Not yet scoredPublished Dec 8, 2025

CVE-2023-53783blk-iocost: fix divide by 0 error in calc_lcoefs()

Updated under an hour ago (Oct 27, 2026, 4:50 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: blk-iocost: fix divide by 0 error in calc_lcoefs() echo max of u64 to cost.model can cause divide by 0 error. # echo 8:0 rbps=18446744073709551615 > /sys/fs/cgroup/io.cost.model divide error: 0000 [#1] PREEMPT SMP RIP: 0010:calc_lcoefs+0x4c/0xc0 Call Trace: <TASK> ioc_refresh_params+0x2b3/0x4f0 ioc_cost_model_write+0x3cb/0x4c0 ? _copy_from_iter+0x6d/0x6c0 ? kernfs_fop_write_iter+0xfc/0x270 cgroup_file_write+0xa0/0x200 kernfs_fop_write_iter+0x17d/0x270 vfs_write+0x414/0x620 ksys_write+0x73/0x160 __x64_sys_write+0x1e/0x30 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd calc_lcoefs() uses the input value of cost.model in DIV_ROUND_UP_ULL, overflow would happen if bps plus IOC_PAGE_SIZE is greater than ULLONG_MAX, it can cause divide by 0 error. Fix the problem by setting basecost

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 7caa47151ab2e644dd221f741ec7578d9532c9a3 before 9e8bf9f95f7a299fa9ea45b678d001806ad5e12c; 7caa47151ab2e644dd221f741ec7578d9532c9a3 builds before 6e291810fe83a384700eb24a1f714966391ed562; from 7caa47151ab2e644dd221f741ec7578d9532c9a3 before 3538ade9d8c2ba41088e395de916f2599fadba8f; from 7caa47151ab2e644dd221f741ec7578d9532c9a3 before bf8eb1fd6110871e6232e8e7efe399276ef7e6f6; from 7caa47151ab2e644dd221f741ec7578d9532c9a3 before b96d7b4a9745fbd0c8384608ceb1f50415e862fa; from 7caa47151ab2e644dd221f741ec7578d9532c9a3 before 984af1e66b4126cf145153661cc24c213e2ec231	CNA record

References

References

https://git.kernel.org/stable/c/9e8bf9f95f7a299fa9ea45b678d001806ad5e12c
https://git.kernel.org/stable/c/6e291810fe83a384700eb24a1f714966391ed562
https://git.kernel.org/stable/c/3538ade9d8c2ba41088e395de916f2599fadba8f
https://git.kernel.org/stable/c/bf8eb1fd6110871e6232e8e7efe399276ef7e6f6
https://git.kernel.org/stable/c/b96d7b4a9745fbd0c8384608ceb1f50415e862fa
https://git.kernel.org/stable/c/984af1e66b4126cf145153661cc24c213e2ec231

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.