{"id":"CVE-2023-52811","summary":"scsi: ibmvfc: Remove BUG_ON in the case of an empty event pool","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ibmvfc: Remove BUG_ON in the case of an empty event pool\n\nIn practice the driver should never send more commands than are allocated\nto a queue's event pool. In the unlikely event that this happens, the code\nasserts a BUG_ON, and in the case that the kernel is not configured to\ncrash on panic returns a junk event pointer from the empty event list\ncausing things to spiral from there. This BUG_ON is a historical artifact\nof the ibmvfc driver first being upstreamed, and it is well known now that\nthe use of BUG_ON is bad practice except in the most unrecoverable\nscenario. There is nothing about this scenario that prevents the driver\nfrom recovering and carrying on.\n\nRemove the BUG_ON in question from ibmvfc_get_event() and return a NULL\npointer in the case of an empty event pool. Update all call sites to\nibmvfc_get_event() to check for a NULL pointer and perfrom the appropriate\nfailure or recovery action.","modified":"2026-04-02T09:43:22.330367Z","published":"2024-05-21T15:31:20.282Z","related":["SUSE-SU-2024:2008-1","SUSE-SU-2024:2011-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2189-1","SUSE-SU-2024:2190-1","SUSE-SU-2024:2360-1","SUSE-SU-2024:2381-1","SUSE-SU-2024:2561-1","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-2023-52811.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/88984ec4792766df5a9de7a2ff2b5f281f94c7d4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8bbe784c2ff28d56ca0c548aaf3e584edc77052d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b39f2d10b86d0af353ea339e5815820026bca48f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2af4ef80601224b90630c1ddc7cd2c7c8ab4dd8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e1d1f79b1929dce470a5dc9281c574cd58e8c6c0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52811.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52811"},{"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":"072b91f9c6510d0ec4a49d07dbc318760c7da7b3"},{"fixed":"e1d1f79b1929dce470a5dc9281c574cd58e8c6c0"},{"fixed":"88984ec4792766df5a9de7a2ff2b5f281f94c7d4"},{"fixed":"d2af4ef80601224b90630c1ddc7cd2c7c8ab4dd8"},{"fixed":"8bbe784c2ff28d56ca0c548aaf3e584edc77052d"},{"fixed":"b39f2d10b86d0af353ea339e5815820026bca48f"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52811.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}