CVE-2023-53783 Details
Description
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
A divide-by-zero vulnerability has been identified in the Linux kernel's block I/O cost model feature. This issue arises in the 'calc_lcoefs' function, where the cost model can be manipulated to cause a division by zero error. The vulnerability is triggered by writing a maximum unsigned 64-bit integer value to the I/O cost model, which can lead to an overflow condition. The error occurs when the 'calc_lcoefs' function attempts to calculate cost coefficients using the manipulated value, resulting in a division by zero error. This vulnerability affects the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Dec 9, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/3538ade9d8c2ba41088e395de916f2599fadba8f | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/6e291810fe83a384700eb24a1f714966391ed562 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/984af1e66b4126cf145153661cc24c213e2ec231 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/9e8bf9f95f7a299fa9ea45b678d001806ad5e12c | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/b96d7b4a9745fbd0c8384608ceb1f50415e862fa | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/bf8eb1fd6110871e6232e8e7efe399276ef7e6f6 | kernel.org | Source CodeVendor |
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
| Product | Versions |
|---|---|
| Linux kernel | All versions |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Dec 9, 2025 | New CVE Received | kernel.org |