{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53783","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-08T23:58:35.272Z","datePublished":"2025-12-09T00:00:38.679Z","dateUpdated":"2026-05-11T19:51:26.633Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:51:26.633Z"},"descriptions":[{"lang":"en","value":"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 > /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   <TASK>\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"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/blk-iocost.c"],"versions":[{"version":"7caa47151ab2e644dd221f741ec7578d9532c9a3","lessThan":"9e8bf9f95f7a299fa9ea45b678d001806ad5e12c","status":"affected","versionType":"git"},{"version":"7caa47151ab2e644dd221f741ec7578d9532c9a3","lessThan":"6e291810fe83a384700eb24a1f714966391ed562","status":"affected","versionType":"git"},{"version":"7caa47151ab2e644dd221f741ec7578d9532c9a3","lessThan":"3538ade9d8c2ba41088e395de916f2599fadba8f","status":"affected","versionType":"git"},{"version":"7caa47151ab2e644dd221f741ec7578d9532c9a3","lessThan":"bf8eb1fd6110871e6232e8e7efe399276ef7e6f6","status":"affected","versionType":"git"},{"version":"7caa47151ab2e644dd221f741ec7578d9532c9a3","lessThan":"b96d7b4a9745fbd0c8384608ceb1f50415e862fa","status":"affected","versionType":"git"},{"version":"7caa47151ab2e644dd221f741ec7578d9532c9a3","lessThan":"984af1e66b4126cf145153661cc24c213e2ec231","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/blk-iocost.c"],"versions":[{"version":"5.4","status":"affected"},{"version":"0","lessThan":"5.4","status":"unaffected","versionType":"semver"},{"version":"5.4.235","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.173","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.99","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.16","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.2.3","lessThanOrEqual":"6.2.*","status":"unaffected","versionType":"semver"},{"version":"6.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.4.235"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.10.173"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.15.99"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.1.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/9e8bf9f95f7a299fa9ea45b678d001806ad5e12c"},{"url":"https://git.kernel.org/stable/c/6e291810fe83a384700eb24a1f714966391ed562"},{"url":"https://git.kernel.org/stable/c/3538ade9d8c2ba41088e395de916f2599fadba8f"},{"url":"https://git.kernel.org/stable/c/bf8eb1fd6110871e6232e8e7efe399276ef7e6f6"},{"url":"https://git.kernel.org/stable/c/b96d7b4a9745fbd0c8384608ceb1f50415e862fa"},{"url":"https://git.kernel.org/stable/c/984af1e66b4126cf145153661cc24c213e2ec231"}],"title":"blk-iocost: fix divide by 0 error in calc_lcoefs()","x_generator":{"engine":"bippy-1.2.0"}}}}