{"id":"CVE-2026-90209","summary":"s390/debug: Fix deadlock during unregister","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/debug: Fix deadlock during unregister\n\nUnregistering an s390dbf debug area while one of the associated debugfs\nfiles is being written to can cause a deadlock:\n\n$ echo \u003e.../vmur/level    $ rmmod vmur\n===================================================\ndebugfs write\ndebugfs_file_get()\n                          debug_unregister()\n                          mutex_lock(debug_mutex)\n                          debugfs_remove()\n                          wait for debugfs_file_put()\ndebug_file_ops.write()\ndebug_input()\nmutex_lock(debug_mutex) ==\u003e DEADLOCK\n\nFix this by splitting debug_unregister() into an s390dbf and debugfs\npart, and running only the s390dbf part with debug_mutex locked.","modified":"2026-09-19T03:47:25.347676422Z","published":"2026-09-17T16:07:24.126Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90209.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/183f8f6d64bb0510070c856b9927618c53014a7b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/445c31ac638fd1af203d79bdf25fc0cb3149fbbc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba"},{"type":"WEB","url":"https://git.kernel.org/stable/c/54e1259b75d6402a1d0cfb822b9bb2c507e53dab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d83f3faa3fb7f23f298cfd40382611999de5d1d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a08b70ed2d1ec907353a72f15163b8e34ff4b2f8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90209.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90209"},{"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":"9372a82892c2caa6bccab9a4081166fa769699f8"},{"fixed":"a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed"},{"fixed":"183f8f6d64bb0510070c856b9927618c53014a7b"},{"fixed":"a08b70ed2d1ec907353a72f15163b8e34ff4b2f8"},{"fixed":"45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba"},{"fixed":"5d83f3faa3fb7f23f298cfd40382611999de5d1d"},{"fixed":"54e1259b75d6402a1d0cfb822b9bb2c507e53dab"},{"fixed":"445c31ac638fd1af203d79bdf25fc0cb3149fbbc"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"c68ba4a708fbd0efdc384cd29250bb292a45e559"},{"last_affected":"86f9980909f31ab205323eeeb290fe3cbb4952b4"},{"last_affected":"fe5793e90d3f572a87ba67fe2f0e1679fdff14f8"},{"last_affected":"e234f66168f0d50c0d28154fb983a14e85c3c526"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.146"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.65"},{"fixed":"5.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.13.17"},{"fixed":"5.14"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.14.4"},{"fixed":"5.15"}]}],"versions":["v5.14","v5.14-rc3","v5.14-rc1","v5.14.3","v5.13.16","v5.10.64","v5.4.145","v5.14.2","v5.13.15","v5.10.63","v5.4.144","v5.14.1","v5.13.14","v5.10.62","v5.13.13","v5.10.61","v5.4.143","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.4.142","v5.10.60","v5.13.12","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.13.11","v5.10.59","v5.4.141","v5.13.10","v5.10.58","v5.4.140","v5.13.9","v5.10.57","v5.4.139","v5.13.8","v5.10.56","v5.4.138","v5.13.7","v5.10.55","v5.4.137","v5.13","v5.4.136","v5.10.54","v5.13.6","v5.13.5","v5.10.53","v5.4.135","v5.13.4","v5.10.52","v5.4.134","v5.4.133","v5.10.51","v5.13.3","v5.13.2","v5.10.50","v5.4.132","v5.13.1","v5.10.49","v5.4.131","v5.10.48","v5.4.130","v5.13-rc6","v5.4.129","v5.10.47","v5.13-rc7","v5.4.128","v5.10.46","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.10.45","v5.4.127","v5.10.44","v5.4.126","v5.13-rc5","v5.10.43","v5.4.125","v5.10.42","v5.4.124","v5.10.41","v5.4.123","v5.10.40","v5.4.122","v5.10.39","v5.4.121","v5.12","v5.10.38","v5.4.120","v5.10.37","v5.4.119","v5.10.36","v5.4.118","v5.10.35","v5.4.117","v5.10.34","v5.4.116","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.10.33","v5.4.115","v5.10.32","v5.4.114","v5.12-rc8","v5.12-rc3","v5.10.31","v5.4.113","v5.12-rc7","v5.12-rc5","v5.4.112","v5.10.30","v5.12-rc6","v5.10.29","v5.4.111","v5.10.28","v5.4.110","v5.10.27","v5.4.109","v5.12-rc4","v5.10","v5.4.108","v5.10.26","v5.10.25","v5.11","v5.4.107","v5.10.24","v5.4.106","v5.10.23","v5.4.105","v5.10.22","v5.4.104","v5.10.21","v5.4.103","v5.10.20","v5.4.102","v5.10.19","v5.4.101","v5.10.18","v5.4.100","v5.11-rc3","v5.10.17","v5.4.99","v5.11-rc7","v5.11-rc6","v5.10.16","v5.4.98","v5.11-rc5","v5.11-rc1","v5.10.15","v5.4.97","v5.11-rc4","v5.10.14","v5.4.96","v5.11-rc2","v5.10.13","v5.4.95","v5.10.12","v5.4.94","v5.10.11","v5.4.93","v5.10.10","v5.4.92","v5.10.9","v5.4.91","v5.10-rc1","v5.10.8","v5.4.90","v5.10.7","v5.4.89","v5.10.6","v5.4.88","v5.10.5","v5.4.87","v5.10.4","v5.4.86","v5.10.3","v5.4.85","v5.10.2","v5.10.1","v5.4.84","v5.10-rc7","v5.4.83","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.4.82","v5.10-rc2","v5.10-rc5","v5.4.81","v5.4.80","v5.4.79","v5.4.78","v5.4.77","v5.4.76","v5.4.75","v5.4.74","v5.4.73","v5.4.72","v5.9-rc1","v5.9-rc7","v5.4.71","v5.4.70","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.4.69","v5.9-rc3","v5.4.6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