{"id":"CVE-2023-53783","summary":"blk-iocost: fix divide by 0 error in calc_lcoefs()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-iocost: fix divide by 0 error in calc_lcoefs()\n\necho max of u64 to cost.model can cause divide by 0 error.\n\n  # echo 8:0 rbps=18446744073709551615 \u003e /sys/fs/cgroup/io.cost.model\n\n  divide error: 0000 [#1] PREEMPT SMP\n  RIP: 0010:calc_lcoefs+0x4c/0xc0\n  Call Trace:\n   \u003cTASK\u003e\n   ioc_refresh_params+0x2b3/0x4f0\n   ioc_cost_model_write+0x3cb/0x4c0\n   ? _copy_from_iter+0x6d/0x6c0\n   ? kernfs_fop_write_iter+0xfc/0x270\n   cgroup_file_write+0xa0/0x200\n   kernfs_fop_write_iter+0x17d/0x270\n   vfs_write+0x414/0x620\n   ksys_write+0x73/0x160\n   __x64_sys_write+0x1e/0x30\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\ncalc_lcoefs() uses the input value of cost.model in DIV_ROUND_UP_ULL,\noverflow would happen if bps plus IOC_PAGE_SIZE is greater than\nULLONG_MAX, it can cause divide by 0 error.\n\nFix the problem by setting basecost","modified":"2026-03-20T12:33:20.331701Z","published":"2025-12-09T00:00:38.679Z","related":["SUSE-SU-2026:0263-1","SUSE-SU-2026:0317-1","SUSE-SU-2026:0411-1","SUSE-SU-2026:0617-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53783.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3538ade9d8c2ba41088e395de916f2599fadba8f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e291810fe83a384700eb24a1f714966391ed562"},{"type":"WEB","url":"https://git.kernel.org/stable/c/984af1e66b4126cf145153661cc24c213e2ec231"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9e8bf9f95f7a299fa9ea45b678d001806ad5e12c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b96d7b4a9745fbd0c8384608ceb1f50415e862fa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bf8eb1fd6110871e6232e8e7efe399276ef7e6f6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53783.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53783"},{"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":"7caa47151ab2e644dd221f741ec7578d9532c9a3"},{"fixed":"9e8bf9f95f7a299fa9ea45b678d001806ad5e12c"},{"fixed":"6e291810fe83a384700eb24a1f714966391ed562"},{"fixed":"3538ade9d8c2ba41088e395de916f2599fadba8f"},{"fixed":"bf8eb1fd6110871e6232e8e7efe399276ef7e6f6"},{"fixed":"b96d7b4a9745fbd0c8384608ceb1f50415e862fa"},{"fixed":"984af1e66b4126cf145153661cc24c213e2ec231"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53783.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.4.0"},{"fixed":"5.4.235"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.173"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.99"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.2.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53783.json"}}],"schema_version":"1.7.5"}