{"id":"CVE-2026-90209","published":"2026-09-17T17:17:16.060","lastModified":"2026-09-17T17:17:16.060","description":"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 >.../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) ==> DEADLOCK\n\nFix this by splitting debug_unregister() into an s390dbf and debugfs\npart, and running only the s390dbf part with debug_mutex locked.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/183f8f6d64bb0510070c856b9927618c53014a7b","tags":[]},{"url":"https://git.kernel.org/stable/c/445c31ac638fd1af203d79bdf25fc0cb3149fbbc","tags":[]},{"url":"https://git.kernel.org/stable/c/45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba","tags":[]},{"url":"https://git.kernel.org/stable/c/54e1259b75d6402a1d0cfb822b9bb2c507e53dab","tags":[]},{"url":"https://git.kernel.org/stable/c/5d83f3faa3fb7f23f298cfd40382611999de5d1d","tags":[]},{"url":"https://git.kernel.org/stable/c/a08b70ed2d1ec907353a72f15163b8e34ff4b2f8","tags":[]},{"url":"https://git.kernel.org/stable/c/a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}