{"id":"CVE-2022-50193","summary":"erofs: wake up all waiters after z_erofs_lzma_head ready","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: wake up all waiters after z_erofs_lzma_head ready\n\nWhen the user mounts the erofs second times, the decompression thread\nmay hung. The problem happens due to a sequence of steps like the\nfollowing:\n\n1) Task A called z_erofs_load_lzma_config which obtain all of the node\n   from the z_erofs_lzma_head.\n\n2) At this time, task B called the z_erofs_lzma_decompress and wanted to\n   get a node. But the z_erofs_lzma_head was empty, the Task B had to\n   sleep.\n\n3) Task A release nodes and push nodes into the z_erofs_lzma_head. But\n   task B was still sleeping.\n\nOne example report when the hung happens:\ntask:kworker/u3:1 state:D stack:14384 pid: 86 ppid: 2 flags:0x00004000\nWorkqueue: erofs_unzipd z_erofs_decompressqueue_work\nCall Trace:\n \u003cTASK\u003e\n __schedule+0x281/0x760\n schedule+0x49/0xb0\n z_erofs_lzma_decompress+0x4bc/0x580\n ? cpu_core_flags+0x10/0x10\n z_erofs_decompress_pcluster+0x49b/0xba0\n ? __update_load_avg_se+0x2b0/0x330\n ? __update_load_avg_se+0x2b0/0x330\n ? update_load_avg+0x5f/0x690\n ? update_load_avg+0x5f/0x690\n ? set_next_entity+0xbd/0x110\n ? _raw_spin_unlock+0xd/0x20\n z_erofs_decompress_queue.isra.0+0x2e/0x50\n z_erofs_decompressqueue_work+0x30/0x60\n process_one_work+0x1d3/0x3a0\n worker_thread+0x45/0x3a0\n ? process_one_work+0x3a0/0x3a0\n kthread+0xe2/0x110\n ? kthread_complete_and_exit+0x20/0x20\n ret_from_fork+0x22/0x30\n \u003c/TASK\u003e","modified":"2026-08-12T03:51:26.718415092Z","published":"2025-06-18T11:03:38.262Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50193.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2478e36ec437a27f8a05bea9e4269a68c554e21f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2df7c4bd7c1d2bc5ece5e9ed19dbd386810c2a65"},{"type":"WEB","url":"https://git.kernel.org/stable/c/96aa2a6a89618d850ef082e4268007e840c28769"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50193.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50193"},{"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":"622ceaddb7649ca328832f50ba1400af778d75fa"},{"fixed":"2478e36ec437a27f8a05bea9e4269a68c554e21f"},{"fixed":"96aa2a6a89618d850ef082e4268007e840c28769"},{"fixed":"2df7c4bd7c1d2bc5ece5e9ed19dbd386810c2a65"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50193.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.18.18"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.19.0"},{"fixed":"5.19.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50193.json"}}],"schema_version":"1.9.0"}