{"id":"CVE-2022-49607","summary":"perf/core: Fix data race between perf_event_set_output() and perf_mmap_close()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix data race between perf_event_set_output() and perf_mmap_close()\n\nYang Jihing reported a race between perf_event_set_output() and\nperf_mmap_close():\n\n\tCPU1\t\t\t\t\tCPU2\n\n\tperf_mmap_close(e2)\n\t  if (atomic_dec_and_test(&e2-\u003erb-\u003emmap_count)) // 1 - \u003e 0\n\t    detach_rest = true\n\n\t\t\t\t\t\tioctl(e1, IOC_SET_OUTPUT, e2)\n\t\t\t\t\t\t  perf_event_set_output(e1, e2)\n\n\t  ...\n\t  list_for_each_entry_rcu(e, &e2-\u003erb-\u003eevent_list, rb_entry)\n\t    ring_buffer_attach(e, NULL);\n\t    // e1 isn't yet added and\n\t    // therefore not detached\n\n\t\t\t\t\t\t    ring_buffer_attach(e1, e2-\u003erb)\n\t\t\t\t\t\t      list_add_rcu(&e1-\u003erb_entry,\n\t\t\t\t\t\t\t\t   &e2-\u003erb-\u003eevent_list)\n\nAfter this; e1 is attached to an unmapped rb and a subsequent\nperf_mmap() will loop forever more:\n\n\tagain:\n\t\tmutex_lock(&e-\u003emmap_mutex);\n\t\tif (event-\u003erb) {\n\t\t\t...\n\t\t\tif (!atomic_inc_not_zero(&e-\u003erb-\u003emmap_count)) {\n\t\t\t\t...\n\t\t\t\tmutex_unlock(&e-\u003emmap_mutex);\n\t\t\t\tgoto again;\n\t\t\t}\n\t\t}\n\nThe loop in perf_mmap_close() holds e2-\u003emmap_mutex, while the attach\nin perf_event_set_output() holds e1-\u003emmap_mutex. As such there is no\nserialization to avoid this race.\n\nChange perf_event_set_output() to take both e1-\u003emmap_mutex and\ne2-\u003emmap_mutex to alleviate that problem. Additionally, have the loop\nin perf_mmap() detach the rb directly, this avoids having to wait for\nthe concurrent perf_mmap_close() to get around to doing it to make\nprogress.","modified":"2026-05-18T05:56:58.712080683Z","published":"2025-02-26T02:23:31.823Z","related":["SUSE-SU-2025:1027-1","SUSE-SU-2025:1176-1","SUSE-SU-2025:1183-1","SUSE-SU-2025:1241-1","SUSE-SU-2025:1293-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49607.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/17f5417194136517ee9bbd6511249e5310e5617c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3bbd868099287ff9027db59029b502fcfa2202a0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43128b3eee337824158f34da6648163d2f2fb937"},{"type":"WEB","url":"https://git.kernel.org/stable/c/68e3c69803dada336893640110cb87221bb01dcf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/98c3c8fd0d4c560e0f8335b79c407bbf7fc9462c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9391ff7a7c5f113d6f2bf6621d49110950de49c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/da3c256e2d0ebc87c7db0c605c9692b6f1722074"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f836f9ac95df15f1e0af4beb0ec20021e8c91998"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49607.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49607"},{"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":"9bb5d40cd93c9dd4be74834b1dcb1ba03629716b"},{"fixed":"3bbd868099287ff9027db59029b502fcfa2202a0"},{"fixed":"f836f9ac95df15f1e0af4beb0ec20021e8c91998"},{"fixed":"17f5417194136517ee9bbd6511249e5310e5617c"},{"fixed":"98c3c8fd0d4c560e0f8335b79c407bbf7fc9462c"},{"fixed":"43128b3eee337824158f34da6648163d2f2fb937"},{"fixed":"da3c256e2d0ebc87c7db0c605c9692b6f1722074"},{"fixed":"a9391ff7a7c5f113d6f2bf6621d49110950de49c"},{"fixed":"68e3c69803dada336893640110cb87221bb01dcf"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"2487f0db30527032c4d56fc2d0b1a240fe89fef8"},{"last_affected":"703197b61d05f5edae54bad3256901c5a5c8794c"},{"last_affected":"c52217e88ae0f3a4ae00562d86e338f8f85969b4"}]}],"versions":["v3.2.48","v3.4.51","v3.2.47","v3.4.50","v3.9.7","v3.9.6","v3.4.49","v3.2.46","v3.9.5","v3.4.48","v3.9.4","v3.4.47","v3.2.45","v3.9","v3.9.3","v3.4.46","v3.9.2","v3.4.45","v3.2.44","v3.4.44","v3.9.1","v3.4.43","v3.9-rc2","v3.9-rc7","v3.4.42","v3.9-rc8","v3.4.41","v3.2.43","v3.9-rc3","v3.9-rc6","v3.9-rc5","v3.4.40","v3.4.39","v3.9-rc4","v3.9-rc1","v3.2.42","v3.8","v3.4.38","v3.4.37","v3.2.41","v3.4.36","v3.2.40","v3.4.35","v3.2.39","v3.4.34","v3.4.33","v3.8-rc7","v3.4.32","v3.8-rc6","v3.2.38","v3.8-rc5","v3.4.31","v3.4.30","v3.8-rc2","v3.4.29","v3.2.37","v3.4.28","v3.8-rc1","v3.8-rc3","v3.8-rc4","v3.4.27","v3.4.26","v3.4.25","v3.2.36","v3.7","v3.4.24","v3.2.35","v3.4.23","v3.7-rc1","v3.6","v3.7-rc6","v3.7-rc7","v3.4.22","v3.7-rc3","v3.7-rc8","v3.2.34","v3.4.21","v3.4.20","v3.7-rc2","v3.4.19","v3.7-rc4","v3.7-rc5","v3.4.18","v3.2.33","v3.4.17","v3.4.16","v3.2.32","v3.4.15","v3.4.14","v3.2.31","v3.4.13","v3.2.30","v3.6-rc7","v3.4.12","v3.6-rc1","v3.5-rc3","v3.4.11","v3.6-rc6","v3.6-rc5","v3.5","v3.6-rc3","v3.6-rc4","v3.2.29","v3.6-rc2","v3.4.10","v3.2.28","v3.4-rc4","v3.4.9","v3.2.27","v3.4.8","v3.2.26","v3.4.7","v3.2.25","v3.2.24","v3.4.6","v3.5-rc7","v3.2.23","v3.5-rc5","v3.5-rc6","v3.4.5","v3.4.4","v3.5-rc2","v3.2.22","v3.5-rc1","v3.5-rc4","v3.2.21","v3.4","v3.4.3","v3.2.20","v3.4.2","v3.2.19","v3.4.1","v3.2.18","v3.4-rc2","v3.4-rc1","v3.2.17","v3.4-rc7","v3.4-rc6","v3.4-rc3","v3.4-rc5","v3.2.16","v3.2.15","v3.3","v3.2.14","v3.2.13","v3.3-rc6","v3.3-rc3","v3.2.12","v3.3-rc7","v3.2.11","v3.3-rc2","v3.3-rc5","v3.2","v3.2.10","v3.3-rc4","v3.2.9","v3.3-rc1","v3.2.8","v3.2.7","v3.2.6","v3.2.5","v3.2.4","v3.2.3","v3.2.2","v3.2.1","v3.2-rc4","v3.2-rc7","v3.2-rc6","v3.2-rc5","v3.2-rc3","v3.1","v3.2-rc2","v3.2-rc1","v3.1-rc1","v3.1-rc9","v3.1-rc8","v3.1-rc10","v3.1-rc7","v3.1-rc3","v3.1-rc2","v3.1-rc4","v3.1-rc5","v3.0","v3.1-rc6","v3.0-rc7","v3.0-rc4","v3.0-rc6","v3.0-rc5","v3.0-rc3","v3.0-rc1","v2.6.39","v3.0-rc2","v2.6.38","v2.6.39-rc2","v2.6.39-rc7","v2.6.39-rc5","v2.6.39-rc1","v2.6.38-rc7","v2.6.39-rc6","v2.6.39-rc4","v2.6.39-rc3","v2.6.37","v2.6.38-rc1","v2.6.38-rc8","v2.6.38-rc2","v2.6.38-rc6","v2.6.38-rc5","v2.6.38-rc4","v2.6.38-rc3","v2.6.37-rc4","v2.6.37-rc2","v2.6.36","v2.6.37-rc5","v2.6.37-rc8","v2.6.37-rc7","v2.6.37-rc6","v2.6.37-rc1","v2.6.37-rc3","v2.6.36-rc6","v2.6.35-rc4","v2.6.36-rc8","v2.6.35","v2.6.36-rc7","v2.6.36-rc3","v2.6.36-rc5","v2.6.36-rc4","v2.6.36-rc2","v2.6.36-rc1","v2.6.35-rc5","v2.6.35-rc6","v2.6.34","v2.6.35-rc3","v2.6.35-rc1","v2.6.35-rc2","v2.6.34-rc7","v2.6.34-rc6","v2.6.34-rc5","v2.6.34-rc4","v2.6.34-rc3","v2.6.34-rc2","v2.6.34-rc1","v2.6.33","v2.6.33-rc6","v2.6.33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