{"id":"CVE-2026-90247","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix mmap_lock leak in irq_work path\n\nstack_map_get_build_id_offset() introduced a per-CPU irq_work to defer\nmmap_read_unlock() from NMI context, and bpf_find_vma()…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix mmap_lock leak in irq_work path\n\nstack_map_get_build_id_offset() introduced a per-CPU irq_work to defer\nmmap_read_unlock() from NMI context, and bpf_find_vma()…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= eac9153f2b584c702cea02c1f1a57d85aa9aea42 < a052ad5edccf5319f50ed955de4368f8318a9f20","Linux >= eac9153f2b584c702cea02c1f1a57d85aa9aea42 < 051f2da26ce377f683b938a3382e0f16d02f3139","Linux >= eac9153f2b584c702cea02c1f1a57d85aa9aea42 < fa9dcacdcdf487f0ffef64bf67622f1caed509f1","Linux a7f4da875c16f3b8bef0d9ec67528111045bfcd8","Linux f1838da73cccb238b8be4ef464fce0168dc7ba84","Linux >= 4.19.92 < 4.20","Linux >= 5.4.7 < 5.5","Linux 5.5"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:20.803","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90247","references":[{"url":"https://git.kernel.org/stable/c/051f2da26ce377f683b938a3382e0f16d02f3139","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a052ad5edccf5319f50ed955de4368f8318a9f20","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fa9dcacdcdf487f0ffef64bf67622f1caed509f1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.845Z","epss":0.00198,"epssPercentile":0.09866,"slug":"CVE-2026-90247","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix mmap_lock leak in irq_work path\n\nstack_map_get_build_id_offset() introduced a per-CPU irq_work to defer\nmmap_read_unlock() from NMI context, and bpf_find_vma() later reused the\nsame mmap_unlock_work. Both callers only check whether the work is busy\nbefore taking mmap_lock, so a nested caller can reuse the slot before the\nfirst caller queues it. Two read locks may then be acquired while only one\ndeferred unlock runs, leaking a read lock and blocking exit_mmap().\n\nReserve the per-CPU slot before mmap_read_trylock(). Use the same wrapper\nin stackmap and bpf_find_vma() so both callers release the reservation on\ntrylock failure. Keep rejecting the slot while the irq_work remains busy.\nRelease it after the irq_work callback unlocks the mm.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}