{"id":"CVE-2023-52849","summary":"cxl/mem: Fix shutdown order","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/mem: Fix shutdown order\n\nIra reports that removing cxl_mock_mem causes a crash with the following\ntrace:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000044\n [..]\n RIP: 0010:cxl_region_decode_reset+0x7f/0x180 [cxl_core]\n [..]\n Call Trace:\n  \u003cTASK\u003e\n  cxl_region_detach+0xe8/0x210 [cxl_core]\n  cxl_decoder_kill_region+0x27/0x40 [cxl_core]\n  cxld_unregister+0x29/0x40 [cxl_core]\n  devres_release_all+0xb8/0x110\n  device_unbind_cleanup+0xe/0x70\n  device_release_driver_internal+0x1d2/0x210\n  bus_remove_device+0xd7/0x150\n  device_del+0x155/0x3e0\n  device_unregister+0x13/0x60\n  devm_release_action+0x4d/0x90\n  ? __pfx_unregister_port+0x10/0x10 [cxl_core]\n  delete_endpoint+0x121/0x130 [cxl_core]\n  devres_release_all+0xb8/0x110\n  device_unbind_cleanup+0xe/0x70\n  device_release_driver_internal+0x1d2/0x210\n  bus_remove_device+0xd7/0x150\n  device_del+0x155/0x3e0\n  ? lock_release+0x142/0x290\n  cdev_device_del+0x15/0x50\n  cxl_memdev_unregister+0x54/0x70 [cxl_core]\n\nThis crash is due to the clearing out the cxl_memdev's driver context\n(@cxlds) before the subsystem is done with it. This is ultimately due to\nthe region(s), that this memdev is a member, being torn down and expecting\nto be able to de-reference @cxlds, like here:\n\nstatic int cxl_region_decode_reset(struct cxl_region *cxlr, int count)\n...\n                if (cxlds-\u003ercd)\n                        goto endpoint_reset;\n...\n\nFix it by keeping the driver context valid until memdev-device\nunregistration, and subsequently the entire stack of related\ndependencies, unwinds.","modified":"2026-05-18T05:55:58.279977845Z","published":"2024-05-21T15:31:45.884Z","related":["SUSE-SU-2024:2571-1","SUSE-SU-2024:2896-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52849.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52849.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52849"},{"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":"9cc238c7a526dba9ee8c210fa2828886fc65db66"},{"fixed":"20bd0198bebdd706bd4614b3933ef70d7c19618f"},{"fixed":"7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b"},{"fixed":"cad22a757029c3a1985c221a2d4a6491ad4035ae"},{"fixed":"0ca074f7d788627a4e0b047ca5fbdb5fc567220c"},{"fixed":"88d3917f82ed4215a2154432c26de1480a61b209"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"964a9834492210f48b360baa9e20a9eedf4d08ff"}]}],"versions":["v5.14","v5.14-rc3","v5.14-rc1","v5.14.7","v5.14.6","v5.14.5","v5.14.4","v5.14.3","v5.14.2","v5.14.1","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.13","v5.13-rc6","v5.13-rc7","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.13-rc5","v5.12","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.12-rc8","v5.12-rc3","v5.12-rc7","v5.12-rc5","v5.12-rc6","v5.12-rc4","v5.10","v5.11","v5.11-rc3","v5.11-rc7","v5.11-rc6","v5.11-rc5","v5.11-rc1","v5.11-rc4","v5.11-rc2","v5.10-rc1","v5.10-rc7","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.10-rc2","v5.10-rc5","v5.9-rc1","v5.9-rc7","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.9-rc3","v5.9-rc2","v5.8","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.8-rc5","v5.8-rc3","v5.8-rc4","v5.8-rc6","v5.7-rc4","v5.7-rc7","v5.7-rc1","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.7-rc6","v5.6","v5.6-rc1","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.5","v5.5-rc5","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4","v5.5-rc4","v5.5-rc3","v5.5-rc6","v5.4-rc1","v5.4-rc6","v5.4-rc3","v5.4-rc4","v5.4-rc8","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v5.3-rc5","v5.3-rc1","v5.3-rc2","v5.3-rc3","v5.3-rc8","v5.3-rc7","v5.3-rc4","v5.2","v5.3-rc6","v5.2-rc2","v5.2-rc7","v5.2-rc4","v5.2-rc1","v5.2-rc5","v5.2-rc6","v5.2-rc3","v5.1","v5.0-rc8","v5.1-rc7","v5.1-rc1","v5.1-rc6","v5.1-rc5","v5.0","v5.1-rc3","v5.1-rc2","v5.1-rc4","v5.0-rc1","v5.0-rc4","v5.0-rc3","v5.0-rc6","v5.0-rc7","v5.0-rc2","v5.0-rc5","v4.20-rc1","v4.19","v4.20","v4.20-rc7","v4.20-rc5","v4.20-rc6","v4.20-rc4","v4.20-rc2","v4.20-rc3","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"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