{"cve":"CVE-2026-46210","nvd":{"published":"2026-05-28T10:16:36.673","modified":"2026-10-15T11:17:32.110","status":"Modified","description":"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->lock while the core->lock protects the\nlist of active instances. The race happens because these locks cover\ndifferent scopes, inst->lock protects only the internals of a single\ninstance, while the Macro Blocks Per Frame (MBPF) checker walks the\ncore list under core->lock and reads fields like fmt_src->width and\nfmt_src->height. At the same time, iris_close() may free fmt_src and\nfmt_dst under inst->lock 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/3d9593ad1a58c5acc3e5fa2a48222bb7632e6812","https://git.kernel.org/stable/c/494ffd1712a588e590e6b1e9f876a8c8b24a9180","https://git.kernel.org/stable/c/96889fcdb0988108a19a29b0467717a503651a73"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-46210","score":0.00133,"percentile":0.02786,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}