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

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00036.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
7caa47151ab2e644dd221f741ec7578d9532c9a3 affected < 9e8bf9f95f7a299fa9ea45b678d001806ad5e12c
7caa47151ab2e644dd221f741ec7578d9532c9a3 affected < 6e291810fe83a384700eb24a1f714966391ed562
7caa47151ab2e644dd221f741ec7578d9532c9a3 affected < 3538ade9d8c2ba41088e395de916f2599fadba8f
7caa47151ab2e644dd221f741ec7578d9532c9a3 affected < bf8eb1fd6110871e6232e8e7efe399276ef7e6f6
7caa47151ab2e644dd221f741ec7578d9532c9a3 affected < b96d7b4a9745fbd0c8384608ceb1f50415e862fa
7caa47151ab2e644dd221f741ec7578d9532c9a3 affected < 984af1e66b4126cf145153661cc24c213e2ec231
Linux Linux affected
Version Status Constraints
5.4 affected —
0 unaffected < 5.4
5.4.235 unaffected ≤ 5.4.*
5.10.173 unaffected ≤ 5.10.*
5.15.99 unaffected ≤ 5.15.*
6.1.16 unaffected ≤ 6.1.*
6.2.3 unaffected ≤ 6.2.*
6.3 unaffected ≤ *

No data.

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/3538ade9d8c2ba41088e395de916f2599fadba8f cve-icon cve-icon
https://git.kernel.org/stable/c/6e291810fe83a384700eb24a1f714966391ed562 cve-icon cve-icon
https://git.kernel.org/stable/c/984af1e66b4126cf145153661cc24c213e2ec231 cve-icon cve-icon
https://git.kernel.org/stable/c/9e8bf9f95f7a299fa9ea45b678d001806ad5e12c cve-icon cve-icon
https://git.kernel.org/stable/c/b96d7b4a9745fbd0c8384608ceb1f50415e862fa cve-icon cve-icon
https://git.kernel.org/stable/c/bf8eb1fd6110871e6232e8e7efe399276ef7e6f6 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025120939-CVE-2023-53783-4c33@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2023-53783 cve-icon
https://www.cve.org/CVERecord?id=CVE-2023-53783 cve-icon
History

Wed, 10 Dec 2025 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Tue, 09 Dec 2025 00:30:00 +0000

Type Values Removed Values Added
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
Title blk-iocost: fix divide by 0 error in calc_lcoefs()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-12-20T08:51:19.897Z

Reserved: 2025-12-08T23:58:35.272Z

Link: CVE-2023-53783

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-09T01:16:49.547

Modified: 2025-12-09T18:37:13.640

Link: CVE-2023-53783

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-12-09T00:00:00Z

Links: CVE-2023-53783 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.