{"id":"CVE-2026-90247","summary":"bpf: Fix mmap_lock leak in irq_work path","details":"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() 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.","modified":"2026-09-19T03:47:25.545790514Z","published":"2026-09-17T16:07:49.444Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90247.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/051f2da26ce377f683b938a3382e0f16d02f3139"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a052ad5edccf5319f50ed955de4368f8318a9f20"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fa9dcacdcdf487f0ffef64bf67622f1caed509f1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90247.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90247"},{"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":"eac9153f2b584c702cea02c1f1a57d85aa9aea42"},{"fixed":"a052ad5edccf5319f50ed955de4368f8318a9f20"},{"fixed":"051f2da26ce377f683b938a3382e0f16d02f3139"},{"fixed":"fa9dcacdcdf487f0ffef64bf67622f1caed509f1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"a7f4da875c16f3b8bef0d9ec67528111045bfcd8"},{"last_affected":"f1838da73cccb238b8be4ef464fce0168dc7ba84"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.92"},{"fixed":"4.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.7"},{"fixed":"5.5"}]}],"versions":["v5.4","v5.4.6","v4.19.91","v5.4.5","v4.19.90","v5.4.4","v4.19.89","v5.4.3","v4.19.88","v5.4.2","v5.4-rc1","v4.19.87","v5.4.1","v5.4-rc6","v5.4-rc3","v4.19.86","v5.4-rc4","v5.4-rc8","v4.19.85","v4.19.84","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v4.19.83","v4.19.82","v4.19.81","v4.19.80","v4.19.79","v4.19.78","v4.19.77","v4.19.76","v4.19.75","v5.3-rc5","v5.3-rc1","v4.19.74","v5.3-rc2","v4.19.73","v5.3-rc3","v5.3-rc8","v4.19.72","v5.3-rc7","v5.3-rc4","v4.19.71","v4.19.70","v4.19.69","v5.2","v5.3-rc6","v4.19.68","v4.19.67","v4.19.66","v4.19.65","v4.19.64","v4.19.63","v4.19.62","v4.19.61","v4.19.60","v5.2-rc2","v4.19.59","v5.2-rc7","v5.2-rc4","v4.19.58","v5.2-rc1","v4.19.57","v5.2-rc5","v5.2-rc6","v4.19.56","v5.2-rc3","v4.19.55","v5.1","v4.19.54","v4.19.53","v4.19.52","v4.19.51","v4.19.50","v4.19.49","v4.19.48","v4.19.47","v4.19.46","v4.19.45","v4.19.44","v4.19.43","v5.0-rc8","v4.19.42","v5.1-rc7","v5.1-rc1","v4.19.41","v5.1-rc6","v4.19.40","v5.1-rc5","v4.19.39","v4.19.38","v5.0","v4.19.37","v5.1-rc3","v4.19.36","v5.1-rc2","v4.19.35","v5.1-rc4","v4.19.34","v5.0-rc1","v4.19.33","v4.19.32","v4.19.31","v4.19.30","v4.19.29","v4.19.28","v4.19.27","v4.19.26","v5.0-rc4","v5.0-rc3","v5.0-rc6","v4.19.25","v5.0-rc7","v4.19.24","v5.0-rc2","v4.19.23","v5.0-rc5","v4.19.22","v4.19.21","v4.19.20","v4.19.19","v4.19.18","v4.19.17","v4.20-rc1","v4.19.16","v4.19","v4.19.15","v4.20","v4.19.14","v4.19.13","v4.20-rc7","v4.20-rc5","v4.19.12","v4.20-rc6","v4.19.11","v4.19.10","v4.20-rc4","v4.20-rc2","v4.19.9","v4.19.8","v4.20-rc3","v4.19.7","v4.19.6","v4.19.5","v4.19.4","v4.19.3","v4.19.2","v4.19.1","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.17","v4.18-rc3","v4.18-rc4","v4.17-rc1","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.17-rc6","v4.17-rc5","v4.16-rc7","v4.16-rc4","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.16-rc3","v4.16-rc6","v4.14","v4.15","v4.15-rc1","v4.15-rc4","v4.15-rc9","v4.15-rc8","v4.15-rc7","v4.15-rc3","v4.15-rc2","v4.15-rc5","v4.15-rc6","v4.14-rc1","v4.14-rc7","v4.14-rc3","v4.13","v4.14-rc8","v4.14-rc4","v4.14-rc6","v4.14-rc2","v4.14-rc5","v4.13-rc2","v4.13-rc1","v4.13-rc3","v4.13-rc7","v4.13-rc4","v4.13-rc5","v4.13-rc6","v4.12-rc1","v4.12","v4.12-rc5","v4.12-rc7","v4.12-rc6","v4.12-rc4","v4.12-rc2","v4.12-rc3","v4.11","v4.11-rc1","v4.11-rc6","v4.11-rc8","v4.11-rc7","v4.11-rc3","v4.11-rc5","v4.11-rc2","v4.11-rc4","v4.10","v4.9","v4.10-rc8","v4.10-rc3","v4.10-rc1","v4.10-rc7","v4.10-rc6","v4.10-rc2","v4.10-rc5","v4.10-rc4","v4.9-rc7","v4.9-rc6","v4.9-rc8","v4.9-rc1","v4.9-rc5","v4.9-rc3","v4.9-rc4","v4.9-rc2","v4.8","v4.8-rc8","v4.8-rc2","v4.8-rc1","v4.8-rc7","v4.8-rc6","v4.8-rc5","v4.8-rc4","v4.8-rc3","v4.7","v4.7-rc4","v4.7-rc2","v4.7-rc1","v4.7-rc7","v4.7-rc6","v4.7-rc3","v4.7-rc5","v4.6","v4.6-rc1","v4.6-rc6","v4.6-rc4","v4.6-rc7","v4.6-rc5","v4.5-rc4","v4.6-rc2","v4.6-rc3","v4.5","v4.4","v4.5-rc1","v4.5-rc6","v4.5-rc2","v4.5-rc7","v4.5-rc5","v4.5-rc3","v4.4-rc1","v4.4-rc2","v4.4-rc8","v4.4-rc3","v4.4-rc7","v4.4-rc5","v4.4-rc6","v4.4-rc4","v4.3","v4.3-rc1","v4.3-rc6","v4.3-rc4","v4.3-rc2","v4.3-rc7","v4.3-rc5","v4.3-rc3","v4.2","v4.2-rc2","v4.2-rc1","v4.2-rc8","v4.2-rc4","v4.2-rc6","v4.2-rc7","v4.0-rc5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