{"id":"CVE-2026-93137","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free on mm_struct in bpf_find_vma()\n\nbpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without\nholding a reference on the mm","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free on mm_struct in bpf_find_vma()\n\nbpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without\nholding a reference on the mm. On a foreig…","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","vendor":"Linux","product":"Linux","affected":["Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 < db347840d6b6ee9bb9b8e4a985d4b4419f9f3200","Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 < 8e1101fc4118019a69c96ced4aec93164f89cbd5","Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 < c7ad910e987008e125eeff448892e86852173384","Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 < 86d54cf069fc5ae2e111c87933bebf6eb527978e","Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 < 2b2a903bee56d312539046d9defa8023eec94760","Linux >= 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 < 47b079e2117a2ee52e21f8b72935900c702fc0b5","Linux 5.17"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:18:22.207","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93137","references":[{"url":"https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00159,"epssPercentile":0.05517,"ingestedAt":"2026-09-17T16:21:47.745Z","slug":"CVE-2026-93137","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free on mm_struct in bpf_find_vma()\n\nbpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without\nholding a reference on the mm. On a foreign task, a concurrent exit_mm()\ncan free the mm_struct between the lockless read and the trylock,\nresulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU.\n\nFor the current task, task->mm is stable. For a foreign task, pin the mm\nunder task->alloc_lock and release it with mmput_async(), mirroring commit\nd8e27d2d22b6 (\"bpf: fix mm lifecycle in open-coded task_vma iterator\").\nUse spin_trylock() instead of get_task_mm() so BPF context does not block\non alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the\nforeign-task path because dropping the mm reference is not safe there.\n\nRace:\n\n  CPU0 (BPF program)                  CPU1 (exiting task)\n  ============================        ==========================\n  bpf_find_vma(foreign_task):\n    mm = task->mm\n                                      exit_mm():\n                                        task->mm = NULL\n                                        mmput(mm) -> frees mm_struct\n    mmap_read_trylock(mm)\n        // UAF on mm\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207389,"id":"CVE-2026-93137","ts":1789757342999,"field":"cvss","old":null,"new":"7.8"},{"seq":207388,"id":"CVE-2026-93137","ts":1789757342999,"field":"severity","old":"none","new":"high"}]}