whose fmt_src was already\nfreed by another thread and ends up dereferencing a dangling pointer,\nresulting in a use-after-free. This happens because the MBPF checker\nassumes that any instance in the core list is fully valid, but the\nfreeing of fmt_src and fmt_dst without removing the instance from the\ncore list is not correct.\n\nThe correct ordering is to defer freeing fmt_src and fmt_dst until after\nthe instance has been removed from the core list and all teardown under\nthe core lock has completed, ensuring that no dangling pointers are ever\nexposed during MBPF checks.","modified":"2026-07-08T08:09:40.762408252Z","published":"2026-05-28T09:40:27.884Z","related":["openSUSE-SU-2026:10954-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46210.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3d9593ad1a58c5acc3e5fa2a48222bb7632e6812"},{"type":"WEB","url":"https://git.kernel.org/stable/c/494ffd1712a588e590e6b1e9f876a8c8b24a9180"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46210.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46210"},{"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":"5ad964ad5656668399f00c76707f0d063b64a4b1"},{"fixed":"494ffd1712a588e590e6b1e9f876a8c8b24a9180"},{"fixed":"3d9593ad1a58c5acc3e5fa2a48222bb7632e6812"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46210.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"7.0.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46210.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}