{"id":"CVE-2026-46210","title":"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->l…","summary":"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->l…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 6.18, < 7.0.9","linux_kernel = 7.1"],"patched":["linux_kernel 7.0.9"],"published":"2026-05-28","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:17:32.110","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-46210","references":[{"url":"https://git.kernel.org/stable/c/3d9593ad1a58c5acc3e5fa2a48222bb7632e6812","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/494ffd1712a588e590e6b1e9f876a8c8b24a9180","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/96889fcdb0988108a19a29b0467717a503651a73","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00165,"epssPercentile":0.05342,"ingestedAt":"2026-10-15T11:00:41.709Z","slug":"CVE-2026-46210","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 6.18, < 7.0.9`\n- `linux_kernel = 7.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.0.9`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}